10 beautiful testpositions!!

[Robert Flesher]

finally houdini solve position number 2
Here is the next line of the analysis.

It may be interesting to see result of rybka4 4 cpu for comparison:
33/84+ 2:44:47 50.491.538,048 5.106.000 +1.57 Re1e6

I guess Santa did not upgrade your hardware Uri

I have to say I find comparing Houdini on a slower quad to Rybka on the cluster is rather strange. It's like comparing the SR-71 Blackbird to a Cessna. Yes, obviously, they both fly. However, their top speeds cannot fairly be compared. With that being said, Houdini on a somewhat faster quad (I7 920) finds the solution alot faster.


[d]2bq1b2/1p3k2/1r1p1p1p/pNpP1PpP/P1P3P1/6B1/1P5Q/2K1R3 w - - 0 1

Houdini_15_x64:
4/17 00:00 1,052 0 +1.72 Qh2-e2 Bf8-e7 Kc1-b1 Bc8-d7
5/17 00:00 1,501 0 +1.42 Qh2-e2 Bf8-e7 Kc1-b1 Bc8-d7 Kb1-a2 Bd7xb5 a4xb5
5/17 00:00 2,649 147,000 +1.88 Qh2-d2 Bf8-e7 Qd2xa5 Kf7-f8 Kc1-b1 Bc8-d7
6/23 00:00 5,458 227,000 +1.56 Qh2-d2 Bc8-d7 Qd2xa5 Bd7xb5 a4xb5 Bf8-e7 Qa5-c3 Kf7-g7 Kc1-b1
7/23 00:00 6,903 255,000 +1.56 Qh2-d2 Bc8-d7 Qd2xa5 Bd7xb5 a4xb5 Bf8-e7 Qa5-c3 Kf7-g7 Kc1-b1
8/23 00:00 9,122 285,000 +1.66 Qh2-d2 Bc8-d7 Qd2xa5 Bd7xb5 a4xb5 Bf8-e7 Qa5-c3 Kf7-g8 Kc1-b1
9/23+ 00:00 15,737 425,000 +1.76 Qh2-d2
9/23 00:00 17,191 429,000 +1.77 Qh2-d2 Rb6-a6 Qd2-e3 Bc8-d7 Kc1-b1 Kf7-g7 Kb1-a2 Bd7xb5 a4xb5 Ra6-a8
10/23- 00:00 23,970 510,000 +1.67 Qh2-d2 Rb6-a6
10/23 00:00 37,265 677,000 +1.67 Qh2-d2 Rb6-a6 Qd2-e3 Bc8-d7 Kc1-b1 Kf7-g7 Bg3-h2 Ra6-b6 Kb1-c2 Bd7xb5 a4xb5 a5-a4
11/23 00:00 44,921 761,000 +1.67 Qh2-d2 Rb6-a6 Qd2-e3 Bc8-d7 Kc1-b1 Kf7-g7 Bg3-h2 Ra6-b6 Kb1-c2 Bd7xb5 a4xb5 a5-a4
12/23- 00:00 86,943 1,207,000 +1.56 Qh2-d2 Rb6-a6
12/23- 00:00 151,432 1,781,000 +1.35 Qh2-d2 Rb6-a6
12/24 00:00 196,447 1,907,000 +1.46 b2-b3 Bf8-e7 Kc1-b2 Kf7-f8 Kb2-a2 Kf8-f7 Ka2-a3 Kf7-f8 Qh2-d2 Rb6-a6 Qd2-e2 Bc8-d7 Nb5-c7 Ra6-b6 Nc7-e6+ Bd7xe6 f5xe6 Kf8-g7
13/24- 00:00 242,496 2,127,000 +1.36 b2-b3 Bf8-e7
13/24 00:00 457,671 2,971,000 +1.35 b2-b3 Bf8-e7 Kc1-b2 Kf7-f8 Kb2-a2 Kf8-f7 Ka2-a3 Rb6-a6 Qh2-d2 Bc8-d7 Qd2-e2 Ra6-b6 Ka3-b2 Bd7xb5 a4xb5 Kf7-f8 Qe2-e3 Kf8-f7 Qe3-c3 Qd8-a8 Re1-a1 Kf7-g7 Ra1xa5
13/25 00:00 569,108 3,270,000 +1.36 Kc1-b1 Bf8-e7 Kb1-a2 Rb6-a6 Re1-e3 Kf7-f8 Ka2-b1 Kf8-f7 Kb1-a1 Kf7-f8 Ka1-a2 Kf8-f7 Qh2-d2 Kf7-g7 Qd2-e2 Kg7-f8
14/25 00:00 692,285 3,496,000 +1.35 Kc1-b1 Bf8-e7 Kb1-a2 Rb6-a6 Re1-e3 Kf7-g8 Re3-e4 Kg8-f8 b2-b3 Kf8-f7 Re4-e3 Kf7-f8 Re3-e1 Ra6-b6 Ka2-b2 Rb6-a6 Kb2-a3 Kf8-f7 Qh2-d2 Bc8-d7 Qd2-e2 Ra6-b6 Ka3-b2 Kf7-f8 Qe2-e4 Bd7xb5 a4xb5 Qd8-d7 Re1-a1 Be7-d8 Bg3-e1 Kf8-g7 Be1xa5
15/34 00:00 1,174,458 4,270,000 +1.40 Kc1-b1 Bf8-e7 Kb1-a2 Rb6-a6 Re1-e3 Kf7-g8 b2-b3 Kg8-f7 Ka2-b2 Kf7-f8 Kb2-b1 Kf8-g7 Qh2-e2 Kg7-f8 Bg3-e1 Bc8-d7
16/34 00:00 1,758,849 4,899,000 +1.41 Kc1-b1 Bf8-e7 Kb1-a2 Rb6-a6 Re1-e3 Kf7-g8 b2-b3 Kg8-f7 Ka2-b2 Kf7-f8 Kb2-b1 Kf8-g8 Qh2-e2 Kg8-f8 Bg3-e1 Bc8-d7
17/34 00:00 2,996,535 5,707,000 +1.40 Kc1-b1 Bf8-e7 Kb1-a2 Rb6-a6 Re1-e3 Kf7-g8 b2-b3 Kg8-f7 Ka2-b2 Kf7-f8 Kb2-a3 Kf8-f7 Ka3-a2 Kf7-f8 Ka2-a3 Kf8-f7
18/35 00:00 5,474,428 6,463,000 +1.40 Kc1-b1 Bf8-e7 Kb1-a2 Rb6-a6 Re1-e3 Kf7-g8 b2-b3 Kg8-f7 Ka2-b2 Kf7-g7 Re3-e1 Kg7-f7 Qh2-e2 Ra6-b6 Bg3-h2 Bc8-d7 Qe2-d2 Bd7xb5 a4xb5 Kf7-g7 Qd2xa5
19/46 00:01 10,030,687 6,946,000 +1.43 Kc1-b1 Bf8-e7 Kb1-a2 Rb6-a6 b2-b3 Ra6-b6 Re1-e3 Rb6-a6 Qh2-e2 Ra6-b6 Bg3-e1 Rb6-a6 Be1-c3 Ra6-a8 Qe2-c2 Bc8-d7 Qc2-e4 Kf7-f8 Nb5-c7 Bd7xf5 Qe4xf5 Qd8xc7 Bc3xf6
20/46 00:02 18,550,523 7,364,000 +1.46 Kc1-b1 Bf8-e7 Kb1-a2 Rb6-a6 b2-b3 Be7-f8 Ka2-b2 Bf8-e7 Re1-e3 Kf7-f8 Kb2-a2 Ra6-b6 Re3-e4 Kf8-f7 Re4-e2 Kf7-f8 Re2-e3 Kf8-g7 Qh2-e2 Kg7-f7 Bg3-f2 Rb6-a6 Bf2-e1 Ra6-a8 Be1-g3 Ra8-a6 Ka2-b2 Kf7-f8 Qe2-h2 Kf8-f7 Re3-e1 Qd8-f8 Kb2-a2 Kf7-g7 Nb5-c7 Ra6-b6 Qh2-e2 Be7-d8 Nc7-e6+ Bc8xe6 f5xe6 Rb6-b4 e6-e7
21/56 00:08 69,621,944 7,935,000 +1.43 Kc1-b1 Rb6-a6 Kb1-a2 Kf7-g7 Ka2-a3 Kg7-f7 b2-b3 Kf7-g7 Qh2-d2 Bc8-d7 Qd2-h2 Bd7xb5 c4xb5 Ra6-a8 Re1-e6 Bf8-e7 Bg3xd6 Be7xd6 Qh2xd6 Qd8xd6 Re6xd6 Ra8-f8 Rd6-b6 Rf8-b8 d5-d6 Kg7-f7 d6-d7 Kf7-e7
22/56 00:12 96,529,002 8,018,000 +1.43 Kc1-b1 Rb6-a6 Kb1-a2 Kf7-g7 Ka2-a3 Kg7-f7 b2-b3 Kf7-g7 Ka3-b2 Kg7-f7 Re1-e2 Bf8-e7 Re2-e3 Kf7-f8 Qh2-e2 Kf8-f7 Bg3-e1 Kf7-f8 Be1-c3 b7-b6 Qe2-e1 Ra6-a8 Re3-e2 Qd8-d7 Re2-e6 Qd7-d8
23/56 00:16 134,337,514 8,080,000 +1.43 Kc1-b1 Rb6-a6 Kb1-a2 Kf7-g7 Ka2-a3 Kg7-g8 Ka3-b3 Kg8-f7 Re1-e3 Bf8-e7 Kb3-a2 Ra6-b6 b2-b3 Kf7-f8 Re3-e4 Kf8-g8 Qh2-e2 Kg8-f8 Re4-e3 Rb6-a6 Bg3-e1 Kf8-f7 Ka2-b2 Kf7-f8 Kb2-a2 Kf8-f7
24/56 00:23 192,633,923 8,187,000 +1.43 Kc1-b1 Rb6-a6 Kb1-a2 Kf7-g7 Ka2-a3 Kg7-g8 Ka3-b3 Kg8-f7 Re1-e3 Bf8-e7 Kb3-a2 Ra6-b6 Qh2-e2 Rb6-a6 Bg3-e1 Kf7-f8 Be1-f2 Ra6-a8 Bf2-g3 Ra8-a6 Bg3-e1 Ra6-a8 Ka2-b1 Ra8-a6 Kb1-a2 Ra6-a8
25/56 00:37 311,300,922 8,227,000 +1.43 Kc1-b1 Rb6-a6 Kb1-a2 Kf7-g7 Ka2-a3 Kg7-f7 b2-b3 Kf7-g7 Qh2-e2 Bc8-d7 Nb5-c3 Qd8-b6 Qe2-b2 Qb6-d8 Qb2-h2 Qd8-b6 Nc3-b5 Kg7-f7 Qh2-e2 Kf7-g8 Qe2-c2 Bd7xb5 c4xb5 Ra6-a8 Re1-e6
26/56 00:54 454,482,951 8,291,000 +1.43 Kc1-b1 Rb6-a6 Kb1-a2 Kf7-g7 Ka2-a3 Kg7-f7 b2-b3 Kf7-g7 Ka3-b2 Kg7-f7 Re1-h1 Kf7-g7 Rh1-g1 Kg7-g8 Kb2-a2 Kg8-h8 Qh2-e2 Bc8-d7 Rg1-e1 Kh8-h7 Ka2-a3 Kh7-g7 Nb5-c3 Qd8-b6 Qe2-b2 Qb6-d8 Qb2-h2 Qd8-b6 Nc3-b5 Kg7-f7 Qh2-e2 Kf7-g8 Qe2-c2 Bd7xb5 c4xb5 Ra6-a8 Re1-e6
27/56 01:28 735,785,958 8,351,000 +1.43 Kc1-b1 Rb6-a6 Kb1-a2 Kf7-g7 Ka2-a3 Kg7-f7 b2-b3 Kf7-g7 Ka3-b2 Kg7-f7 Re1-e3 Bf8-e7 Qh2-e2 Kf7-f8 Kb2-a2 Kf8-f7 Bg3-e1 Ra6-a8 Qe2-h2 Ra8-a6 Be1-g3 Be7-f8 Re3-e4 Bf8-e7 Re4-e1 Be7-f8 Re1-e3 Qd8-b6 Bg3-e1 Qb6-d8 Qh2-c2 Bf8-e7 Qc2-e4 Kf7-f8 Re3-e2 Qd8-d7 Ka2-b2 Qd7-d8 Be1-c3 Ra6-a8 Qe4-d3 Kf8-g7
28/56 02:18 1,161,262,314 8,410,000 +1.43 Kc1-b1 Rb6-a6 Kb1-a2 Kf7-g7 Ka2-a3 Kg7-f7 b2-b3 Kf7-g7 Ka3-b2 Kg7-f7 Re1-e3 Bf8-e7 Qh2-e2 Kf7-f8 Kb2-a2 Kf8-f7 Bg3-e1 Kf7-f8 Ka2-a3 Ra6-a8 Be1-g3 Ra8-a6 Bg3-f2 Ra6-b6 Bf2-e1 Rb6-a6 Ka3-b2 Kf8-e8 Be1-c3 Ke8-f7 Qe2-e1 Ra6-a8 Qe1-f1 Kf7-g7
29/59 03:34 1,813,307,700 8,447,000 +1.43 Kc1-b1 Rb6-a6 Kb1-a2 Kf7-g7 Ka2-a3 Kg7-f7 b2-b3 Kf7-g7 Ka3-b2 Kg7-f7 Re1-e3 Bf8-e7 Qh2-e2 Kf7-f8 Kb2-a2 Kf8-f7 Bg3-e1 Ra6-a8 Qe2-h2 Ra8-a6 Be1-g3 Be7-f8 Re3-e4 Kf7-g7 Re4-e2 Kg7-f7 Re2-e1 Qd8-b6 Qh2-e2 Bc8-d7 Nb5-c3 Qb6-d8 Qe2-h2 Bd7-c8 Re1-e3 Bf8-e7 Nc3-b5 Be7-f8
30/62 05:50 2,973,581,000 8,494,000 +1.43 Kc1-b1 Rb6-a6 Kb1-a2 Kf7-g7 Ka2-a3 Kg7-f7 b2-b3 Kf7-g7 Ka3-b2 Kg7-f7 Re1-e3 Bf8-e7 Qh2-e2 Be7-f8 Qe2-c2 Bc8-d7 Qc2-h2 Bd7-c8 Qh2-e2 Bf8-e7 Bg3-e1 Kf7-f8 Qe2-h2 Bc8-d7 Be1-g3 Bd7-c8 Re3-e2 Kf8-f7 Bg3-e1 b7-b6 Re2-e3 Kf7-g8
31/65 10:17 5,269,743,855 8,538,000 +1.43 Kc1-b1 Rb6-a6 Kb1-a2 Kf7-g7 Ka2-a3 Kg7-f7 b2-b3 Kf7-g7 Ka3-b2 Kg7-f7 Re1-e3 Bf8-e7 Qh2-e2 Kf7-f8 Kb2-a2 Kf8-f7 Bg3-e1 Ra6-a8 Qe2-h2 Ra8-a6 Re3-e2 Bc8-d7 Be1-g3 Bd7-c8 Re2-e1 Be7-f8 Ka2-b2 Qd8-b6 Kb2-a1 Bc8-d7 Ka1-a2 Bd7-c8 Qh2-e2 Bc8-d7 Nb5-c3 Qb6-d8 Qe2-h2 Bd7-c8 Re1-e3 Bf8-e7 Nc3-b5 Be7-f8 Re3-e4 Qd8-b6 Ka2-a3 Qb6-d8 Re4-e3 Bf8-e7 Re3-e2 Kf7-f8 Ka3-b2 Kf8-f7 Bg3-e1 b7-b6 Re2-e3 Kf7-g8
32/65 17:25 8,986,524,730 8,591,000 +1.43 Kc1-b1 Rb6-a6 Kb1-a2 Kf7-g7 Ka2-a3 Kg7-f7 b2-b3 Kf7-g7 Ka3-b2 Kg7-f7 Re1-e3 Bf8-e7 Qh2-e2 Kf7-f8 Kb2-a2 Kf8-f7 Bg3-e1 Ra6-a8 Qe2-h2 Ra8-a6 Re3-e2 Bc8-d7 Be1-g3 Bd7-c8 Re2-e1 Kf7-f8 Re1-d1 Kf8-f7 Rd1-f1 Qd8-d7 Qh2-e2 Ra6-b6
33/68 29:53 15,491,611,444 8,639,000 +1.43 Kc1-b1 Rb6-a6 Kb1-a2 Kf7-g7 Ka2-a3 Kg7-f7 b2-b3 Kf7-g7 Ka3-b2 Kg7-f7 Re1-e3 Bf8-e7 Qh2-e2 Be7-f8 Qe2-c2 Bc8-d7 Qc2-h2 Bd7-c8 Kb2-b1 Bf8-e7 Kb1-a2 Be7-f8 Re3-e4 Bf8-e7 Re4-e3 Be7-f8
33/97+ 1:06:49 34,911,519,919 8,707,000 +1.53 Re1-e6

