Author: andrew tanner
Date: 15:09:20 11/16/02
Go up one level in this thread
On November 16, 2002 at 17:36:08, Uri Blass wrote:
>On November 16, 2002 at 17:08:24, andrew tanner wrote:
>
>> Best move: Rxe7! and a mate in x follows.
>>Taken from one of Capablanca's instructional games.
>
>Finding the move is only few seconds
>
>[D]2n2rk1/1pqrbppp/p2p4/2pQ4/6P1/1P1B1N1P/P3RP2/3R2K1 w - - 0
>
>Movei fails to see the mate in X to follow and can see only winning the bishop
>Can you post the mate line for white after the logical moves Rxe7 g6
>
>Some analysis by movei(PIII850)
>
>it needs only few seconds to find it
>
>9 -36 373 511001 d3h7 g8h7 e2e7 h7g8 e7d7 c7d7 f3g5 d7e7 g5e4 e7h4 e4g5
>9 -35 505 687093 e2e7
>9 132 609 829676 e2e7 c8e7 d3h7 g8h8 d5h5 e7g8 h7f5 g8h6 g4g5 d7e7 g5h6 g7g6
>9 132 653 894091 e2e7 c8e7 d3h7 g8h8 d5h5 e7g8 h7f5 g8h6 g4g5 d7e7 g5h6 g7g6
>10 121 697 965871 e2e7 c8e7 d3h7 g8h8 d5h5 e7g8 h7f5 g8h6 g4g5 d7e7 g5h6 g7g6
>h5g5
>
>Later
>
>depth=10 +1.21 e2e7 c8e7 d3h7 g8h8 d5h5 e7g8 h7f5 g8h6 g4g5 d7e7 g5h6 g7g6 h5g5
>Nodes: 1377228 NPS: 143311
>Time: 00:00:09.61
>depth=11 +2.55 e2e7 g7g6 e7d7 c7d7 d3e4 b7b6 d5b7 d7b7 e4b7 a6a5 b7c8 f8c8 d1d6
>Nodes: 9048476 NPS: 129411
>Time: 00:01:09.92
>depth=12 +2.55 e2e7 g7g6 e7d7 c7d7 d3e4 b7b6 d5b7 d7b7 e4b7 a6a5 b7c8 f8c8 d1d6
>Nodes: 12303650 NPS: 129785
>Time: 00:01:34.80
>depth=12 +2.55 e2e7 g7g6 e7d7 c7d7 d3e4 b7b6 d5b7 d7b7 e4b7 a6a5 b7c8 f8c8 d1d6
>Nodes: 13821222 NPS: 130180
>Time: 00:01:46.17
>depth=13 +2.71 e2e7 g7g6 e7d7 c7d7 d3e4 b7b6 d5b7 d7e7 b7e7 c8e7 d1d6 f7f5 g4f5
>g6f5
>Nodes: 26993900 NPS: 130955
>Time: 00:03:26.13
>depth=13 +2.71 e2e7 g7g6 e7d7 c7d7 d3e4 b7b6 d5b7 d7e7 b7e7 c8e7 d1d6 f7f5 g4f5
>g6f5
>Nodes: 32047508 NPS: 133126
>Time: 00:04:00.73
>depth=14 +2.66 e2e7 g7g6 e7d7 c7d7 d3e4 b7b6 d5b7 d7e7 b7e7 c8e7 d1d6 f7f5 g4f5
>g6f5 e4b7
>Nodes: 41930702 NPS: 132839
>Time: 00:05:15.65
>
>After Rxe7 Nxe7? movei still cannot see the mate
>
>depth=11 +5.79 d3h7 g8h8 d5h5 g7g5 h7f5 h8g7 h5h7 g7f6 h7h6 e7g6 f5g6 f8e8 g6f5
>f6e7 d1e1 e7d8 h6f6 d7e7 f3g5 e8f8 g5f7 d8e8 e1e7 c7e7 f7d6 e8d8 d6b7
>Nodes: 6749595 NPS: 150024
>Time: 00:00:44.99
>depth=12 +7.69 d3h7 g8h8 d5h5 g7g5 h7e4 h8g7 h5h7 g7f6 h7h6 e7g6 e4g6 f8e8 g6h7
>f6e7 h6g5 f7f6 d1e1 e7d8 e1e8 d8e8 g5g8 e8e7 g8g7 e7e6 h7f5 e6d5 f5d7
>Nodes: 29448242 NPS: 146326
>Time: 00:03:21.25
>depth=12 +7.69 d3h7 g8h8 d5h5 g7g5 h7e4 h8g7 h5h7 g7f6 h7h6 e7g6 e4g6 f8e8 g6h7
>f6e7 h6g5 f7f6 d1e1 e7d8 e1e8 d8e8 g5g8 e8e7 g8g7 e7e6 h7f5 e6d5 f5d7
>Nodes: 30294725 NPS: 146492
>Time: 00:03:26.80
>
>Only after Rxe7 Rxe7?? movei can see the mate
>
>depth=7 +99.89 d3h7 g8h8 d5h5 g7g6 h7g6 h8g7 h5h7 g7f6 g4g5 f6e6 g6f5
>Nodes: 116023 NPS: 139786
>Time: 00:00:00.83
>
>or after Rxe7 Nxe7? Bxh7+ Kxh7?
>
>depth=6 +99.87 d5h5 h7g8 f3g5 f8d8 h5h7 g8f8 h7h8 e7g8 g5h7 f8e8 h8g8 e8e7 d1e1
>Nodes: 20761 NPS: 129756
>Time: 00:00:00.16
>
>Uri
Correct. My mistake. It would indeed take either of those 2 blunders to
force a mate in x.
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