wonderful combination

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lech
Posts: 1136
Joined: Sun Feb 14, 2010 10:02 pm

wonderful combination

Post by lech »

In one of tested by me games there was a wonferful combination.
I discovered that the combination doesn't lead to win and I modified the start position.
Engines can solve it, however by many (many!) depths they have some doubts (++, --).
[d]1Rb1r3/2P4k/6p1/pP2qp1p/4p2P/8/B4PP1/3Q1K2 w - -
1.Rxc8!! Qxb5+
[d]2R1r3/2P4k/6p1/pq3p1p/4p2P/8/B4PP1/3Q1K2 w - -
2.Bc4!! Qxc4 3.Kg1 Rxc8 4.Qd7+ Kh6
[d]2r5/2PQ4/6pk/p4p1p/2q1p2P/8/5PP1/6K1 w - -
5.g4!! hxg4 6.Qxc8 Qc1+ 7.Kg2 Qc3 8.Qf8+ Kh7 9.Qe7+ Kh6
[d]8/2P1Q3/6pk/p4p2/4p1pP/2q5/5PK1/8 w - -
10.Qd6!! a4
[d]8/2P5/3Q2pk/5p2/p3p1pP/2q5/5PK1/8 w - -
11.Kh2!! wins!!

In the game there was possible:
[d]2R2r2/2P4k/6p1/p4p1p/2q1p2P/8/5PP1/3Q2K1 b - -
3... Rf7!! 4.Rh8+ Kh8 5.Qd8+ Kh7 6.c8Q Qxc8 7.Qxc8 e3 8.fxe3 Re7
[d]2Q5/4r2k/6p1/p4p1p/7P/4P3/6P1/6K1 b - -
with 9...Re4 draw (fortress!).

