Test position

[muxecoid]

[d]1b3k2/2p2pp1/1pP1p2p/8/PP6/4P3/6NP/4K3 b - - 0 1

[zullil]

[d]1b3k2/2p2pp1/1pP1p2p/8/PP6/4P3/6NP/4K3 b - - 0 1

Critter-1.4 quickly decides to keep the bishop alive:

Code: Select all

25/48- 00:08  63576392 7597561  +0.46 Ke7 b5 Kd6 Kd2 g5 Ne1 Kd5 Kd3 f5 Nc2 Kd6 Ke2 h5 Kf2 h4 Ne1 g4 Ng2 Kc5 Nf4 Kb4 Nxe6 Kxa4 Nd4 Kb4 Ke2 Kc4
25/60  00:12  99482114 7759915  +0.57 b5 axb5 Ke7 Ke2 g5 Ne1 Kd6 Nf3 f5 Nd2 h5 e4 Ba7 Kf3 Bd4 Nc4+ Ke7 h3 g4+ hxg4 fxg4+ Kg3 e5 b6 cxb6 b5 Ke6 Nd2 Kd6 Nf1 Kc7 Kh4 Bc5 Kxh5
26/60  00:14 111307441 7727000  +0.57 b5 axb5 Ke7 Ke2 g5 Ne1 Kd6 Nf3 f5 Nd2 h5 e4 Ba7 Kf3 Bd4 Nc4+ Ke7 h3 g4+ hxg4 fxg4+ Kg3 e5 b6 cxb6 b5 Ke6 Nd2 Kd6 Nf1 Kc7 Kh4 Bc5 Kxh5
27/60  00:23 194353680 8192281  +0.63 b5 axb5 Ke7 Ke2 g5 Ne1 Kd6 Nf3 f5 Nd2 h5 e4 Ba7 Kf3 Bd4 Nc4+ Ke7 h3 g4+ hxg4 fxg4+ Kg3 Kd8 Na3 Be5+ Kh4 g3 Kh3 h4 b6 cxb6 Nb5 Bf4 Nd4 Ke7 Nb5 Be5 Kg2
28/60- 00:27 221031244 8056248  +0.55 b5 axb5 Ke7 Ke2 g5 Ne1 Kd6 Nf3 f5 Nd2 h5 e4 Ba7 Kf3 Bd4 Nc4+ Ke7 h3 g4+ hxg4 fxg4+ Kg3 Kd8 Na3 Be5+ Kh4 g3 Kh3 h4 b6 cxb6 Nb5 Bf4 Nd4 Ke7 Nb5 Be5 Kg2
28/60- 00:32 262891665 8051812  +0.46 b5 axb5 Ke7 Ke2 g5 Ne1 Kd6 Nf3 f5 Nd2 h5 e4 Ba7 Kf3 Bd4 Nc4+ Ke7 h3 g4+ hxg4 fxg4+ Kg3 Kd8 Na3 Be5+ Kh4 g3 Kh3 h4 b6 cxb6 Nb5 Bf4 Nd4 Ke7 Nb5 Be5 Kg2
28/60  00:36 291323984 8023906  +0.53 b5 axb5 Ke7 Ke2 g5 Ne1 Kd6 Nd3 f5 Nc5 Ba7 Nd7 e5 e4 fxe4 Nf6 Ke6 Nxe4 g4 Kf1 h5 Kg2 h4 h3 gxh3+ Kxh3 Kd5 Nf6+ Kc4 Kxh4 Kxb5 Kg4 Bd4 Kf5 Kxc6 Ne8 Bc3 Ke4 Kd7 Nf6+ Ke6
?
bestmove b5 ponder axb5

[gleperlier]

[d]1b3k2/2p2pp1/1pP1p2p/8/PP6/4P3/6NP/4K3 b - - 0 1

Analysis by Vitruvius_1.11C_HEM_x64:

1...Ke7 2.b5 Kd6 3.Kd2 g5 4.e4 Ke5 5.Kd3 f5 6.exf5 exf5 7.Ne3 h5 8.Nc4+ Ke6 9.Kd4 g4 10.Nb2 h4 11.Nd3 Kf6 12.Nf4 Kg5 13.Ne6+ Kg6 14.Ke3 Kf6 15.Nf8 g3 16.hxg3 h3 17.Kf2 Kg5 18.Nd7 Ba7 19.Ne5 f4
-/+ (-0.78) Depth: 31 00:05:04 954mN, tb=728979