[Uri Blass]

You get faster time than me for some reasons:

33/97+ 1:06:49 34,911,519,919 8,707,000 +1.53 Re1-e6
33/84+ 2:44:47 50.491.538,048 5.106.000 +1.57 Re1e6

1)Your houdini is 64 bits when I use 32 bits so more nodes per seconds.
2)Your hardware is slightly faster(because I believe the speed difference in nodes per second between 64 bits and 32 bits is less than 8707:5106)
3)You probably had some smp luck or maybe bigger hash but I am not sure about the size of your hash when I remember that I used 1024 mbytes hash(the facts are that your computer needed less than 35 billion nodes when my computer needed more than 50 billion nodes).

[Uri Blass]

finally houdini solve position number 2
Here is the next line of the analysis.

It may be interesting to see result of rybka4 4 cpu for comparison:
33/84+ 2:44:47 50.491.538,048 5.106.000 +1.57 Re1e6

Uri, do you think all 10 positions here are relevant for the engine strength? That sort of things happen in less than 1% of the games. Actually, "overtesting" on those things while developing an engine could harm her strength.

Kai

It is possible that an engine is better in test suites and worse in games but it still may be interesting to compare rybka4 with houdini in very hard test positions.

[zullil]

Crafty gets it in less than one hour:

Code: Select all

Crafty v23.4 (16 cpus)