(the combination - White's move 51)
[pgn]
[Event "40 Moves in 29 min; 20 Moves in 15 min; Rest in 15 min + 1 sec/move"]
[Site "Engine Match"]
[Date "2013.01.21"]
[Round "2"]
[White "Sting SF 3"]
[Black "Houdini 1.5 a"]
[ECO "C88"]
[Result "1-0"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1
b5 7. Bb3 O-O 8. a4 Bb7 9. d3 Re8 10. Na3 d5 {+0.08/19
4:48m} 11. exd5 {+0.20/21 41s (axb5)} Nd4 {-0.01/20 53s}
12. c4 {+0.16/22 1:01m} Bb4 {-0.01/19 42s} 13. Rf1
{+0.24/21 57s} bxc4 {+0.05/18 49s} 14. dxc4 {+0.08/22
1:08m} Nxf3+ {+0.02/19 1:00m} 15. Qxf3 {+0.24/22 1:15m} Rb8
{+0.06/19 1:17m (e4)} 16. Be3 {+0.24/20 40s (Nc2)} Bc8
{-0.10/19 38s} 17. h3 {+0.24/21 42s} Bd6 {-0.04/19 58s}
18. Qd1 {-0.08/21 44s} Nd7 {-0.08/20 47s} 19. Bc2 {0.00/22
1:15m (Rb1)} e4 {-0.06/20 53s (Rxb2)} 20. Rb1 {0.00/21
1:11m} Qf6 {-0.06/20 35s} 21. Re1 {-0.08/21 1:04m} Rxb2
{-0.05/20 49s (Qe5)} 22. Bd4 {0.00/23 40s} Rxb1 {-0.05/19
0s} 23. Nxb1 {0.00/26 2:54m} Qg6 {-0.07/19 37s} 24. Nd2
{0.00/25 58s} f5 {-0.07/17 0s} 25. a5 {-0.20/23 2:32m} Qg5
{-0.10/18 39s (Bb4)} 26. Be3 {0.00/23 56s} Qf6 {-0.08/19
1:23m (Qg6)} 27. Qa1 {-0.16/22 1:06m} Qg6 {-0.05/18 59s
(Be5)} 28. Qc3 {0.00/23 2:00m (Bd4)} Nc5 {+0.06/19 50s
(Nf6)} 29. Bxc5 {0.00/21 26s} Bxc5 {+0.05/17 0s} 30. Nb3
{0.00/23 28s} Be7 {+0.15/21 1:35m (Ba7)} 31. c5 {+0.16/20
25s} Bg5 {+0.12/20 53s (Bh4)} 32. Nd4 {+0.16/20 43s} Kh8
{+0.17/19 38s (Qf6)} 33. Ba4 {+0.40/20 36s (Qc4)} Rg8
{+0.16/19 40s (Rd8)} 34. Qc4 {+0.44/19 39s} Bf4 {+0.18/19
1:10m (Qf6)} 35. Kf1 {+0.52/20 50s (Re2)} Qh6 {+0.21/18
1:04m (Qf6)} 36. Bb3 {+0.84/20 27s (Ne6)} Re8 {+0.63/19
1:45m (Be5)} 37. Qa4 {+0.80/23 1:04m (Rb1)} Rg8 {+0.59/18
38s (Qg6)} 38. Ne6 {+1.47/21 48s (d6)} Bd2 {+0.58/17 28s
(Bxe6)} 39. Re2 {+1.53/22 25s} Bf4 {+1.01/18 59s (e3)}
40. Nxc7 {+1.69/20 11s (Qd4)} Bxc7 {+1.00/18 16s} 41. d6
{+1.81/25 55s} Rf8 {+1.04/20 34s} 42. dxc7 {+1.77/24 38s}
Qc1+ {+1.01/19 0s} 43. Re1 {+2.02/25 42s} Qxc5 {+0.98/20
1:28m} 44. Qc4 {+2.22/26 48s} Qxa5 {+1.03/22 1:32m} 45. Rd1
{+2.05/26 2:30m} h5 {+1.09/22 48s} 46. Qc1 {+1.97/24 1:13m}
Kh7 {+1.21/22 1:05m} 47. Rd5 {+2.10/23 34s} Qb6 {+1.32/21
53s} 48. Qd1 {+2.18/23 34s} g6 {+1.32/20 0s} 49. Rd8
{+2.26/23 35s} Qc5 {+1.29/20 42s} 50. h4 {+2.38/22 1:13m
(Qd5)} a5 {+1.40/18 32s (Kh6)} 51. Rxc8 {+4.60/27 30s
(Qd2)} Qb5+ {+2.91/20 1:17m} 52. Bc4 {+4.88/30 23s} Qxc4+
{+3.39/18 0s} 53. Kg1 {0.00/36 32s} Rxc8 {+1.99/18 40s}
54. Qd7+ {0.00/37 27s} Kh6 {+3.23/18 0s} 55. g4 {+1.69/27
30s} hxg4 {+3.13/21 1:12m (Qc1+)} 56. Qxc8 {0.00/34 24s}
Qc1+ {+3.00/20 0s} 57. Kg2 {0.00/36 1:13m} Qc3 {+3.00/20
1s} 58. Qf8+ {+3.19/22 12s} Kh7 {+3.00/19 0s} 59. Qe7+
{+3.11/23 27s} Kh6 {+3.00/18 0s} 60. Qd6 {+3.71/23 21s} a4
{+3.00/22 4:10m} 61. Kh2 {+5.05/25 1:26m} Qc2 {+2.89/20
15s} 62. Kg3 {+5.37/26 1:20m} Qc3+ {+2.89/19 26s (e3)}
63. Kf4 {+5.29/25 24s} Qc1+ {+2.89/19 28s} 64. Ke5
{+5.29/25 24s} g3 {+2.86/19 21s (Kh5)} 65. fxg3 {+7.03/19
20s (Qf8+)} Qc3+ {+3.47/17 2:15m (Kh5)} 66. Ke6 {+7.83/20
19s (Kd5)} 1-0
[/pgn]
Maybe, I can't be friendly, but let me be useful.
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JVMerlino
Posts: 1357
Joined: Wed Mar 08, 2006 10:15 pm
Location: San Francisco, California