(Gab, 13.05.2012)

[lech]

The result of Critter is accidental (too low depth and score).
[d]1b3k2/2p2pp1/1pP1p2p/8/PP6/4P3/6NP/4K3 b - - 0 1

Code: Select all

Sting SF 2.0 (slow computer)
info depth 35 seldepth 49 multipv 1 score cp 109 nodes 322680598 nps 898754 time
 359031 pv f8e7 e1d2 e7d6 b4b5 g7g5 g2e1 f7f5 e1d3 h6h5 e3e4 f5e4 d3f2 d6d5 d2e3
 g5g4 f2e4 d5e5 e4f2 e5f5 f2e4 h5h4 e4d2 b8a7 d2e4 e6e5 e4d6 f5e6 d6e4 a7b8 e4f2
 e6f5 f2e4 b8a7
info depth 36
info currmove f8e7 currmovenumber 1
info nodes 395770796 nps 862392 time 458922
info currmove g7g5 currmovenumber 2
info nodes 401212616 nps 860740 time 466125
info currmove f7f5 currmovenumber 3
info nodes 402129026 nps 860485 time 467328
info currmove b8a7 currmovenumber 4
info currmove h6h5 currmovenumber 5
info nodes 450106191 nps 835488 time 538734
info currmove b6b5 currmovenumber 6
info depth 36 seldepth 0 multipv 1 score cp 121 lowerbound nodes 514442738 nps 8
11484 time 633953 pv b6b5 a4b5 g7g5 e1e2 f8e7 e3e4 b8a7 h2h3 f7f5 e4f5 e6f5 g2e3
 e7e6 e2f3 a7e3 f3e3 e6d5 e3d3 h6h5 d3e3 h5h4 e3f3 d5d6 f3f2 g5g4
info nodes 514442738 nps 811463 time 633969
info currmove b6b5 currmovenumber 1
info depth 36 seldepth 0 multipv 1 score cp 133 lowerbound nodes 576722574 nps 7
94144 time 726219 pv b6b5 a4b5 g7g5 e1e2 f8e7 e3e4 b8a7 h2h3 f7f5 g2e3 a7e3 e2e3
 e7d6 e4e5 d6e7 e3d4
info nodes 576722574 nps 794144 time 726219
info currmove b6b5 currmovenumber 1
info nodes 739603884 nps 754842 time 979812
info currmove f8e7 currmovenumber 2
info currmove b8a7 currmovenumber 3
info currmove f7f5 currmovenumber 4
info currmove f7f6 currmovenumber 5
info nodes 740332771 nps 754563 time 981140
info currmove g7g5 currmovenumber 6
info currmove e6e5 currmovenumber 7
info currmove h6h5 currmovenumber 8
info currmove g7g6 currmovenumber 9
info currmove f8e8 currmovenumber 10
info currmove f8g8 currmovenumber 11
info depth 36 seldepth 49 multipv 1 score cp 145 nodes 740450005 nps 754478 time
 981406 pv b6b5 a4b5 g7g5 e1e2 f8e7 e3e4 b8a7 h2h3 f7f5 g2e3 a7e3 e2e3 e7d6 e4f5
 e6f5 e3f3 h6h5 h3h4 g5h4 f3f4 d6e7 b5b6 c7b6 b4b5 e7e6 f4f3 e6d6
info depth 37
info currmove b6b5 currmovenumber 1

[zullil]

The result of Critter is accidental (too low depth and score).
[d]1b3k2/2p2pp1/1pP1p2p/8/PP6/4P3/6NP/4K3 b - - 0 1

It does not appear to be accidental:

Code: Select all

Critter v1.4 64-bit SSE4, by Richard Vida
setoption name Hash value 4096
setboard 1b3k2/2p2pp1/1pP1p2p/8/PP6/4P3/6NP/4K3 b - - 0 1
info string Opening book: "book.cbk" - 57853 entries [native]
info string GTB Init OK (5 piece set)
info string Using 8 thread(s), 4096 MB hash
go infinite
 2/ 2  00:00        41    3416  +0.41 g5 a5 bxa5 bxa5
 2/ 2  00:00        72    5538  +0.49 Ke7 Ke2 Kd6
 3/ 3  00:00       145   11153  +0.50 Ke7 Ke2 g5 a5 bxa5 bxa5
 4/ 5  00:00       360   25714  +0.75 Ke7 Ke2 Kd6 b5 g5
 5/ 5  00:00       535   38214  +0.75 Ke7 Ke2 Kd6 b5 g5
 6/ 7  00:00       802   53466  +0.62 Ke7 Ke2 Kd6 b5 Kd5 Ne1 Ke4
 7/ 7  00:00      1444   84941  +0.62 Ke7 Ke2 Kd6 b5 Kd5 Ne1 Ke4
 8/ 9  00:00      2525  132894  +0.54 Ke7 Ke2 Kd6 b5 Kd5 Kd3 g5 Ne1
 9/11  00:00      6662  237928  +0.53 Ke7 b5 g5 Kd2 f5 Ne1 Kd6 Nd3 Kd5
10/13  00:00     10925  312142  +0.57 Ke7 b5 g5 Kd2 f5 Ne1 Kd6 Ke2 g4 Nd3
11/13  00:00     17527  417309  +0.55 Ke7 b5 g5 Kd2 f5 Ne1 Kd6 Ke2 Kd5 Nd3 Ke4 Nf2+ Ke5
12/15  00:00     29008  557846  +0.58 Ke7 b5 g5 Ke2 Kd6 Ne1 g4 Nd3 Kd5 Kd2 e5 Ke2
13/16  00:00     46270  690597  +0.57 Ke7 b5 Kd6 Kd2 Kc5 Kc3 g5 Ne1 Kd5 Kd2 g4 Nd3 e5 Ke2 f6
14/16  00:00     72763  856035  +0.64 Ke7 b5 Kd6 Kd2 Kc5 Kc3 g5 Ne1 Kd5 Kd2 f5 Nd3 h5 Ke2
15/19  00:00    120149  938664  +0.58 Ke7 b5 Kd6 Kd2 g5 Ne1 f5 Ke2 Kd5 Nd3 Ke4 Nf2+ Ke5 Nd3+ Kd5 Kf3 Kd6
16/31  00:00    196855 1036078  +0.56 Ke7 b5 Kd6 Kd2 g5 Ne1 f5 Ke2 Kd5 Nd3 Ke4 Nf2+ Ke5 Nd3+ Kd5 Kf3 h5 Nb4+ Kc4 Na6
17/31+ 00:00    308295 1185750  +0.65 Ke7 b5 Kd6 Kd2 g5 Ne1 f5 Ke2 Kd5 Nc2 Kc5 Nd4 Kd6 Nf3 g4 Ne1 e5 Nd3 Kd5
17/31  00:00    330785 1202854  +0.64 Ke7 b5 Kd6 Kd2 g5 Ne1 f5 Ke2 Kc5 Nd3+ Kc4 Ne5+ Kb4 Nd7 Ba7 Nf8 Kxa4 Nxe6 Kxb5 Nd4+ Kc5 Nxf5
18/31  00:00    450160 1364121  +0.64 Ke7 b5 Kd6 Kd2 g5 Ne1 f5 Ke2 Kc5 Nd3+ Kc4 Ne5+ Kb4 Nd7 Ba7 Nf8 Kxa4 Nxe6 Kxb5 Nd4+ Kc5 Nxf5