White(1): setboard 2bq1b2/1p3k2/1r1p1p1p/pNpP1PpP/P1P3P1/6B1/1P5Q/2K1R3 w - - 0 1
White(1): hash 2048M
Warning--  xboard 'memory' option disabled
hash table memory = 2048M bytes (128M entries).
White(1): st 10800
search time set to 10800.00.
White(1): display stats
display statistics at end of each search.
White(1): go
              time limit 180:00 (+0.00) (180:00)
              depth   time  score   variation (1)
starting thread 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 <done>
               10     0.08   0.80   1. Na7 Bd7 2. Qc2 Kg7 3. Nb5 Ra6 4.
                                    Qc3 Qb6 5. Kc2 Ra8 (s=8)
               10     0.10   1.10   1. b3 Kg7 2. Re4 Bd7 3. Bxd6 Bxd6 4.
                                    Nxd6 Rxb3 5. Qa2 Rc3+ 6. Kb2 (s=7)
               10->   0.11   1.10   1. b3 Kg7 2. Re4 Bd7 3. Bxd6 Bxd6 4.
                                    Nxd6 Rxb3 5. Qa2 Rc3+ 6. Kb2 (s=2)
               11     0.12   1.07   1. b3 Kg7 2. Re3 Ra6 3. Kc2 Rb6 4.
                                    Be1 Ra6 5. Bc3 Be7 6. Qg3
               11->   0.14   1.07   1. b3 Kg7 2. Re3 Ra6 3. Kc2 Rb6 4.
                                    Be1 Ra6 5. Bc3 Be7 6. Qg3 (s=4)
               12     0.18   1.06   1. b3 Kg7 2. Re3 Ra6 3. Kb2 Rb6 4.
                                    Kc3 Be7 5. Qe2 Kf7 6. Re4 Bd7 (s=3)
               12->   0.20   1.06   1. b3 Kg7 2. Re3 Ra6 3. Kb2 Rb6 4.
                                    Kc3 Be7 5. Qe2 Kf7 6. Re4 Bd7
               13     0.22   1.13   1. b3 Kg7 2. Re3 Ra6 3. Kb2 Rb6 4.
                                    Re4 Ra6 5. Re1 Be7 6. Qe2 Bf8 7. Qf3
               13->   0.23   1.13   1. b3 Kg7 2. Re3 Ra6 3. Kb2 Rb6 4.
                                    Re4 Ra6 5. Re1 Be7 6. Qe2 Bf8 7. Qf3
               14     0.25   1.07   1. b3 Kg7 2. Re3 Ra6 3. Kb2 Rb6 4.
                                    Re4 Ra6 5. Kc2 Kh7 6. Kc3 Kg7 7. Kb2
                                    Kg8 8. Re3 Kg7 9. Qh3
               14->   0.26   1.07   1. b3 Kg7 2. Re3 Ra6 3. Kb2 Rb6 4.
                                    Re4 Ra6 5. Kc2 Kh7 6. Kc3 Kg7 7. Kb2
                                    Kg8 8. Re3 Kg7 9. Qh3 (s=2)
               15     0.28   1.07   1. b3 Kg7 2. Re3 Ra6 3. Kb2 Rb6 4.
                                    Re4 Ra6 5. Kc2 Kh7 6. Kc3 Kg7 7. Kb2
                                    Kg8 8. Re3 Kg7 9. Qh3
               15->   0.31   1.07   1. b3 Kg7 2. Re3 Ra6 3. Kb2 Rb6 4.
                                    Re4 Ra6 5. Kc2 Kh7 6. Kc3 Kg7 7. Kb2
                                    Kg8 8. Re3 Kg7 9. Qh3 (s=4)
               16     0.39   1.07   1. b3 Kg7 2. Re3 Ra6 3. Kb2 Rb6 4.
                                    Re4 Ra6 5. Kc2 Kh7 6. Kc3 Kg7 7. Kb2
                                    Kg8 8. Re3 Kg7 9. Qh3 (s=3)
               16->   0.43   1.07   1. b3 Kg7 2. Re3 Ra6 3. Kb2 Rb6 4.
                                    Re4 Ra6 5. Kc2 Kh7 6. Kc3 Kg7 7. Kb2
                                    Kg8 8. Re3 Kg7 9. Qh3
               17     0.47   1.07   1. b3 Kg7 2. Re3 Ra6 3. Kb2 Rb6 4.
                                    Re4 Ra6 5. Kc2 Kh7 6. Kc3 Kg7 7. Kb2
                                    Kg8 8. Re3 Kg7 9. Qh3
               17->   0.51   1.07   1. b3 Kg7 2. Re3 Ra6 3. Kb2 Rb6 4.
                                    Re4 Ra6 5. Kc2 Kh7 6. Kc3 Kg7 7. Kb2
                                    Kg8 8. Re3 Kg7 9. Qh3 (s=2)
               18     0.59   1.06   1. b3 Kg7 2. Re3 Ra6 3. Kb2 Rb6 4.
                                    Re4 Ra6 5. Kc2 Kh7 6. Re1 Kg7 7. Re3
                                    Rb6 8. Kc3 Be7 9. Qe2 Kf7 10. Re4 Bd7
               18->   0.77   1.06   1. b3 Kg7 2. Re3 Ra6 3. Kb2 Rb6 4.
                                    Re4 Ra6 5. Kc2 Kh7 6. Re1 Kg7 7. Re3
                                    Rb6 8. Kc3 Be7 9. Qe2 Kf7 10. Re4 Bd7
                                    (s=3)
               19     0.87   1.06   1. b3 Kg7 2. Re3 Ra6 3. Kb2 Rb6 4.
                                    Re4 Ra6 5. Kc2 Kh7 6. Re1 Kg7 7. Re3
                                    Rb6 8. Kc3 Be7 9. Qe2 Kf7 10. Re4 Bd7
                                    (s=2)
               19->   1.05   1.06   1. b3 Kg7 2. Re3 Ra6 3. Kb2 Rb6 4.
                                    Re4 Ra6 5. Kc2 Kh7 6. Re1 Kg7 7. Re3
                                    Rb6 8. Kc3 Be7 9. Qe2 Kf7 10. Re4 Bd7
                                    (s=3)
               20     1.22   1.06   1. b3 Kg7 2. Re3 Ra6 3. Kb2 Rb6 4.
                                    Re4 Ra6 5. Kc2 Kh7 6. Re1 Kg7 7. Re3
                                    Rb6 8. Kc3 Be7 9. Qe2 Kf7 10. Re4 Bd7
                                    (s=2)
               20     2.74   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Be1 Qd8 6. b3 Kh7 7. Bc3
                                    Bg7 8. Re2 Qf8 9. Qg3 Kg8 10. Re1 Kh8
               20->   2.91   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Be1 Qd8 6. b3 Kh7 7. Bc3
                                    Bg7 8. Re2 Qf8 9. Qg3 Kg8 10. Re1 Kh8
               21     3.15   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Be1 Qd8 6. b3 Kh7 7. Bc3
                                    Bg7 8. Re2 Bf8 9. Qg3 Be7 10. Qe1 Bf8
                                    11. Qf2
               21->   3.43   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Be1 Qd8 6. b3 Kh7 7. Bc3
                                    Bg7 8. Re2 Bf8 9. Qg3 Be7 10. Qe1 Bf8
                                    11. Qf2 (s=2)
               22     3.98   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Be1 Qd8 6. b3 Kh7 7. Bc3
                                    Bg7 8. Re2 Bf8 9. Qg2 Bg7 10. Qh3 Kh8
                                    11. Qg3 Qf8
               22->   4.65   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Be1 Qd8 6. b3 Kh7 7. Bc3
                                    Bg7 8. Re2 Bf8 9. Qg2 Bg7 10. Qh3 Kh8
                                    11. Qg3 Qf8 (s=2)
               23     5.56   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Be1 Qd8 6. b3 Kh7 7. Bc3
                                    Bg7 8. Re2 Bf8 9. Qg2 Be7 10. Qg3 Qf8
                                    11. Qe1 Bd8 12. Qg3
               23->   7.19   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Be1 Qd8 6. b3 Kh7 7. Bc3
                                    Bg7 8. Re2 Bf8 9. Qg2 Be7 10. Qg3 Qf8
                                    11. Qe1 Bd8 12. Qg3 (s=2)
               24     9.68   1.12   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Be1 Qd8 6. b3 Kh7 7. Bc3
                                    Bg7 8. Re2 Bf8 9. Qg2 Be7 10. Qg3 Qf8
                                    11. Qe1 Bd8 12. Nc7 Rb6
               24->  17.29   1.12   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Be1 Qd8 6. b3 Kh7 7. Bc3
                                    Bg7 8. Re2 Bf8 9. Qg2 Be7 10. Qg3 Qf8
                                    11. Qe1 Bd8 12. Nc7 Rb6 (s=4)
               25    22.97   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Qe2 Qd8 6. b3 Kh8 7. Qh2
                                    Qb8 8. Be1 Qd8 9. Bc3 Bc8 10. Qb2 Bg7
                                    11. Qe2 Bd7 12. Qh2 Bf8 13. Qg3 Be7
                                    14. Qe1 Bf8 15. Qg3 (s=3)
               25->  25.86   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Qe2 Qd8 6. b3 Kh8 7. Qh2
                                    Qb8 8. Be1 Qd8 9. Bc3 Bc8 10. Qb2 Bg7
                                    11. Qe2 Bd7 12. Qh2 Bf8 13. Qg3 Be7
                                    14. Qe1 Bf8 15. Qg3
               26    28.92   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Qe2 Qd8 6. b3 Kh8 7. Qh2
                                    Qb8 8. Be1 Qd8 9. Bc3 Bc8 10. Qb2 Bg7
                                    11. Qe2 Bd7 12. Qh2 Bf8 13. Qg3 Be7
                                    14. Qe1 Bf8 15. Qg3
               26->  32.87   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Qe2 Qd8 6. b3 Kh8 7. Qh2
                                    Qb8 8. Be1 Qd8 9. Bc3 Bc8 10. Qb2 Bg7
                                    11. Qe2 Bd7 12. Qh2 Bf8 13. Qg3 Be7
                                    14. Qe1 Bf8 15. Qg3 (s=3)
               27    39.74   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Qe2 Qd8 6. b3 Kh8 7. Qh2
                                    Qb8 8. Be1 Qd8 9. Bc3 Bc8 10. Qb2 Bg7
                                    11. Qe2 Bd7 12. Qh2 Bf8 13. Qg3 Be7
                                    14. Qe1 Bf8 15. Qg3 (s=2)
               27->  54.21   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Qe2 Qd8 6. b3 Kh8 7. Qh2
                                    Qb8 8. Be1 Qd8 9. Bc3 Bc8 10. Qb2 Bg7
                                    11. Qe2 Bd7 12. Qh2 Bf8 13. Qg3 Be7
                                    14. Qe1 Bf8 15. Qg3 (s=3)
               28     1:02   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Qe2 Qd8 6. b3 Kh8 7. Qh2
                                    Qb8 8. Be1 Qd8 9. Bc3 Bc8 10. Qb2 Bg7
                                    11. Qe2 Bd7 12. Qh2 Bf8 13. Qg3 Be7
                                    14. Qe1 Bf8 15. Qg3 (s=2)
               28->   1:25   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Qe2 Qd8 6. b3 Kh8 7. Qh2
                                    Qb8 8. Be1 Qd8 9. Bc3 Bc8 10. Qb2 Bg7
                                    11. Qe2 Bd7 12. Qh2 Bf8 13. Qg3 Be7
                                    14. Qe1 Bf8 15. Qg3 (s=2)
               29     1:37   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Qe2 Qd8 6. b3 Kh8 7. Qh2
                                    Qb8 8. Be1 Qd8 9. Bc3 Bc8 10. Qb2 Bg7
                                    11. Qe2 Bd7 12. Qh2 Bf8 13. Qg3 Be7
                                    14. Qe1 Bf8 15. Qg3
               29->   2:27   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Qe2 Qd8 6. b3 Kh8 7. Qh2
                                    Qb8 8. Be1 Qd8 9. Bc3 Bc8 10. Qb2 Bg7
                                    11. Qe2 Bd7 12. Qh2 Bf8 13. Qg3 Be7
                                    14. Qe1 Bf8 15. Qg3 (s=3)
               30     4:09   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Qe2 Qd8 6. b3 Kh8 7. Qh2
                                    Qb8 8. Be1 Qd8 9. Bc3 Bc8 10. Qb2 Bg7
                                    11. Qe2 Bd7 12. Qh2 Bf8 13. Qg2 Bg7
                                    14. Qg3 Bf8 15. Qh2 Bc8 16. Qb2 Bg7
                                    17. Qe2 Bd7 18. Qh2 Bf8 19. Qg3 Be7
                                    20. Qe1 Bf8 21. Qg3 (s=2)
               30->   5:15   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Qe2 Qd8 6. b3 Kh8 7. Qh2
                                    Qb8 8. Be1 Qd8 9. Bc3 Bc8 10. Qb2 Bg7
                                    11. Qe2 Bd7 12. Qh2 Bf8 13. Qg2 Bg7
                                    14. Qg3 Bf8 15. Qh2 Bc8 16. Qb2 Bg7
                                    17. Qe2 Bd7 18. Qh2 Bf8 19. Qg3 Be7
                                    20. Qe1 Bf8 21. Qg3
               31     6:18   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Qe2 Qd8 6. b3 Kh8 7. Qh2
                                    Qb8 8. Be1 Qd8 9. Bc3 Bc8 10. Qb2 Bg7
                                    11. Qe2 Bd7 12. Qh2 Bf8 13. Qg3 Be7
                                    14. Qe1 Bf8 15. Qf2 Bg7 16. Qh2 Bf8
                                    17. Qg3 Be7 18. Qe1 Bf8 19. Qg3
               31->   7:39   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Qe2 Qd8 6. b3 Kh8 7. Qh2
                                    Qb8 8. Be1 Qd8 9. Bc3 Bc8 10. Qb2 Bg7
                                    11. Qe2 Bd7 12. Qh2 Bf8 13. Qg3 Be7
                                    14. Qe1 Bf8 15. Qf2 Bg7 16. Qh2 Bf8
                                    17. Qg3 Be7 18. Qe1 Bf8 19. Qg3 (s=3)
               32    14:36   1.13   1. Kd2 Kg7 2. Ke3 Bd7 3. Kf3 Qb8 4.
                                    Re4 Ra6 5. Qe2 Qd8 6. b3 Kh8 7. Qh2
                                    Qb8 8. Be1 Qd8 9. Bc3 Kg7 10. Qb2 Ra8
                                    11. Qg2 Ra6 12. Qf2 Kh7 13. Qg3 Bc8
                                    14. Re3 Bd7 15. Re1 Be7 16. Re2 Bf8
                                    17. Re4 Kg8 18. Bb2 Kh8 19. Bc3 (s=2)
               32    50:58     +1   1. Re6!                           
               32    75:05   2.45   1. Re6 Bxe6 2. fxe6+ Kg8 3. Be1 Ra6
                                    4. Qc2 Qe7 5. Qg6+ Bg7 6. Nc3 Ra8 7.
                                    Ne4 b6 8. Ng3 Qe8 9. Nf5 Qxg6 10. hxg6
                                    Kh8 11. Nxd6 Bf8 12. Nf5 Re8 13. Kc2
                                    Bg7 14. Bc3 Ra8 15. d6 Rb8 16. Kd3
                                    Re8 17. Nxg7 Kxg7
               32->  79:42   2.45   1. Re6 Bxe6 2. fxe6+ Kg8 3. Be1 Ra6
                                    4. Qc2 Qe7 5. Qg6+ Bg7 6. Nc3 Ra8 7.
                                    Ne4 b6 8. Ng3 Qe8 9. Nf5 Qxg6 10. hxg6
                                    Kh8 11. Nxd6 Bf8 12. Nf5 Re8 13. Kc2
                                    Bg7 14. Bc3 Ra8 15. d6 Rb8 16. Kd3
                                    Re8 17. Nxg7 Kxg7
?              33    81:46   1/37*  1. Re6     (22.5Mnps)             
Black(1): ?
              time=81:58  mat=0  n=110355537345  fh=924%  nps=22.4M
              extensions=4149.2M qchecks=1454.4M reduced=2901.5M pruned=2560.9M
              predicted=0  evals=2343.5M  50move=0  EGTBprobes=470  hits=470
              SMP->  splits=12867499  aborts=2435430  data=233/1024  elap=81:58
terminating SMP processes.
White(1): Re6
              time used:  81:58