Re: wonderful combination

Post by JVMerlino »

Not difficult at all for my very mediocre engine, Myrddin -- found at depth 15:

Code: Select all

 1  -116      0         3 b8c8 e8c8 
 1   -29      0         9 f1g1 e5c7 
 1    42      0        19 d1d8 e8d8 c7d8Q e5b8 d8a5 
 1   171      1        46 d1c2 (3 KNPS)
 1   189      1       105 b5b6 (7 KNPS)
 2   149      1       212 b5b6? c8a6 (14 KNPS)
 2   155      1       501 d1c2 h7h8 (33 KNPS)
 3   167      1       955 d1c2 e5f6 c2d2 (63 KNPS)
 4   179      3      2491 d1c2 e5a1 f1e2 a1f6 c2d2 (80 KNPS)
 5   164      4      7052 d1c2 e4e3 f2e3 e5e3 a2d5 (150 KNPS)
 5   199      7     16774 d1c1 a5a4 a2f7 e8f8 b5b6 f8f7 b8c8 (215 KNPS)
 6   183      7     19591 d1c1 a5a4 f1g1 e5f6 b8a8 f6d4 (251 KNPS)
 7   202     14     55391 d1c1 f5f4 a2f7 e8f8 c1c4 e5a1 f1e2 a1f6 (395 KNPS)
 8   185     17     75459 d1c1 f5f4 a2f7 e8f8 c1c4 e5a1 f1e2 a1b2 e2e1 b2b4 e1d1 b4c4 f7c4 (441 KNPS)
 9   171     23    124011 d1c1 f5f4 a2f7 e8f8 f7c4 e4e3 b5b6 e3f2 f1f2 (529 KNPS)
10   160     39    242615 d1c1 f5f4 a2f7 e8f8 f7c4 e4e3 b5b6 e3f2 b6b7 e5c7 b7c8Q f8c8 b8c8 c7c8 f1f2 (622 KNPS)
11   165     68    480091 d1c1 f5f4 a2f7 e8f8 f7c4 e4e3 b5b6 f4f3 f2e3 f3g2 f1g2 e5e4 g2g3 (699 KNPS)
12   125    134    974132 d1c1? f5f4 (725 KNPS)
12   126    266   2043083 d1c1 f5f4 a2f7 e8f8 f7c4 f4f3 g2f3 e4f3 f1g1 e5e7 b5b6 e7h4 (765 KNPS)
13    95    421   3180874 d1c1 f5f4 b5b6 c8a6 a2c4 a6c4 c1c4 e5a1 f1e2 f4f3 g2f3 e4f3 e2d3 a1d1 d3c3 d1c1 c3b3 c1b1 b3a4 b1a1 a4b5 a1e5 b5a4 e8b8 c7b8Q e5b8 a4a5 (755 KNPS)
14   135    786   6063778 d1c1! (771 KNPS)
14    55    978   7465545 d1c1? e4e3 (763 KNPS)
14    75   1634  12551798 b5b6 c8a6 f1g1 e8b8 d1d7 h7h6 c7b8Q e5b8 d7d2 h6h7 d2a5 a6b7 a5c5 b8h8 c5c7 h8g7 a2c4 h7h8 (767 KNPS)
15    66   2289  20687529 b5b6 e4e3 f2e3 c8a6 f1g1 e8b8 c7b8Q e5b8 d1d7 h7h6 d7c7 b8a8 c7f4 h6h7 a2b3 a8e4 f4c7 h7h6 c7c3 e4h4 c3a5 (769 KNPS)
15   115   2418  22655693 b8c8! (776 KNPS)
15   225   2498  23384508 b8c8! (779 KNPS)
15   361   4733  45716523 b8c8 e5b5 a2c4 b5c4 f1g1 e8e7 c8h8 h7h8 d1d8 c4g8 c7c8Q e7g7 d8g8 g7g8 c8c3 h8h7 c3c7 g8g7 c7a5 g7d7 a5e5 d7d2 g1f1 (857 KNPS)
16   361   5644  48361516 b8c8 e5b5 a2c4 b5c4 f1g1 e8e7 c8h8 h7h8 d1d8 c4g8 c7c8Q e7g7 d8g8 g7g8 c8c3 h8h7 c3c7 g8g7 c7a5 g7d7 a5e5 d7d2 g1f1 h7h6 (856 KNPS)
17   401   6347  54395580 b8c8! (856 KNPS)
17   511   7467  62798721 b8c8! (840 KNPS)
jm
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kgburcham
Posts: 2016
Joined: Sun Feb 17, 2008 4:19 pm