19/31  00:00    885685 1696714  +0.57 Ke7 b5 Kd6 Kd2 Kd5 Kd3 g5 Ne1 f5 Nc2 Kd6 Nb4 e5 Na6 Ba7 Ke2 e4 Nb4 h5 Na6 h4 Kf2 h3 Kg3
20/38+ 00:00   2129584 2166413  +0.66 Ke7 b5 Kd6 Kd2 Kd5 Kd3 g5 Ne1 f5 Nc2 Kc5 Nd4 Kd6 Ke2 Ba7 Kf3 Kd5 Nc2 h5 Nb4+ Kc4 Na6
20/38  00:01   2555002 2239265  +0.59 Ke7 b5 Kd6 Kd2 g5 e4 Ke5 Ke3 f5 exf5 exf5 Kf3 f4 Kg4 Ke4 Ne1 Ba7 h4 gxh4 Kxh4 h5 Kh3 Bb8 Kg2 h4 Nf3
21/38+ 00:01   3309827 2488591  +0.68 Ke7 b5 Kd6 Kd2 g5 e4 Ke5 Ke3 f5 exf5 exf5 Kf3 f4 Kg4 Ke4 Ne1 Ba7 h4 gxh4 Kxh4 h5 Kh3 Bb8 Kg2 h4 Nf3 h3+
21/47- 00:01   5299118 2916410  +0.51 Ke7 b5 Kd6 Kd2 g5 e4 Ke5 Ke3 f5 exf5 exf5 Kf3 f4 Kg4 Ke4 Ne1 Ba7 h4 gxh4 Kxh4 h5 Kh3 Bb8 Kg2 h4 Nf3 h3+
21/53  00:02   7076059 3228129  +0.62 Ke7 b5 Kd6 Kd2 g5 Ne1 f5 Nd3 e5 Ke2 h5 Kf2 h4 Ne1 e4 Nc2 f4 Nd4 Ke5 h3 Kd5 Nf5
22/53- 00:02   8481929 3456368  +0.53 Ke7 b5 Kd6 Kd2 g5 Ne1 f5 Nd3 e5 Ke2 h5 Kf2 h4 Ne1 e4 Nc2 f4 Nd4 Ke5 h3 Kd5 Nf5
22/53  00:02   8923135 3542332  +0.53 Ke7 b5 Kd6 Kd2 g5 Ne1 f5 Nd3 e5 Ke2 h5 Kf2 h4 Ne1 e4 Nc2 f4 h3 Ke5 Nd4 Ba7 Nc2 Kd5 Nb4+ Kc4
23/53- 00:03  19115400 4950893  +0.45 Ke7 b5 Kd6 Kd2 g5 Ne1 f5 Nd3 e5 Ke2 h5 Kf2 h4 Ne1 e4 Nc2 f4 h3 Ke5 Nd4 Ba7 Nc2 Kd5 Nb4+ Kc4
23/53+ 00:04  21483163 5184160  +0.62 Ke7 b5 Kd6 Kd2 g5 Ne1 f5 Nd3 e5 Ke2 h5 Kf2 h4 Ne1 e4 Nc2 Ke5 Nb4 Ba7 Na6 Kd6 Nb4 f4 Na6 h3 Ke2 f3+ Kf2 g4 Kg3
23/53  00:04  21548747 5175011  +0.60 Ke7 b5 Kd6 Kd2 g5 Ne1 f5 Nd3 e5 Ke2 h5 Kf2 Ba7 Nc1 g4 Kg3 Kd5 Ne2 Bb8 Kh4 Ke4 Ng3+ Kxe3 Nxf5+ Kf4 Ng3
24/53- 00:04  23109419 5180322  +0.51 Ke7 b5 Kd6 Kd2 g5 Ne1 f5 Nd3 e5 Ke2 h5 Kf2 Ba7 Nc1 g4 Kg3 Kd5 Ne2 Bb8 Kh4 Ke4 Ng3+ Kxe3 Nxf5+ Kf4 Ng3
24/53- 00:07  44089910 6237078  +0.42 Ke7 b5 Kd6 Kd2 g5 Ne1 f5 Nd3 e5 Ke2 h5 Kf2 Ba7 Nc1 g4 Kg3 Kd5 Ne2 Bb8 Kh4 Ke4 Ng3+ Kxe3 Nxf5+ Kf4 Ng3