[Robert Flesher]

You get faster time than me for some reasons:

33/97+ 1:06:49 34,911,519,919 8,707,000 +1.53 Re1-e6
33/84+ 2:44:47 50.491.538,048 5.106.000 +1.57 Re1e6

1)Your houdini is 64 bits when I use 32 bits so more nodes per seconds.
2)Your hardware is slightly faster(because I believe the speed difference in nodes per second between 64 bits and 32 bits is less than 8707:5106)
3)You probably had some smp luck or maybe bigger hash but I am not sure about the size of your hash when I remember that I used 1024 mbytes hash(the facts are that your computer needed less than 35 billion nodes when my computer needed more than 50 billion nodes).

I'll try in now with 8 threads. We'll see what occurs!

[zullil]

•Play 1.Rc6!! that is the only move that draws.
Very tough for computers i think.
[d]2K3k1/1p6/R3p1p1/1rB1P1P1/8/8/1Pb5/8 w - - 0 1

Crafty plays Rc6, but doesn't (yet) see a draw:

Code: Select all

Crafty v23.4 (16 cpus)

White(1): setboard 2K3k1/1p6/R3p1p1/1rB1P1P1/8/8/1Pb5/8 w - - 0 1
White(1): st 3600
search time set to 3600.00.
White(1): display stats
display statistics at end of each search.
White(1): go
              time limit 60:00 (+0.00) (60:00)
              depth   time  score   variation (1)
starting thread 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 <done>
               12     0.11  -4.08   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. b4 Rxe5
                                    4. Ra7 Rxg5 5. b5 Kf6 6. b6 Rc5 7.
                                    Ka8 Rc8+ 8. Kb7
               12     0.14  -3.88   1. Rb6 Rxc5+ 2. Kd7 Rxe5 3. Rxb7 Rxg5
                                    4. Kxe6 Bf5+ 5. Kf6 Rg2 6. b4 Re2 7.
                                    Rg7+ Kf8 8. Rf7+ Ke8
               12->   0.14  -3.88   1. Rb6 Rxc5+ 2. Kd7 Rxe5 3. Rxb7 Rxg5
                                    4. Kxe6 Bf5+ 5. Kf6 Rg2 6. b4 Re2 7.
                                    Rg7+ Kf8 8. Rf7+ Ke8 (s=2)
               13     0.16  -3.92   1. Rb6 Rxc5+ 2. Kd7 Rxe5 3. Rxb7 Rxg5
                                    4. Kxe6 Rg2 5. b4 Re2+ 6. Kf6 Rf2+
                                    7. Ke5 g5 8. Rd7 g4
               13->   0.18  -3.92   1. Rb6 Rxc5+ 2. Kd7 Rxe5 3. Rxb7 Rxg5
                                    4. Kxe6 Rg2 5. b4 Re2+ 6. Kf6 Rf2+
                                    7. Ke5 g5 8. Rd7 g4 (s=2)
               14     0.23     -1   1. Rb6?                          
               14     0.27  -4.51   1. Rb6 Rxc5+ 2. Kd7 Rxe5 3. Rxb7 Be4
                                    4. Rb4 Kf7 5. Kd6 Rd5+ 6. Kc6 Rd4+
                                    7. Kc5 Rxb4 8. Kxb4 e5
               14     0.35  -4.03   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Kf8
                                    4. Ra8+ Ke7 5. Ra7 Ke8 6. b4 Rxe5 7.
                                    Kc6 Rxg5 8. Kd6 Rb5 9. Re7+ Kf8 10.
                                    Rc7
               14->   0.37  -4.03   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Kf8
                                    4. Ra8+ Ke7 5. Ra7 Ke8 6. b4 Rxe5 7.
                                    Kc6 Rxg5 8. Kd6 Rb5 9. Re7+ Kf8 10.
                                    Rc7 (s=2)
               15     0.45  -4.06   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Ke7 8. Kc4 e4 9. b4 Bd3+ 10.
                                    Kd4
               15->   0.49  -4.06   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Ke7 8. Kc4 e4 9. b4 Bd3+ 10.
                                    Kd4
               16     0.54  -4.23   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Ke7 8. Kc4 e4 9. b4 e3
               16->   0.64  -4.23   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Ke7 8. Kc4 e4 9. b4 e3 (s=4)
               17     0.71  -4.29   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Kd7 8. Kc3 Bf5 9. b4 Kc6 10.
                                    Kc4 Be6+ 11. Kd3 (s=3)
               17->   0.88  -4.29   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Kd7 8. Kc3 Bf5 9. b4 Kc6 10.
                                    Kc4 Be6+ 11. Kd3 (s=2)
               18     1.06  -4.29   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Kd7 8. Kc3 Bf5 9. b4 Kc6 10.
                                    Kc4 Be6+ 11. Kd3
               18->   1.17  -4.29   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Kd7 8. Kc3 Bf5 9. b4 Kc6 10.
                                    Kc4 Be6+ 11. Kd3
               19     1.40  -4.30   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Kd7 8. Kc3 Be4 9. b4 Kc6 10.
                                    Kc4 Bd5+ 11. Kd3 e4+ 12. Ke3
               19->   1.54  -4.30   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Kd7 8. Kc3 Be4 9. b4 Kc6 10.
                                    Kc4 Bd5+ 11. Kd3 e4+ 12. Ke3
               20     1.96  -4.37   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Kd7 8. Kc3 Be4 9. b4 Kc6 10.
                                    Kc4 Bd5+ 11. Kd3 Kb5 12. Kc3
               20->   2.14  -4.37   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Kd7 8. Kc3 Be4 9. b4 Kc6 10.
                                    Kc4 Bd5+ 11. Kd3 Kb5 12. Kc3
               21     2.64  -4.45   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Kd7 8. Kc5 e4 9. Kd4 Kd6 10.
                                    b4 Kc6 11. Ke3 Bd3 12. Kd4
               21->   2.96  -4.45   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Kd7 8. Kc5 e4 9. Kd4 Kd6 10.
                                    b4 Kc6 11. Ke3 Bd3 12. Kd4
               22     3.80  -4.47   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Bb3 6. Rc8+ Kd7
                                    7. Rc7+ Kd8 8. Rc3 Bd5 9. Rg3 Kd7 10.
                                    Kb5 Kd6 11. b4 Re2 12. Kb6 Ra2 13.
                                    Rc3 Rb2
               22->   4.16  -4.47   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Bb3 6. Rc8+ Kd7
                                    7. Rc7+ Kd8 8. Rc3 Bd5 9. Rg3 Kd7 10.
                                    Kb5 Kd6 11. b4 Re2 12. Kb6 Ra2 13.
                                    Rc3 Rb2
               23     5.16  -4.49   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Bb3 6. Rc8+ Kd7
                                    7. Rc7+ Kd8 8. Rc3 Bd5 9. Rg3 Kd7 10.
                                    Rg4 Re2 11. b4 e5 12. b5 Rc2 13. Rh4
                                    Kd6 14. Rh7
               23->   5.78  -4.49   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Bb3 6. Rc8+ Kd7
                                    7. Rc7+ Kd8 8. Rc3 Bd5 9. Rg3 Kd7 10.
                                    Rg4 Re2 11. b4 e5 12. b5 Rc2 13. Rh4
                                    Kd6 14. Rh7
               24     6.96  -4.49   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Bb3 6. Rc8+ Kd7
                                    7. Rc7+ Kd8 8. Rc3 Bd5 9. Rg3 Kd7 10.
                                    Rg4 Re2 11. b4 e5 12. Rh4 Rc2 13. Rh7+
                                    Kd6 14. Ra7 Rc6+ 15. Kb5 Bc4+ 16. Ka5
               24->   7.97  -4.49   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Bb3 6. Rc8+ Kd7
                                    7. Rc7+ Kd8 8. Rc3 Bd5 9. Rg3 Kd7 10.
                                    Rg4 Re2 11. b4 e5 12. Rh4 Rc2 13. Rh7+
                                    Kd6 14. Ra7 Rc6+ 15. Kb5 Bc4+ 16. Ka5
               25    10.93  -4.66   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc4 Bf3 7.
                                    Rc3 Bd5 8. Rg3 Kd7 9. Rg4 Bf3 10. Rf4
                                    Be2 11. Rd4+ Ke7 12. Rd2 Bf3 13. Rd3
                                    Bd5 14. Rg3 Kd6
               25->  12.70  -4.66   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc4 Bf3 7.
                                    Rc3 Bd5 8. Rg3 Kd7 9. Rg4 Bf3 10. Rf4