Re: wonderful combination

Post by kgburcham »

huge variation in smp with this position, solve in under 5 seconds to solve in over 4 minutes. default settings

[D] 1Rb1r3/2P4k/6p1/pP2qp1p/4p2P/8/B4PP1/3Q1K2 w - -

Houdini

CPU0: GenuineIntel Intel64 Family 6 Model 44 Stepping 0 4371 MHz
CPU1: GenuineIntel Intel64 Family 6 Model 44 Stepping 0 4371 MHz
CPU2: GenuineIntel Intel64 Family 6 Model 44 Stepping 0 4371 MHz
CPU3: GenuineIntel Intel64 Family 6 Model 44 Stepping 0 4371 MHz
CPU4: GenuineIntel Intel64 Family 6 Model 44 Stepping 0 4371 MHz
CPU5: GenuineIntel Intel64 Family 6 Model 44 Stepping 0 4371 MHz
CPU6: GenuineIntel Intel64 Family 6 Model 44 Stepping 0 4371 MHz
CPU7: GenuineIntel Intel64 Family 6 Model 44 Stepping 0 4371 MHz
CPU8: GenuineIntel Intel64 Family 6 Model 44 Stepping 0 4371 MHz
CPU9: GenuineIntel Intel64 Family 6 Model 44 Stepping 0 4371 MHz
CPU10: GenuineIntel Intel64 Family 6 Model 44 Stepping 0 4371 MHz
CPU11: GenuineIntel Intel64 Family 6 Model 44 Stepping 0 4371 MHz
12 processor(s) found, POPCNT available
NUMA configuration with 2 node(s), offset 0
4096 MB Large Page Hash
Nalimov 6 men EGTB available - 999 MB cache
Engine: Houdini 3 Pro x64 (4096 MB)
by Robert Houdart