24/59  00:07  48678927 6322759  +0.42 Ke7 b5 Kd6 Kd2 g5 Ne1 f5 Nd3 e5 Ke2 h5 Kf2 h4 Ne1 e4 Nc2 Kc5 Nd4 Kb4 Nxf5 Kxa4 Nd4 g4 Kg2 Kb4 Kf2 Ba7 Kg2 Kc4 Kf2 Kc5
24/59  00:08  58014273 6683672  +0.43 b5 axb5 Ba7 Ke2 Ke7 Ne1 Kd6 Nf3 g6 Nd2 Kd5 Kd3 e5 e4+ Kd6 Ke2 Bd4 Nc4+ Ke6 Kf3 f6 Nd2 h5 Nb3 Ke7 Nc5 Kd6 Nd7 Ke6
25/59  00:09  62969869 6669830  +0.43 b5 axb5 Ba7 Ke2 Ke7 Ne1 Kd6 Nf3 g6 Nd2 Kd5 Kd3 e5 e4+ Kd6 Ke2 Bd4 Nc4+ Ke6 Kf3 f6 Nd2 h5 Nb3 Ke7 Nc5 Kd6 Nd7 Ke6
26/59  00:12  88149038 6958951  +0.43 b5 axb5 Ba7 Ke2 Ke7 Ne1 Kd6 Nf3 g6 Nd2 Kd5 Kd3 e5 e4+ Kd6 Ke2 Bg1 Nf3 Bb6 Nd2 Ba7 h4 f6 Nf1 Bd4 Ne3 Ke6 Nd5
27/59  00:15 109556626 7009829  +0.43 b5 axb5 Ba7 Ke2 Ke7 Ne1 Kd6 Nf3 g6 Nd2 Kd5 Kd3 e5 e4+ Kd6 Ke2 Bg1 Kf3 f6 Kg2 Bd4 Kf3 Ke6 Nb3 h5 Nc5+ Kd6 Nb7+ Ke7 Nc5 Kd6
28/59+ 00:30 240522012 8008324  +0.51 b5 axb5 Ba7 Ke2 Ke7 Ne1 Kd6 Nf3 g6 Nd2 Kd5 Kd3 e5 e4+ Kd6 Ke2 Bg1 h3 Bd4 Kd3 f5 Nf3 Bf2 Ke2 fxe4 Kxf2 exf3 Kxf3 Kd5 h4 h5 Kg3 Kc4 b6
28/59+ 00:48 407911002 8476777  +0.60 b5 axb5 Ba7 Ke2 Ke7 Ne1 Kd6 Nf3 g6 Nd2 Kd5 Kd3 e5 e4+ Kd6 Ke2 Bg1 h3 Bd4 Kd3 f5 Nf3 Bf2 Ke2 fxe4 Kxf2 exf3 Kxf3 Kd5 h4 h5 Kg3 Kc4 b6
28/59  00:59 500058576 8427432  +0.60 b5 axb5 Ba7 Kf2 Ke7 Nf4 Kd6 Ke2 Ke5 Kd3 g6 h3 g5 Nh5 f6 Ng7 f5 Nh5 Bb6 Ke2 Kd5 Ng7 Kc4 Nxe6 Kxb4 Ng7 f4 exf4 gxf4 Kf3 Kxb5 Ne6 Kxc6 Kxf4 Kd5
29/59+ 01:39 878527844 8812862  +0.69 b5 axb5 Ba7 Kf2 Ke7 Nf4 Kd6 Ke2 Ke5 Kd3 g6 h3 g5 Nh5 f6 Ng7 f5 Nh5 Bb6 Ke2 Kd5 Ng7 Kc4 Nxe6 Kxb4 Ng7 f4 exf4 gxf4 Kf3 Kxb5 Ne6 Kxc6 Kxf4 Kd5
29/59- 01:57 1033952988 8789202  +0.51 b5 axb5 Ba7 Kf2 Ke7 Nf4 Kd6 Ke2 Ke5 Kd3 g6 h3 g5 Nh5 f6 Ng7 f5 Nh5 Bb6 Ke2 Kd5 Ng7 Kc4 Nxe6 Kxb4 Ng7 f4 exf4 gxf4 Kf3 Kxb5 Ne6 Kxc6 Kxf4 Kd5
29/66  01:58 1040057785 8769902  +0.54 b5 axb5 g5 Ke2 Ke7 Ne1 Ba7 Nd3 h5 Kf3 Kd6 h4 gxh4 e4 f5 exf5 exf5 Nf4 Bd4 Nxh5 Bc3 Kg2 Be5 Kh3 f4 Kg4 h3 Kxh3 f3 Ng3 Kd5 b6 cxb6 b5 Kc4 Nf1 Kxb5 Kg4 f2 Kf3 Kxc6 Kxf2 b5 Ke2 b4 Nd2 Kd5 Kd3 Bf6 Kc2