                                    Be2 11. Rd4+ Ke7 12. Rd2 Bf3 13. Rd3
                                    Bd5 14. Rg3 Kd6
               26    18.93  -5.00   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc5 Bd5 7.
                                    Kc7 Rxg5 8. b4 Rg2 9. b5 Rb2 10. b6
                                    g5 11. Rc1 g4 12. Rg1 Rc2+ 13. Kb8
                                    Rg2 14. Rf1 Rb2 15. Kc7
               26->  23.66  -5.00   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc5 Bd5 7.
                                    Kc7 Rxg5 8. b4 Rg2 9. b5 Rb2 10. b6
                                    g5 11. Rc1 g4 12. Rg1 Rc2+ 13. Kb8
                                    Rg2 14. Rf1 Rb2 15. Kc7
               27    30.55     -1   1. Ra8?                           
               27    33.04  -5.40   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc5 Bd5 7.
                                    Rc7 Rxg5 8. b4 Rg2 9. b5 g5 10. Rc1
                                    Kd7 11. Kc5 g4 12. b6 Rb2 13. Rc3 Bb7
                                    14. Rd3+ Ke7 15. Rg3 Rc2+ 16. Kd4
               27->  40.82  -5.40   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc5 Bd5 7.
                                    Rc7 Rxg5 8. b4 Rg2 9. b5 g5 10. Rc1
                                    Kd7 11. Kc5 g4 12. b6 Rb2 13. Rc3 Bb7
                                    14. Rd3+ Ke7 15. Rg3 Rc2+ 16. Kd4 (s=3)
               28    51.02  -5.44   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. b4 Rxe5 5. Kc6 Rxg5 6. Kd6 Rb5 7.
                                    Kxe6 Rb6+ 8. Ke5 Rxb4 9. Rc7 Rb5+ 10.
                                    Ke6 Rb6+ 11. Ke5 Bf5 12. Kf4 Re6 13.
                                    Kg5 Re7 14. Rc5 Kd7 15. Rd5+ Ke6 16.
                                    Rd8 Ke5 17. Rd2 Rc7 (s=2)
               28->   1:02  -5.44   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. b4 Rxe5 5. Kc6 Rxg5 6. Kd6 Rb5 7.
                                    Kxe6 Rb6+ 8. Ke5 Rxb4 9. Rc7 Rb5+ 10.
                                    Ke6 Rb6+ 11. Ke5 Bf5 12. Kf4 Re6 13.
                                    Kg5 Re7 14. Rc5 Kd7 15. Rd5+ Ke6 16.
                                    Rd8 Ke5 17. Rd2 Rc7 (s=2)
               29     1:19  -5.45   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. b4 Rxe5 5. Kc6 Rxg5 6. Kd6 Rb5 7.
                                    Kxe6 Rb6+ 8. Ke5 Rxb4 9. Rc7 Rb5+ 10.
                                    Ke6 Rb6+ 11. Ke5 Bf5 12. Kf4 Re6 13.
                                    Kg5 Re7 14. Rc5 Kd7 15. Rc4 Re2 16.
                                    Kf6 Be4 17. Rd4+ Ke8 18. Kg5
               29->   1:27  -5.45   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. b4 Rxe5 5. Kc6 Rxg5 6. Kd6 Rb5 7.
                                    Kxe6 Rb6+ 8. Ke5 Rxb4 9. Rc7 Rb5+ 10.
                                    Ke6 Rb6+ 11. Ke5 Bf5 12. Kf4 Re6 13.
                                    Kg5 Re7 14. Rc5 Kd7 15. Rc4 Re2 16.
                                    Kf6 Be4 17. Rd4+ Ke8 18. Kg5
               30     2:14  -5.45   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. b4 Rxe5 5. Kc6 Rxg5 6. Kd6 Rb5 7.
                                    Kxe6 Rb6+ 8. Ke5 Rxb4 9. Rc7 Rb5+ 10.
                                    Ke6 Rb6+ 11. Ke5 Bf5 12. Kf4 Re6 13.
                                    Rh7 Re7 14. Rh2 Kd7 15. Rf2 Re4+ 16.
                                    Kg5 Kd6 17. Rh2 Re1 18. Rf2 Kd5 19.
                                    Rd2+ Ke4
               30->   2:27  -5.45   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. b4 Rxe5 5. Kc6 Rxg5 6. Kd6 Rb5 7.
                                    Kxe6 Rb6+ 8. Ke5 Rxb4 9. Rc7 Rb5+ 10.
                                    Ke6 Rb6+ 11. Ke5 Bf5 12. Kf4 Re6 13.
                                    Rh7 Re7 14. Rh2 Kd7 15. Rf2 Re4+ 16.
                                    Kg5 Kd6 17. Rh2 Re1 18. Rf2 Kd5 19.
                                    Rd2+ Ke4
               31     3:15  -5.46   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. b4 Rxe5 5. Kc6 Rxg5 6. Kd6 Rb5 7.
                                    Kxe6 Rb6+ 8. Ke5 Rxb4 9. Rc7 Rb5+ 10.
                                    Kf6 Rf5+ 11. Kg7 Be4 12. Rc4 Rf4 13.
                                    Rc7 Rf2 14. Kh6 Rf5 15. Kg7 g5 16.
                                    Rc4 Bd3 17. Rc8+ Kd7 18. Rc3 Be2 19.
                                    Kg6
               31->   3:37  -5.46   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. b4 Rxe5 5. Kc6 Rxg5 6. Kd6 Rb5 7.
                                    Kxe6 Rb6+ 8. Ke5 Rxb4 9. Rc7 Rb5+ 10.
                                    Kf6 Rf5+ 11. Kg7 Be4 12. Rc4 Rf4 13.
                                    Rc7 Rf2 14. Kh6 Rf5 15. Kg7 g5 16.
                                    Rc4 Bd3 17. Rc8+ Kd7 18. Rc3 Be2 19.
                                    Kg6
               32     4:46     -1   1. Ra8?                           
               32     6:08  -5.90   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. b4 Be4+ 5. Kb6 Rxe5 6. Ra3 Rxg5
                                    7. Re3 Bd5 8. Kc7 Rg2 9. Kd6 Rb2 10.
                                    Rg3 Rxb4 11. Rxg6 Kf7 12. Rh6 Rb2 13.
                                    Rh8 Kf6 14. Rf8+ Kg5 15. Rf7 Kg4 16.
                                    Rg7+ Kf4 17. Rf7+ Ke4 18. Rd7 Rc2 19.
                                    Ke7 Kd3
               32->  10:36  -5.90   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. b4 Be4+ 5. Kb6 Rxe5 6. Ra3 Rxg5
                                    7. Re3 Bd5 8. Kc7 Rg2 9. Kd6 Rb2 10.
                                    Rg3 Rxb4 11. Rxg6 Kf7 12. Rh6 Rb2 13.
                                    Rh8 Kf6 14. Rf8+ Kg5 15. Rf7 Kg4 16.
                                    Rg7+ Kf4 17. Rf7+ Ke4 18. Rd7 Rc2 19.
                                    Ke7 Kd3 (s=3)
               33    14:17     -1   1. Ra8?                           
               33    20:07  -6.31   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb8 Be4 5. Rh7 Kd8 6. Rh8+ Kd7 7.
                                    Rh7+ Kc6 8. Kc8 Kd5+ 9. Kd7 Kxe5 10.
                                    Rh8 Bc6+ 11. Ke7 Rb5 12. Kf7 Kf5 13.
                                    Ke7 Rxb2 14. Rf8+ Kxg5 15. Kxe6 Bd7+
                                    16. Ke7 Re2+ 17. Kd6 Bh3 18. Rf7 Bf5
                                    19. Rh7 Kf6 20. Kc5 Rd2 21. Rb7 (s=2)
               33    39:10  -6.01   1. Rc6 bxc6 2. b4 Kf7 3. Kd7 Be4 4.
                                    Kc7 Bd5 5. Bd6 Kg7 6. Bc5 Bh1 7. Kd7
                                    Bg2 8. Kc7 Bd5 <HT>           
               33->  39:10  -6.01   1. Rc6 bxc6 2. b4 Kf7 3. Kd7 Be4 4.
                                    Kc7 Bd5 5. Bd6 Kg7 6. Bc5 Bh1 7. Kd7
                                    Bg2 8. Kc7 Bd5 <HT>            (s=6)
               34    39:41  -6.01   1. Rc6 bxc6 2. b4 Kf7 3. Kd7 Be4 4.
                                    Kc7 Bd5 5. Bd6 Kg7 6. Be7 Bf3 7. Bc5
                                    Kf7 <HT>            (s=5)
               34->  46:10  -6.01   1. Rc6 bxc6 2. b4 Kf7 3. Kd7 Be4 4.
                                    Kc7 Bd5 5. Bd6 Kg7 6. Be7 Bf3 7. Bc5
                                    Kf7 <HT>            (s=7)
               35    49:00  -6.01   1. Rc6 bxc6 2. b4 Kf7 3. Kd7 Be4 4.
                                    Kc7 Bd5 5. Bd6 Kg7 6. Be7 Bg2 7. Bc5
                                    Bh1 <HT>            (s=6)
              time=60:00  mat=0  n=92030387247  fh=776%  nps=25.6M    
              extensions=3223.4M qchecks=2558.8M reduced=4010.3M pruned=22.3M
              predicted=0  evals=1776.2M  50move=0  EGTBprobes=34.0M  hits=34.0M
              SMP->  splits=11165285  aborts=2265364  data=244/1024  elap=60:00
terminating SMP processes.
White(1): Rc6
              time used:  60:00