25/68 0:27 +0.46 1.Qb3 Qxc7 2.Qf7+ Qxf7 3.Bxf7 Re7 4.Bd5 Be6 5.Bc6 Rc7 6.Ra8 Kg7 7.Ke2 Bd7 8.Bxd7 Rxd7 9.b6 Kf6 10.Rxa5 Rb7 11.Rb5 Ke6 12.Ke3 Kd6 13.Kf4 Kc6 14.Rb1 (880.033.166) 31515
25/81 0:38 +0.48++ 1.Rxc8 (1.295.369.863) 33437 TB:201
25/81 0:40 +0.63++ 1.Rxc8 (1.361.308.864) 33653 TB:238
other best move - reduce depth to 22
22/81 0:40 +1.04++ 1.Rxc8 (1.375.122.985) 33683 TB:238
22/98 0:42 +2.27++ 1.Rxc8 (1.415.785.395) 33699 TB:238
22/109 1:26 +3.99 1.Rxc8 Qxb5+ 2.Bc4 Qxc4+ 3.Kg1 Rxc8 4.Qd7+ Kh6 5.g4 Qc1+ 6.Kg2 hxg4 7.Qxc8 Qc3 8.Qf8+ Kh7 9.Qe7+ Kh6 10.Qd6 a4 11.Kh2 Qc2 12.Kg3 e3 13.Qf8+ Kh7 14.Qe7+ (3.161.286.149) 36643 TB:523
23/109 1:28 +3.99 1.Rxc8 Qxb5+ 2.Bc4 Qxc4+ 3.Kg1 Rxc8 4.Qd7+ Kh6 5.g4 Qc1+ 6.Kg2 hxg4 7.Qxc8 Qc3 8.Qf8+ Kh7 9.Qe7+ Kh6 10.Qd6 a4 11.Kh2 Qc2 12.Kg3 e3 13.Qf8+ Kh7 14.Qe7+ (3.247.369.308) 36683 TB:525
24/109 1:31 +4.16++ 1.Rxc8 (3.356.762.952) 36748 TB:554
24/109 1:33 +4.49++ 1.Rxc8 (3.453.521.908) 36789 TB:608
24/109 1:36 +5.35++ 1.Rxc8 (3.539.912.049) 36767 TB:750
24/109 1:59 +7.78++ 1.Rxc8 (4.416.053.469) 36885 TB:790
24/109 2:15 +8.02 1.Rxc8 Qxb5+ 2.Bc4 Qxc4+ 3.Kg1 Rxc8 4.Qd7+ Kh6 5.g4 Qc1+ 6.Kg2 hxg4 7.Qxc8 Qc3 8.Qf8+ Kh7 9.Qe7+ Kh6 10.Qd6 a4 11.Kh2 g3+ 12.Qxg3 Qc2 13.Qe3+ Kg7 14.Qa7 (5.029.789.985) 37070 TB:847
25/109 2:21 +8.35++ 1.Rxc8 (5.232.404.023) 37081 TB:857
25/109 2:26 +8.55 1.Rxc8 Qxb5+ 2.Bc4 Qxc4+ 3.Kg1 Rxc8 4.Qd7+ Kh6 5.g4 Qc1+ 6.Kg2 hxg4 7.Qxc8 Qc3 8.Qf8+ Kh7 9.Qe7+ Kh6 10.Qd6 a4 11.Kh2 g3+ 12.Qxg3 Qc2 13.Qe3+ Kg7 14.Qa7 (5.416.004.475) 37067 TB:889
26/109 2:39 +8.72 1.Rxc8 Qxb5+ 2.Bc4 Qxc4+ 3.Kg1 Rxc8 4.Qd7+ Kh6 5.g4 Qc1+ 6.Kg2 hxg4 7.Qxc8 Qc3 8.Qf8+ Kh7 9.Qe7+ Kh6 10.Qd6 a4 11.Kh2 Qc2 12.Kg3 Qb3+ 13.Kf4 Qf3+ 14.Ke5 (5.904.697.017) 37099 TB:926