30/66  02:06 1103495375 8692567  +0.54 b5 axb5 g5 Ke2 Ke7 Ne1 Ba7 Nd3 h5 Kf3 Kd6 h4 gxh4 e4 f5 exf5 exf5 Nf4 Bd4 Nxh5 Bc3 Kg2 Be5 Kh3 f4 Kg4 h3 Kxh3 f3 Ng3 Kd5 b6 cxb6 b5 Kc4 Nf1 Kxb5 Kg4 f2 Kf3 Kxc6 Kxf2 b5 Ke3 b4 Nd2 Kd5 Kd3 Bf6 Kc2
31/66+ 03:21 1840178959 9116747  +0.63 b5 axb5 g5 Ke2 Ke7 Ne1 Ba7 Nd3 h5 Kf3 Kd6 h4 gxh4 e4 f5 exf5 exf5 Nf4 Bd4 Nxh5 Bc3 Kg2 Be5 Kh3 f4 Kg4 h3 Kxh3 f3 Ng3 Kd5 b6 cxb6 b5 Kc4 Nf1 Kxb5 Kg4 f2 Kf3 Kxc6 Kxf2 b5 Nd2 b4 Ke3 Kd5 Kd3 Bf6 Kc2
31/67  05:15 2973231917 9413608  +0.71 b5 axb5 g5 Ke2 Ke7 Ne1 h5 Kd3 Ba7 Nf3 g4 Ne5 f5 Ng6+ Kd6 Nh4 f4 exf4 Bg1 Ke4 Bxh2 f5 Bg3 Ng2 Ke7 fxe6 Kxe6 Nf4+ Bxf4 Kxf4 Kd6 Kg3 Kd5 Kf4 Ke6 Kg3 Kd6 Kf4 Ke6
32/67  06:30 3682279141 9430980  +0.71 b5 axb5 g5 Ke2 Ke7 Ne1 h5 Kd3 Ba7 Nf3 g4 Ne5 f5 Ng6+ Kd6 Nh4 f4 exf4 Bg1 Ke4 Bxh2 f5 Bg3 Ng2 Ke7 fxe6 Kxe6 Nf4+ Bxf4 Kxf4 Kd6 Kg3 Ke7 Kf4 Ke6 Kg3 Kd6 Kf4 Kd5 Kg3 Kd6
33/67  09:38 5649541788 9762082  +0.71 b5 axb5 g5 Ke2 Ke7 Ne1 h5 Kd3 Ba7 Nf3 g4 Ne5 f5 Ng6+ Kd6 Nh4 f4 exf4 Bg1 Ke4 Bxh2 f5 Bg3 Ng2 Ke7 fxe6 Kxe6 Nf4+ Bxf4 Kxf4 Kd6 Kg3 Ke7 Kf4 Ke6 Kg3 Kd6 Kf4 Kd5 Kg3 Kd6
34/67  14:27 8618644231 9935219  +0.71 b5 axb5 g5 Ke2 Ke7 Ne1 h5 Kd3 Ba7 Nf3 g4 Ne5 f5 Ng6+ Kd6 Nh4 f4 exf4 Bg1 Ke4 Bxh2 f5 Bg3 Ng2 Ke7 fxe6 Kxe6 Nf4+ Bxf4 Kxf4 Kd6 Kg3 Kd5 Kf4 Ke6 Kg3 Kd6 Kf4 Kd5 Kg3 Kd6

[muxecoid]

And slightly different yrt mostly the same position:
[d]1b6/2p2kp1/1pP1pp2/5P2/PP6/4P3/6N1/4K3 b - - 0 1

[zullil]

And slightly different yrt mostly the same position:
[d]1b6/2p2kp1/1pP1pp2/5P2/PP6/4P3/6N1/4K3 b - - 0 1

Code: Select all

38/79  150:33 96395525012 10671122  +0.05 exf5 Nf4 g5 Nd3 b5 axb5 Ba7 Nc5 Ke7 Ke2 g4 Nd3 Ke6 Nf4+ Kd6 Kd3 Ke5 Ng6+ Ke6 Nf4+ Kd6 Nh5 Ke5 Ke2 Bb6 Kd3 Kd6 Ke2 Kd5 Kd3 Ke5 Nf4 g3 Ng6+ Kd5 Nf4+ Kd6 Ke2 Ke5 Kf3 Ba7 Nh5 g2 Kxg2 Bxe3 Kf3 Bb6 Ng7 Kd5 Kf4 Kc4 Kxf5 Kxb4 Ne6 Kxb5 Kxf6 Ba7 Nxc7+