[zullil]

And even faster with 2GB hash:

Code: Select all

Crafty v23.4 (16 cpus)

White(1): hash=2048M
Warning--  xboard 'memory' option disabled
hash table memory = 2048M bytes (128M entries).
White(1): setboard 2K3k1/1p6/R3p1p1/1rB1P1P1/8/8/1Pb5/8 w - - 0 1
White(1): st 3600
search time set to 3600.00.
White(1): display stats
display statistics at end of each search.
White(1): go
              time limit 60:00 (+0.00) (60:00)
              depth   time  score   variation (1)
starting thread 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 <done>
               12     0.10  -4.08   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. b4 Rxe5
                                    4. Ra7 Rxg5 5. b5 Kf6 6. b6 Rc5 7.
                                    Ka8 Rc8+ 8. Kb7
               12     0.15  -3.88   1. Rb6 Rxc5+ 2. Kd7 Rxe5 3. Rxb7 Rxg5
                                    4. Kxe6 Bf5+ 5. Kf6 Rg2 6. b4 Re2 7.
                                    Rg7+ Kf8 8. Rf7+ Ke8
               12->   0.16  -3.88   1. Rb6 Rxc5+ 2. Kd7 Rxe5 3. Rxb7 Rxg5
                                    4. Kxe6 Bf5+ 5. Kf6 Rg2 6. b4 Re2 7.
                                    Rg7+ Kf8 8. Rf7+ Ke8 (s=2)
               13     0.18  -3.92   1. Rb6 Rxc5+ 2. Kd7 Rxe5 3. Rxb7 Rxg5
                                    4. Kxe6 Rg2 5. b4 Re2+ 6. Kf6 Rf2+
                                    7. Ke5 g5 8. Rd7 g4
               13->   0.20  -3.92   1. Rb6 Rxc5+ 2. Kd7 Rxe5 3. Rxb7 Rxg5
                                    4. Kxe6 Rg2 5. b4 Re2+ 6. Kf6 Rf2+
                                    7. Ke5 g5 8. Rd7 g4 (s=2)
               14     0.24     -1   1. Rb6?                          
               14     0.29  -4.51   1. Rb6 Rxc5+ 2. Kd7 Rxe5 3. Rxb7 Be4
                                    4. Rb4 Kf7 5. Kd6 Rd5+ 6. Kc6 Rd4+
                                    7. Kc5 Rxb4 8. Kxb4 e5
               14     0.36  -4.03   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Kf8
                                    4. Ra8+ Ke7 5. Ra7 Ke8 6. b4 Rxe5 7.
                                    Kc6 Rxg5 8. Kd6 Rb5 9. Re7+ Kf8 10.
                                    Rc7
               14->   0.39  -4.03   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Kf8
                                    4. Ra8+ Ke7 5. Ra7 Ke8 6. b4 Rxe5 7.
                                    Kc6 Rxg5 8. Kd6 Rb5 9. Re7+ Kf8 10.
                                    Rc7 (s=2)
               15     0.47  -4.06   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Ke7 8. Kc4 e4 9. b4 Bd3+ 10.
                                    Kd4
               15->   0.51  -4.06   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Ke7 8. Kc4 e4 9. b4 Bd3+ 10.
                                    Kd4
               16     0.56  -4.23   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Ke7 8. Kc4 e4 9. b4 e3
               16->   0.65  -4.23   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Ke7 8. Kc4 e4 9. b4 e3 (s=4)
               17     0.72  -4.29   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Kd7 8. Kc3 Bf5 9. b4 Kc6 10.
                                    Kc4 Be6+ 11. Kd3 (s=3)
               17->   0.88  -4.29   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Kd7 8. Kc3 Bf5 9. b4 Kc6 10.
                                    Kc4 Be6+ 11. Kd3 (s=2)
               18     1.09  -4.29   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Kd7 8. Kc3 Bf5 9. b4 Kc6 10.
                                    Kc4 Be6+ 11. Kd3
               18->   1.23  -4.29   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Kd7 8. Kc3 Bf5 9. b4 Kc6 10.
                                    Kc4 Be6+ 11. Kd3
               19     1.41  -4.30   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Kd7 8. Kc3 Be4 9. b4 Kc6 10.
                                    Kc4 Bd5+ 11. Kd3 e4+ 12. Ke3
               19->   1.56  -4.30   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Kd7 8. Kc3 Be4 9. b4 Kc6 10.
                                    Kc4 Bd5+ 11. Kd3 e4+ 12. Ke3
               20     1.90  -4.37   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Kd7 8. Kc3 Be4 9. b4 Kc6 10.
                                    Kc4 Bd5+ 11. Kd3 Kb5 12. Kc3
               20->   2.09  -4.37   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Ra5 Rxa5 6. Kxa5 e5
                                    7. Kb4 Kd7 8. Kc3 Be4 9. b4 Kc6 10.
                                    Kc4 Bd5+ 11. Kd3 Kb5 12. Kc3
               21     2.74  -4.40   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. b4 Be4+ 5. Kb6 Rxe5 6. Ra5 Bd5 7.
                                    Kc5 Rxg5 8. b5 Rg2 9. b6 Rc2+ 10. Kd4
                                    Rb2 11. Kc5 g5 12. Ra7 Rc2+ 13. Kd4
                                    g4
               21->   3.08  -4.40   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. b4 Be4+ 5. Kb6 Rxe5 6. Ra5 Bd5 7.
                                    Kc5 Rxg5 8. b5 Rg2 9. b6 Rc2+ 10. Kd4
                                    Rb2 11. Kc5 g5 12. Ra7 Rc2+ 13. Kd4
                                    g4
               22     3.91  -4.46   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Bb3 6. Rc8+ Kd7
                                    7. Rc7+ Kd8 8. Rc3 Bd5 9. Rg3 Kd7 10.
                                    Kc5 Bc6+ 11. Kc4 Rd5 12. b4 Bb5+ 13.
                                    Kb3 Kc6 14. Re3 e5 15. Rc3+ Kd6
               22->   4.29  -4.46   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Bb3 6. Rc8+ Kd7
                                    7. Rc7+ Kd8 8. Rc3 Bd5 9. Rg3 Kd7 10.
                                    Kc5 Bc6+ 11. Kc4 Rd5 12. b4 Bb5+ 13.
                                    Kb3 Kc6 14. Re3 e5 15. Rc3+ Kd6
               23     5.08  -4.46   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Bb3 6. Rc8+ Kd7
                                    7. Rc7+ Kd8 8. Rc3 Bd5 9. Rg3 Kd7 10.
                                    Kc5 Bc6+ 11. Kc4 Rd5 12. b4 Bb5+ 13.
                                    Kb3 Kc6 14. Re3 e5 15. Rc3+ Kd6
               23->   5.68  -4.46   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Bb3 6. Rc8+ Kd7
                                    7. Rc7+ Kd8 8. Rc3 Bd5 9. Rg3 Kd7 10.
                                    Kc5 Bc6+ 11. Kc4 Rd5 12. b4 Bb5+ 13.
                                    Kb3 Kc6 14. Re3 e5 15. Rc3+ Kd6
               24     7.11  -4.47   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Bb3 6. Rc3 Bd5 7.
                                    Rg3 Kd7 8. Kc5 Bc6+ 9. Kc4 Rd5 10.
                                    b4 Bb5+ 11. Kb3 Kc6 12. Kc2 Kd6 13.
                                    Kc3 Rf5 14. Rg2 Rf3+ 15. Kd4 Rf4+ 16.
                                    Kc3
               24->   8.03  -4.47   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Bb3 6. Rc3 Bd5 7.
                                    Rg3 Kd7 8. Kc5 Bc6+ 9. Kc4 Rd5 10.
                                    b4 Bb5+ 11. Kb3 Kc6 12. Kc2 Kd6 13.
                                    Kc3 Rf5 14. Rg2 Rf3+ 15. Kd4 Rf4+ 16.
                                    Kc3
               25    10.38  -4.56   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Bb3 6. Rc3 Bd5 7.
                                    Rg3 Kd7 8. Kc5 Bc6+ 9. Kc4 Rd5 10.
                                    b4 Bb5+ 11. Kb3 Kc6 12. Kc3 Kd6 13.
                                    Kc2 e5 14. Rg2 Bd3+ 15. Kc3 Bb5
               25->  12.06  -4.56   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Bb3 6. Rc3 Bd5 7.
                                    Rg3 Kd7 8. Kc5 Bc6+ 9. Kc4 Rd5 10.
                                    b4 Bb5+ 11. Kb3 Kc6 12. Kc3 Kd6 13.
                                    Kc2 e5 14. Rg2 Bd3+ 15. Kc3 Bb5
               26    16.94  -4.87   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc4 Kd7 7.
                                    b4 Bf3 8. Rf4 Bh5 9. Rd4+ Ke7 10. Rd2
                                    Rxg5 11. b5 Bf3 12. Rc2 Rd5 13. Ka6
                                    Rd7 14. b6 Bb7+ 15. Kb5 g5
               26->  19.85  -4.87   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc4 Kd7 7.
                                    b4 Bf3 8. Rf4 Bh5 9. Rd4+ Ke7 10. Rd2
                                    Rxg5 11. b5 Bf3 12. Rc2 Rd5 13. Ka6
                                    Rd7 14. b6 Bb7+ 15. Kb5 g5
               27    26.05  -5.05   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc4 Kd7 7.
                                    b4 Bf3 8. Rf4 Be2 9. Rd4+ Ke7 10. Rd2
                                    Bc4 11. Rd4 Rb5+ 12. Kc7 Rxb4 13. Rd7+
                                    Ke8 14. Rd8+ Kf7 15. Rd7+ Kg8 16. Rd8+
                                    Kg7 17. Rd7+ Kh8 18. Rd8+ Kh7 19. Rd7+
                                    Kg8 20. Rd8+ Kf7 21. Rd7+ Ke8
               27->  30.00  -5.05   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc4 Kd7 7.
                                    b4 Bf3 8. Rf4 Be2 9. Rd4+ Ke7 10. Rd2
                                    Bc4 11. Rd4 Rb5+ 12. Kc7 Rxb4 13. Rd7+
                                    Ke8 14. Rd8+ Kf7 15. Rd7+ Kg8 16. Rd8+
                                    Kg7 17. Rd7+ Kh8 18. Rd8+ Kh7 19. Rd7+
                                    Kg8 20. Rd8+ Kf7 21. Rd7+ Ke8