27/109 2:56 +8.75 1.Rxc8 Qxb5+ 2.Bc4 Qxc4+ 3.Kg1 Rxc8 4.Qd7+ Kh6 5.g4 Qc1+ 6.Kg2 hxg4 7.Qxc8 Qc3 8.Qf8+ Kh7 9.Qe7+ Kh6 10.Qd6 a4 11.Kh2 Qc2 12.Kg3 Qb3+ 13.Kf4 Qf3+ 14.Ke5 (6.548.972.551) 37180 TB:945
28/109 3:12 +8.75 1.Rxc8 Qxb5+ 2.Bc4 Qxc4+ 3.Kg1 Rxc8 4.Qd7+ Kh6 5.g4 Qc1+ 6.Kg2 hxg4 7.Qxc8 Qc3 8.Qf8+ Kh7 9.Qe7+ Kh6 10.Qd6 a4 11.Kh2 Qc2 12.Kg3 Qb3+ 13.Kf4 Qf3+ 14.Ke5 (7.152.298.146) 37234 TB:1.066
29/109 4:28 +9.11++ 1.Rxc8 (10.140.951.468) 37791 TB:2.252
29/109 5:59 +9.83++ 1.Rxc8 (13.764.526.999) 38272 TB:3.944
29/109 6:26 +9.46 1.Rxc8 Qxb5+ 2.Bc4 Qxc4+ 3.Kg1 Rxc8 4.Qd7+ Kh6 5.g4 Qc1+ 6.Kg2 hxg4 7.Qxc8 Qc3 8.Qf8+ Kh7 9.Qe7+ Kh6 10.Qd6 a4 11.Kh2 Qc2 12.Kg3 Qc3+ 13.Kf4 Qc1+ 14.Ke5 (14.785.555.710) 38273 TB:4.080
30/109 7:00 +9.06-- 1.Rxc8 Qxb5+ (16.198.433.681) 38518 TB:5.621
30/109 9:56 +9.85++ 1.Rxc8 (23.184.130.742) 38860 TB:16.963
30/109 12:22 +10.64++ 1.Rxc8 (28.883.251.983) 38900 TB:20.099
30/109 12:49 +9.74 1.Rxc8 Qxb5+ 2.Bc4 Qxc4+ 3.Kg1 Rxc8 4.Qd7+ Kh6 5.g4 Qc1+ 6.Kg2 hxg4 7.Qxc8 Qc3 8.Qf8+ Kh7 9.Qe7+ Kh6 10.Qd6 a4 11.Kh2 Qc2 12.Kg3 Qc3+ 13.Kf4 Qc1+ 14.Ke5 (29.988.811.928) 38955 TB:20.431
31/109 16:00 +10.14++ 1.Rxc8 (37.696.147.026) 39254 TB:35.518
31/109 19:07 +10.95++ 1.Rxc8 (45.204.081.358) 39380 TB:45.411
31/109 19:19 +10.47 1.Rxc8 Qxb5+ 2.Bc4 Qxc4+ 3.Kg1 Rxc8 4.Qd7+ Kh6 5.g4 Qc1+ 6.Kg2 hxg4 7.Qxc8 Qc3 8.Qf8+ Kh7 9.Qe7+ Kh6 10.Qd6 a4 11.Kh2 Qc2 12.Kg3 Qc3+ 13.Kf4 Qc1+ 14.Ke5 (45.705.238.984) 39401 TB:45.453
31/109 20:57 +10.47 1.Rxc8 Qxb5+ 2.Bc4 Qxc4+ 3.Kg1 Rxc8 4.Qd7+ Kh6 5.g4 Qc1+ 6.Kg2 hxg4 7.Qxc8 Qc3 8.Qf8+ Kh7 9.Qe7+ Kh6 10.Qd6 a4 11.Kh2 Qc2 12.Kg3 Qc3+ 13.Kf4 Qc1+ 14.Ke5 (49.664.027.276) 39485 TB:59.637
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lech
Posts: 1136
Joined: Sun Feb 14, 2010 10:02 pm

