Author: Vincent Lejeune
Date: 13:33:19 04/30/05
Go up one level in this thread
On April 30, 2005 at 12:12:48, John Merlino wrote: >On April 30, 2005 at 08:57:14, Rob Basham wrote: > >>[D]rnb2rk1/pp2bppp/2p5/q7/4NN2/4B1QP/PPP3P1/2KR3R w - - 0 1 >> >>Any program find....Rd5....? >> >>All my programs just play Nd5... >> >>Rd5 attacks Queen and blocks the fifth file all in one move, >>so gains a tempo, permiting the next move Nh5..(after cxd5) etc. >> >>This could be a move that the computers just do not play. >> >>Rob > >The problem is that cxd5 is not required for Black. After 1.Rd5 Qc7! 2.Rh5, The >King (CM9_R1 on a P4-2.4) gives 2...Na6 an eval of about +0.9 for White after >three minutes, which isn't particularly exciting. > >After 2...Na6, the line might go 3.Bd4 f6 4.Qb3+ Rf7 5.Rf1 Qd7, and Black might >be able to hold. The eval at this position after three minutes is still in the >+0.9 range. after 1.Rd5 Qc7 2.Rh5 [d]rnb2rk1/ppq1bppp/2p5/7R/4NN2/4B1QP/PPP3P1/2K4R b - - 0 2 Shredder give a big + to white: Analysis by Shredder 9: ... 2...Ca6 3.Fd4 f6 4.Te1 Tb8 ± (1.17) Profondeur: 14/44 00:01:09 28712kN 2...Ca6 3.Fd4 +- (1.42) Profondeur: 15/42 00:01:32 38282kN 2...Ca6 3.Fd4 f6 4.Te1 c5 +- (1.42) Profondeur: 15/46 00:01:57 49601kN 2...Ca6 3.Fd4 +- (1.67) Profondeur: 16/43 00:02:48 71095kN 2...Ca6 3.Fd4 +- (2.17) Profondeur: 16/47 00:04:11 105670kN 2...Ca6 3.Fd4 f6 4.Te1 c5 5.Fc3 Fd8 6.Dh4 h6 7.Cd5 +- (3.60) Profondeur: 16/52 00:11:39 290929kN 2...Fd8 +- (3.59) Profondeur: 16/52 00:12:31 313838kN 2...Fd8 +- (3.24) Profondeur: 16/52 00:13:06 329391kN 2...Fd8 3.Fd4 f6 4.Fc5 Cd7 5.Fd6 Db6 6.Dd3 Da6 7.Dxa6 bxa6 8.Fxf8 Cxf8 9.Te1 Fc7 10.Cd3 Fe6 11.Cb4 +- (2.24) Profondeur: 16/52 00:15:48 390028kN 2...Fd8 3.Fd4 +- (2.49) Profondeur: 17/48 00:19:21 469806kN 2...Fd8 3.Fd4 +- (2.99) Profondeur: 17/51 00:20:42 495776kN 2...Fd8 3.Fd4 f6 4.Te1 Ca6 5.Cd6 Dxd6 6.Db3+ Fe6 7.Cxe6 Fa5 8.Cxf8+ Rxf8 9.c3 Dg3 +- (4.86) Profondeur: 17/56 00:44:54 1153465kN 2...Ca6 +- (4.85) Profondeur: 17/56 00:45:42 1178025kN 2...Ca6 +- (4.50) Profondeur: 17/56 00:48:08 1246632kN 2...Ca6 3.Fd4 f6 4.Te1 c5 5.Fc3 Fd8 6.Dh4 Cb4 7.Txh7 Dxf4+ 8.Dxf4 Cxa2+ 9.Rb1 Cxc3+ 10.Cxc3 Rxh7 11.Dh4+ Rg6 12.Cd5 Rf7 +- (3.85) Profondeur: 17/56 00:55:19 1432622kN 2...f6 +- (3.84) Profondeur: 17/56 00:56:11 1456866kN 2...f6 +- (3.49) Profondeur: 17/56 00:56:42 1472191kN 2...f6 3.Cd5 Dxg3 4.Cxe7+ Rf7 5.Cxg3 +- (3.49) Profondeur: 17/56 00:57:35 1495116kN 2...Td8 +- (3.48) Profondeur: 17/56 01:03:20 1651785kN 2...Td8 +- (3.13) Profondeur: 17/56 01:04:21 1683025kN 2...Td8 3.Cd5 Dxg3 4.Cxe7+ Rf8 5.Cxg3 Rxe7 6.Fc5+ Re8 7.Txh7 Fe6 8.Txg7 Ca6 +- (2.53) Profondeur: 17/56 01:09:08 1818978kN 2...Td8 3.Cd5 +- (2.78) Profondeur: 18/51 01:13:22 1937406kN 2...Td8 3.Te1 +- (2.78) Profondeur: 18/51 01:18:09 2071928kN 2...Td8 3.Te1 Fe6 4.Cd5 Dxg3 5.Cxe7+ Rf8 6.Cxg3 Rxe7 7.Txh7 Tg8 8.Fd4 c5 +- (2.54) Profondeur: 19/57 01:36:27 2543622kN 2...Td8 3.Te1 +- (2.79) Profondeur: 20/59 01:59:41 3146496kN 2...Td8 3.Te1 Fe6 4.Cd5 Dxg3 5.Cxe7+ Rf8 6.Cxg3 Rxe7 7.Cf5+ Rf6 8.Fg5+ Rg6 9.Fxd8 Rxh5 10.Cxg7+ Rg6 11.Cxe6 fxe6 12.Txe6+ Rf5 13.Tf6+ Re4 14.Tf7 Ca6 15.Ff6 Cb4 16.Txh7 +- (2.93) Profondeur: 20/59 02:12:38 3499864kN 2...Td8 3.Te1 Fe6 4.Cd5 Dxg3 5.Cxe7+ Rf8 6.Cxg3 Rxe7 7.Cf5+ Rf6 8.Fg5+ Rg6 9.Fxd8 Rxh5 10.Cxg7+ Rg6 11.Cxe6 fxe6 12.Txe6+ Rf5 13.Tf6+ Re4 14.Tf7 Ca6 15.Ff6 Cb4 16.Txh7 +- (3.08) Profondeur: 21/61 03:18:48 5213352kN > >However, 1.Nd5 will probably have an eval of around +2.5 for White, which is >much harder to ignore.... > >jm
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