               28    33.91  -5.05   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc4 Kd7 7.
                                    b4 Bf3 8. Rf4 Be2 9. Rd4+ Ke7 10. Rd2
                                    Bc4 11. Rd4 Rb5+ 12. Kc6 Rxb4 13. Kc5
                                    Ra4 14. Rh4 Bb3 15. Rh7+ Kf8 16. Kd6
                                    Rd4+ 17. Ke5 Rd2
               28->  37.25  -5.05   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc4 Kd7 7.
                                    b4 Bf3 8. Rf4 Be2 9. Rd4+ Ke7 10. Rd2
                                    Bc4 11. Rd4 Rb5+ 12. Kc6 Rxb4 13. Kc5
                                    Ra4 14. Rh4 Bb3 15. Rh7+ Kf8 16. Kd6
                                    Rd4+ 17. Ke5 Rd2
               29    46.37  -5.14   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc4 Kd7 7.
                                    b4 Bf3 8. Rd4+ Ke7 9. Rd3 Be2 10. Rd2
                                    Bc4 11. Rd4 Rb5+ 12. Kc6 Rxb4 13. Rd7+
                                    Ke8 14. Rc7 Bb3 15. Rc8+ Ke7 16. Rc7+
                                    Kf8 17. Rc8+ Kf7 18. Rc7+ Kg8 19. Kd6
                                    Bd5
               29->  54.05  -5.14   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc4 Kd7 7.
                                    b4 Bf3 8. Rd4+ Ke7 9. Rd3 Be2 10. Rd2
                                    Bc4 11. Rd4 Rb5+ 12. Kc6 Rxb4 13. Rd7+
                                    Ke8 14. Rc7 Bb3 15. Rc8+ Ke7 16. Rc7+
                                    Kf8 17. Rc8+ Kf7 18. Rc7+ Kg8 19. Kd6
                                    Bd5
               30     1:31  -5.45   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc5 Bd5 7.
                                    Kc7 Rxg5 8. b4 Rg2 9. b5 Rb2 10. b6
                                    g5 11. Rc1 g4 12. Rg1 Rc2+ 13. Kd6
                                    Rc6+ 14. Ke5 Rxb6 15. Rxg4 Rb2 16.
                                    Rg7 Rc2 17. Kf6 Rf2+ 18. Ke5
               30->   1:46  -5.45   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc5 Bd5 7.
                                    Kc7 Rxg5 8. b4 Rg2 9. b5 Rb2 10. b6
                                    g5 11. Rc1 g4 12. Rg1 Rc2+ 13. Kd6
                                    Rc6+ 14. Ke5 Rxb6 15. Rxg4 Rb2 16.
                                    Rg7 Rc2 17. Kf6 Rf2+ 18. Ke5
               31     2:25  -5.58   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc5 Bd5 7.
                                    Kc7 Ke7 8. b4 Re4 9. Rb5 Rg4 10. Rb6
                                    Bc4 11. Rb8 Rxg5 12. Kc6 Bb5+ 13. Kb6
                                    Kd6 14. Rc8 Rd5 15. Rf8 Bc6 16. Ka6
                                    Rb5 17. Rd8+ Bd7
               31->   3:31  -5.58   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc5 Bd5 7.
                                    Kc7 Ke7 8. b4 Re4 9. Rb5 Rg4 10. Rb6
                                    Bc4 11. Rb8 Rxg5 12. Kc6 Bb5+ 13. Kb6
                                    Kd6 14. Rc8 Rd5 15. Rf8 Bc6 16. Ka6
                                    Rb5 17. Rd8+ Bd7 (s=3)
               32     4:17  -5.71   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc5 Bd5 7.
                                    Kc7 Ke7 8. b4 Re4 9. Rb5 Rg4 10. Rb6
                                    Bc4 11. Rb8 Rxg5 12. Kc6 Rb5 13. Rxb5
                                    Bxb5+ 14. Kc5 Kd7 15. Kd4 Kd6 16. Ke4
                                    g5 17. Kd4 e5+ 18. Ke4 (s=2)
               32->   6:02  -5.71   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc5 Bd5 7.
                                    Kc7 Ke7 8. b4 Re4 9. Rb5 Rg4 10. Rb6
                                    Bc4 11. Rb8 Rxg5 12. Kc6 Rb5 13. Rxb5
                                    Bxb5+ 14. Kc5 Kd7 15. Kd4 Kd6 16. Ke4
                                    g5 17. Kd4 e5+ 18. Ke4 (s=2)
               33     7:30     -1   1. Ra8?                           
               33     8:52  -6.14   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc5 Bd5 7.
                                    Rc1 Rxg5 8. b4 Be4 9. Rc8+ Kd7 10.
                                    Rc7+ Kd6 11. Rc8 Bd5 12. b5 Rg2 13.
                                    Rd8+ Ke5 14. Rh8 g5 15. Kc5 g4 16.
                                    Rh5+ Kf4 17. Rh4 Rc2+ 18. Kd6 Rc4 19.
                                    Rh7 g3 20. Rf7+ Ke4 21. Rg7 Kf3 22.
                                    Ke5 Re4+ 23. Kd6
               33->  12:43  -6.14   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc5 Bd5 7.
                                    Rc1 Rxg5 8. b4 Be4 9. Rc8+ Kd7 10.
                                    Rc7+ Kd6 11. Rc8 Bd5 12. b5 Rg2 13.
                                    Rd8+ Ke5 14. Rh8 g5 15. Kc5 g4 16.
                                    Rh5+ Kf4 17. Rh4 Rc2+ 18. Kd6 Rc4 19.
                                    Rh7 g3 20. Rf7+ Ke4 21. Rg7 Kf3 22.
                                    Ke5 Re4+ 23. Kd6 (s=2)
               34    16:24  -6.42   1. Ra8 Rxc5+ 2. Kxb7+ Kf7 3. Ra7 Ke8
                                    4. Kb6 Rxe5 5. Rc7 Be4 6. Rc5 Bd5 7.
                                    Rc1 Rxg5 8. Rc7 Be4 9. Rh7 Rh5 10.
                                    Rc7 Rd5 11. b3 g5 12. Ra7 g4 13. Rg7
                                    Bf3 14. b4 <HT>           
               34    22:48  -6.39   1. Ra7 Rxc5+ 2. Kd7 Rxe5 3. Rxb7 Rxg5
                                    4. Kxe6 Bd3 5. Rc7 Rb5 6. Kf6 Rxb2
                                    7. Rg7+ Kh8 8. Rd7 Rb6+ 9. Kg5 Rb5+
                                    10. Kf4 g5+ 11. Kg3 Bf5 12. Rc7 Kg8
                                    13. Kf2 Rb2+ 14. Kg1 g4 15. Re7 Rc2
                                    16. Re5 Bc8 17. Re7 Kf8 18. Rh7 Bf5
                                    19. Rh5 Be4 20. Re5 Rg2+ 21. Kf1
               34    24:53     +1   1. Rc6!                           
               34    24:55  -6.04   1. Rc6 bxc6 2. b4 Be4 3. Kc7 Bd5 4.
                                    Bd6 Kf7 5. Bc5 Kg7 6. Bd6 Bg2 7. Bc5
                                    Kf7 8. Kc8 Bh1 9. Kc7 Bf3 10. Kc8 Bg2
                                    11. Kc7 Be4 12. Kc8 Bf3 13. Kc7 Bd5
                                    14. Bd6 Be4 15. Bc5 Bh1 16. Kc8 Ke8
                                    <HT>           
               34->  26:26  -6.04   1. Rc6 bxc6 2. b4 Be4 3. Kc7 Bd5 4.
                                    Bd6 Kf7 5. Bc5 Kg7 6. Bd6 Bg2 7. Bc5
                                    Kf7 8. Kc8 Bh1 9. Kc7 Bf3 10. Kc8 Bg2
                                    11. Kc7 Be4 12. Kc8 Bf3 13. Kc7 Bd5
                                    14. Bd6 Be4 15. Bc5 Bh1 16. Kc8 Ke8
                                    <HT>            (s=10)
               35    27:13  -6.04   1. Rc6 bxc6 2. b4 Be4 3. Kc7 Bd5 4.
                                    Bd6 Kf7 5. Bc5 Kg7 6. Bd6 Bg2 7. Bc5
                                    Kf7 8. Kc8 Bh1 9. Kc7 Bf3 10. Kc8 <HT>
                                               (s=9)
               35->  29:52  -6.04   1. Rc6 bxc6 2. b4 Be4 3. Kc7 Bd5 4.
                                    Bd6 Kf7 5. Bc5 Kg7 6. Bd6 Bg2 7. Bc5
                                    Kf7 8. Kc8 Bh1 9. Kc7 Bf3 10. Kc8 <HT>
                                               (s=5)
               36    33:50  -6.04   1. Rc6 bxc6 2. b4 Be4 3. Kc7 Bd5 4.
                                    Bd6 Kf7 5. Bc5 Kg7 6. Bd6 Bg2 7. Bc5
                                    Kf7 8. Kc8 Bh1 9. Kc7 Bf3 10. Kc8 <HT>
                                               (s=4)
               36->  38:46  -6.04   1. Rc6 bxc6 2. b4 Be4 3. Kc7 Bd5 4.
                                    Bd6 Kf7 5. Bc5 Kg7 6. Bd6 Bg2 7. Bc5
                                    Kf7 8. Kc8 Bh1 9. Kc7 Bf3 10. Kc8 <HT>
                                               (s=2)
               37    45:37  -6.04   1. Rc6 bxc6 2. b4 Be4 3. Kc7 Bd5 4.
                                    Bd6 Kf7 5. Bc5 Kg7 6. Bd6 Bg2 7. Bc5
                                    Kf7 8. Kc8 Bh1 9. Kc7 Be4 10. Kc8 Bf3
                                    11. Kc7 Bd5 12. Kc8 Kg7 13. Kc7 Bh1
                                    14. Kd6 <HT>           
               37->  58:12  -6.04   1. Rc6 bxc6 2. b4 Be4 3. Kc7 Bd5 4.
                                    Bd6 Kf7 5. Bc5 Kg7 6. Bd6 Bg2 7. Bc5
                                    Kf7 8. Kc8 Bh1 9. Kc7 Be4 10. Kc8 Bf3
                                    11. Kc7 Bd5 12. Kc8 Kg7 13. Kc7 Bh1
                                    14. Kd6 <HT>            (s=2)
              time=60:00  mat=0  n=91565664660  fh=70%  nps=25.4M     
              extensions=3126.9M qchecks=2219.0M reduced=1598.5M pruned=781.8M
              predicted=0  evals=4176.9M  50move=0  EGTBprobes=40.2M  hits=40.2M
              SMP->  splits=11146904  aborts=2028991  data=201/1024  elap=60:00
terminating SMP processes.
White(1): Rc6
              time used:  60:00
Black(1): quit

[IQ]

When doing your analysis on the position with Bg6+ as the intended solution, did you also check f4 right away? This seems to also win by force, although in some variations it seems like you have to go through completely winning endgames. What was your defensive idea against f4?