Re: wonderful combination

Post by lech »

In the play the start position of this combination was:
[d]2bR1r2/2P4k/6p1/p1q2p1p/4p2P/1B6/5PP1/3Q1K2 w - - 0 51
51.Rxc8 Qb5+ 52.Bc4 Qxc4+ 53.Kg1 Rxc8 54.Qd7+ Kh6 55.g4 hxg4 56.Qxc8 Qc1+ 57.Kg2 Qc3 58.Qf8+ Kh7 59.Qe7+ Kh6 60.Qd6 a4 61.Kh2
The move 51.Rxc8 leads to draw by 53...Rf7!! and fortress.
Probably the move 51.Qd5 wins.
It would be good to know the analysis of Houdini 3 on a very fast machine. :)
Maybe, I can't be friendly, but let me be useful.
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Martin Hertz
Posts: 61
Joined: Wed Mar 14, 2012 9:43 pm

Re: wonderful combination

Post by Martin Hertz »

MChess 1.70 finds the solution 1.Rxc8!! at depth 8 (+4.90).
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lech
Posts: 1136
Joined: Sun Feb 14, 2010 10:02 pm

Re: wonderful combination

Post by lech »

kgburcham wrote:
lech wrote:In the play the start position of this combination was:
[d]2bR1r2/2P4k/6p1/p1q2p1p/4p2P/1B6/5PP1/3Q1K2 w - - 0 51
51.Rxc8 Qb5+ 52.Bc4 Qxc4+ 53.Kg1 Rxc8 54.Qd7+ Kh6 55.g4 hxg4 56.Qxc8 Qc1+ 57.Kg2 Qc3 58.Qf8+ Kh7 59.Qe7+ Kh6 60.Qd6 a4 61.Kh2
The move 51.Rxc8 leads to draw by 53...Rf7!! and fortress.
Probably the move 51.Qd5 wins.
It would be good to know the analysis of Houdini 3 on a very fast machine. :)


I replied to the original post which was this position.
You replied to my post by moving the black rook.
what is your point about the first position?
what is your point about the second position?
[D] 1Rb1r3/2P4k/6p1/pP2qp1p/4p2P/8/B4PP1/3Q1K2 w - -
Sorry if it is not clear. :oops:
Your post for the "original" position shows the win move 1.Rxc8!! :D
But much more interesting is the second position (with Rd8).
[d]2bR1r2/2P4k/6p1/p1q2p1p/4p2P/1B6/5PP1/3Q1K2 w - - 0 51
The position happened in the game and now move Rxc8 leads to draw.
The analysis of this position can be very intersting.
It would be good to try it (high depths). :)
Maybe, I can't be friendly, but let me be useful.
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lech
Posts: 1136
Joined: Sun Feb 14, 2010 10:02 pm

Re: wonderful combination

Post by lech »

Martin Hertz wrote:MChess 1.70 finds the solution 1.Rxc8!! at depth 8 (+4.90).
Sorry but now Rxc8 leads to draw! :)
Maybe, I can't be friendly, but let me be useful.
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kgburcham
Posts: 2016
Joined: Sun Feb 17, 2008 4:19 pm

Re: wonderful combination

Post by kgburcham »

lech wrote:
Martin Hertz wrote:MChess 1.70 finds the solution 1.Rxc8!! at depth 8 (+4.90).
Sorry but now Rxc8 leads to draw! :)
MChess 1.70 finds the solution 1.Rxc8!! at depth 8 (+4.90).
Is Martin talking about the modified position or the game position?
one wins and one draws.
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Martin Hertz
Posts: 61
Joined: Wed Mar 14, 2012 9:43 pm

Re: wonderful combination

Post by Martin Hertz »

kgburcham wrote:
lech wrote:
Martin Hertz wrote:MChess 1.70 finds the solution 1.Rxc8!! at depth 8 (+4.90).
Sorry but now Rxc8 leads to draw! :)
MChess 1.70 finds the solution 1.Rxc8!! at depth 8 (+4.90).
Is Martin talking about the modified position or the game position?
one wins and one draws.
The modified position of course.
[d]1Rb1r3/2P4k/6p1/pP2qp1p/4p2P/8/B4PP1/3Q1K2 w - -
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lech
Posts: 1136
Joined: Sun Feb 14, 2010 10:02 pm

Re: wonderful combination

Post by lech »

Martin Hertz wrote:
kgburcham wrote:
lech wrote:
Martin Hertz wrote:MChess 1.70 finds the solution 1.Rxc8!! at depth 8 (+4.90).
Sorry but now Rxc8 leads to draw! :)
MChess 1.70 finds the solution 1.Rxc8!! at depth 8 (+4.90).
Is Martin talking about the modified position or the game position?
one wins and one draws.
The modified position of course.
[d]1Rb1r3/2P4k/6p1/pP2qp1p/4p2P/8/B4PP1/3Q1K2 w - -
If your engine doesn;t leave the move Rxc8 in the next depth, it means you should try another versions. Good luck! :D
Maybe, I can't be friendly, but let me be useful.
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