[zullil]

When doing your analysis on the position with Bg6+ as the intended solution, did you also check f4 right away? This seems to also win by force, although in some variations it seems like you have to go through completely winning endgames. What was your defensive idea against f4?

Crafty chooses f4 and holds it:

Code: Select all

Crafty v23.4 (16 cpus)

White(1): hash=2048M
Warning--  xboard 'memory' option disabled
hash table memory = 2048M bytes (128M entries).
White(1): setboard r3r2b/1bpq1k2/2n1pP2/1n1pP1p1/1p1P4/2PB4/PP1QNP1P/R4RK1 w - - 0 1
White(1): st 10800 
search time set to 10800.00.
White(1): display stats
display statistics at end of each search.
White(1): go
              time limit 180:00 (+0.00) (180:00)
              depth   time  score   variation (1)
starting thread 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 <done>
               10->   0.10   0.01   1. Bg6+ Kxg6 2. Qd3+ Kh5 3. Qh3+ Kg6
                                    4. Qd3+ (s=5)
               11     0.11   0.01   1. Bg6+ Kxg6 2. Qd3+ Kh5 3. Qh3+ Kg6
                                    4. Qd3+ (s=4)
               11->   0.20   0.01   1. Bg6+ Kxg6 2. Qd3+ Kh5 3. Qh3+ Kg6
                                    4. Qd3+ (s=6)
               12     0.23   0.01   1. Bg6+ Kxg6 2. Qd3+ Kh5 3. Qh3+ Kg6
                                    4. Qd3+ (s=5)
               12->   0.34   0.01   1. Bg6+ Kxg6 2. Qd3+ Kh5 3. Qh3+ Kg6
                                    4. Qd3+ (s=4)
               13     0.38   0.01   1. Bg6+ Kxg6 2. Qd3+ Kh5 3. Qh3+ Kg6
                                    4. Qd3+ (s=3)
               13->   0.48   0.01   1. Bg6+ Kxg6 2. Qd3+ Kh5 3. Qh3+ Kg6
                                    4. Qd3+ (s=9)
               14     0.52   0.01   1. Bg6+ Kxg6 2. Qd3+ Kh5 3. Qh3+ Kg6
                                    4. Qd3+ (s=8)
               14     0.66     +1   1. Bxb5!                         
               14     0.74   0.45   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qc4
                                    4. cxb4 c5 5. bxc5 Qxc5 6. Nb3 Qc4
                                    7. Qxg5 d4 8. Qh5+ Kg8 (s=4)
               14->   0.88   0.45   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qc4
                                    4. cxb4 c5 5. bxc5 Qxc5 6. Nb3 Qc4
                                    7. Qxg5 d4 8. Qh5+ Kg8 (s=8)
               15     1.02   0.49   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. cxb4 Bxf6 5. exf6 e5 6. Ne2 Qg4+
                                    7. Ng3 Kxf6 8. Rac1 Re7 (s=7)
               15->   1.47   0.49   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. cxb4 Bxf6 5. exf6 e5 6. Ne2 Qg4+
                                    7. Ng3 Kxf6 8. Rac1 Re7 (s=3)
               16     1.66   0.53   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Kf8 5. cxb4 Ra4 6. a3 Ba6 7.
                                    b5 Bb7 8. f4 gxf4 9. Rxf4 (s=2)
               16->   2.79   0.53   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Kf8 5. cxb4 Ra4 6. a3 Ba6 7.
                                    b5 Bb7 8. f4 gxf4 9. Rxf4 (s=6)
               17     3.06   0.53   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Kf8 5. cxb4 Ra4 6. a3 Ba6 7.
                                    b5 Bb7 8. f4 gxf4 9. Rxf4 (s=5)
               17->   6.24   0.53   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Kf8 5. cxb4 Ra4 6. a3 Ba6 7.
                                    b5 Bb7 8. f4 gxf4 9. Rxf4 (s=7)
               18     6.97     +1   1. Bxb5!                          
               18     7.31   0.63   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Kf8 5. cxb4 Ra4 6. a3 Ba6 7.
                                    b5 Rxd4 8. Qxd4 Bxb5 9. Rfc1 Kf7 (s=6)
               18->  12.13   0.63   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Kf8 5. cxb4 Ra4 6. a3 Ba6 7.
                                    b5 Rxd4 8. Qxd4 Bxb5 9. Rfc1 Kf7 (s=9)
               19    13.17   0.79   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Kf8 5. cxb4 Ra4 6. a3 Ba6 7.
                                    b5 Rxd4 8. Qxd4 Bxb5 9. Rfc1 Kf7 10.
                                    b4 (s=8)
               19->  31.06   0.79   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Kf8 5. cxb4 Ra4 6. a3 Ba6 7.
                                    b5 Rxd4 8. Qxd4 Bxb5 9. Rfc1 Kf7 10.
                                    b4 (s=9)
               20    33.24   0.96   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Rf8 5. cxb4 Ke8 6. Qh3 Ra6 7.
                                    a4 Qf7 8. b5 g4 9. Qh4 Ra5 10. Qxg4
                                    Rg8 (s=8)
               20->  43.40   0.96   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Rf8 5. cxb4 Ke8 6. Qh3 Ra6 7.
                                    a4 Qf7 8. b5 g4 9. Qh4 Ra5 10. Qxg4
                                    Rg8 (s=6)
               21    50.20   1.20   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Rf8 5. cxb4 Ke8 6. Qh3 Ra6 7.
                                    b5 Rb6 8. a4 c5 9. a5 cxd4 10. axb6
                                    Qf7 11. Qd3 (s=5)
               21->   1:13   1.20   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Rf8 5. cxb4 Ke8 6. Qh3 Ra6 7.
                                    b5 Rb6 8. a4 c5 9. a5 cxd4 10. axb6
                                    Qf7 11. Qd3 (s=6)
               22     1:27   1.19   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Rf8 5. cxb4 Ke8 6. Qh3 Ra6 7.
                                    b5 Rb6 8. a4 g4 9. Qd3 Bxf6 10. exf6
                                    Rxf6 11. a5 Rd6 (s=5)
               22->   3:12   1.19   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Rf8 5. cxb4 Ke8 6. Qh3 Ra6 7.
                                    b5 Rb6 8. a4 g4 9. Qd3 Bxf6 10. exf6
                                    Rxf6 11. a5 Rd6 (s=7)
               23     3:47   1.23   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Kf8 5. cxb4 Ra4 6. a3 Ba6 7.
                                    b5 Rxd4 8. Qxd4 Qxb5 9. Rfc1 Qb6 10.
                                    Rc5 Kf7 11. b4 Bc4 12. a4 (s=6)
               23->   6:38   1.23   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Kf8 5. cxb4 Ra4 6. a3 Ba6 7.
                                    b5 Rxd4 8. Qxd4 Qxb5 9. Rfc1 Qb6 10.
                                    Rc5 Kf7 11. b4 Bc4 12. a4 (s=7)
               24     7:44   1.29   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Kf8 5. cxb4 Qf7 6. Rfc1 Rac8
                                    7. Qe2 Bxf6 8. exf6 Qxf6 9. Nc6 Bxc6
                                    10. Rxc6 Re7 11. Re1 Ra8 12. a3 Rae8
                                    (s=6)
               24->  13:38   1.29   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Kf8 5. cxb4 Qf7 6. Rfc1 Rac8
                                    7. Qe2 Bxf6 8. exf6 Qxf6 9. Nc6 Bxc6
                                    10. Rxc6 Re7 11. Re1 Ra8 12. a3 Rae8
                                    (s=6)
               25    17:15   1.17   1. Bxb5 Nxe5 2. dxe5 Qxb5 3. Nd4 Qd7
                                    4. Qd3 Kf8 5. cxb4 Qf7 6. Rfc1 Rac8
                                    7. Qe2 g4 8. a4 Qg6 9. Rc3 c6 10. a5
                                    Qe4 11. Qxe4 dxe4 12. Rac1 Kf7 13.
                                    Nxc6 (s=5)
               25    39:55     +1   1. f4!                            
               25    47:07   2.20   1. f4 Nd6 2. fxg5 Ne4 3. g6+ Kxg6 4.
                                    Ng3 Rg8 5. Qe2 Qh7 6. f7 Qh4 7. fxg8=Q+
                                    Rxg8 8. Nxe4 dxe4 9. Bxe4+ Kh6+ 10.
                                    Kh1 Rg4 11. Qd2+ Qg5 12. Qd3 Rxe4 13.
                                    Qxe4 Na5 14. d5 Bxd5 (s=4)
               25->  53:19   2.20   1. f4 Nd6 2. fxg5 Ne4 3. g6+ Kxg6 4.
                                    Ng3 Rg8 5. Qe2 Qh7 6. f7 Qh4 7. fxg8=Q+
                                    Rxg8 8. Nxe4 dxe4 9. Bxe4+ Kh6+ 10.
                                    Kh1 Rg4 11. Qd2+ Qg5 12. Qd3 Rxe4 13.
                                    Qxe4 Na5 14. d5 Bxd5 (s=2)
               26   106:00   2.49   1. f4 Rg8 2. Bxb5 gxf4+ 3. Kh1 Ke8
                                    4. Nxf4 Qf7 5. Nxe6 Qxe6 6. Bxc6+ Qxc6
                                    7. f7+ Kd7 8. fxg8=Q Rxg8 9. Qf4 Qe6
                                    10. Qf7+ Qxf7 11. Rxf7+ Ke6 12. Rxc7
                                    Ba8 13. Rf1 bxc3 14. Rff7 Re8 15. bxc3
               26-> 140:02   2.49   1. f4 Rg8 2. Bxb5 gxf4+ 3. Kh1 Ke8
                                    4. Nxf4 Qf7 5. Nxe6 Qxe6 6. Bxc6+ Qxc6
                                    7. f7+ Kd7 8. fxg8=Q Rxg8 9. Qf4 Qe6
                                    10. Qf7+ Qxf7 11. Rxf7+ Ke6 12. Rxc7
                                    Ba8 13. Rf1 bxc3 14. Rff7 Re8 15. bxc3
                                    (s=2)
              time=180:00  mat=-3  n=302358514332  fh=144%  nps=28.0M 
              extensions=673.6M qchecks=1701.1M reduced=2009.6M pruned=1194.5M
              predicted=0  evals=1360.4M  50move=0  EGTBprobes=0  hits=0
              SMP->  splits=17792892  aborts=3938079  data=227/1024  elap=180:00
terminating SMP processes.
White(1): f4
              time used: 180:00