Author: John Merlino
Date: 19:01:20 02/27/03
Go up one level in this thread
On February 26, 2003 at 14:20:26, Steffen Jakob wrote: >Here is a position from Fritz 7 - Hossa: > >[D]1r6/R1K2pkp/B1R1p1b1/1P1p2P1/3P4/1r6/8/8 b - - 0 53 > >The Rb8 is attacked. I think every move to a square of the 8th rank loses >because white is able to push his b pawn (in the game Hossa played Rf8? and lost >quickly). > >How long does your favourite engine see that 53... R8xb5 or 53... R3xb5 draws? >My main line is 53... R8xb5 54. Bxb5 Rxb5 55. Rxe6 Rb4 56. Re8 h6 and black >looks pretty safe. > >Greetings, >Steffen. Chessmaster 9000, on a P3-733, chooses R8xb5 after 5 seconds: Time Depth Score Positions Moves 0:00 1/5 0.51 6943 53...Rh8 54.b6 h5 55.gxh6ep+ Kxh6 56.Bc8 Kg5 0:00 1/5 0.49 8607 53...Rg8 54.b6 h5 55.gxh6ep+ Kxh6 56.Bc8 0:00 1/5 0.40 12964 53...R8xb5 54.Bxb5 Rxb5 55.Rxe6 Rb4 56.Kc6 Rxd4 57.Rd7 0:00 1/5 0.15 18143 53...Re8 54.b6 e5 55.Kd7 Kf8 0:00 1/6 0.08 26193 53...Re8 54.b6 e5 55.dxe5 Rxe5 56.Rd6 Rxg5 0:02 1/7 0.27 77790 53...Re8 54.b6 e5 55.dxe5 Rxe5 56.Bc8 Be4 57.b7 d4 58.Rd6 0:04 1/8 0.31 231071 53...Re8 54.b6 f6 55.Kd6+ Bf7 56.Be2 Rf8 57.gxf6+ Kxf6 58.b7 Rd8+ 59.Kc7 0:05 1/8 0.26 297524 53...R8xb5 54.Bxb5 Rxb5 55.Rxe6 Rb4 56.Kc6 Rxd4 57.Rd6 Be4 58.Rdd7 Kg6 0:07 2/9 0.28 472347 53...R8xb5 54.Bxb5 Rxb5 55.Rxe6 Rb4 56.Re5 Rxd4 57.Kd6 h6 58.gxh6+ Kxh6 59.Rxd5 Rxd5+ 60.Kxd5 0:16 3/10 0.24 1258498 53...R8xb5 54.Bxb5 Rxb5 55.Rxe6 Rb4 56.Re8 h5 57.gxh6ep+ Kxh6 58.Kd6 Rxd4 59.Re5 f5 60.Rxd5 Rxd5+ 61.Kxd5 0:36 4/11 0.24 3145097 53...R8xb5 54.Bxb5 Rxb5 55.Rxe6 Rb4 56.Re8 h5 57.gxh6ep+ Kxh6 58.Kd6 Rxd4 59.Re5 f5 60.Rxd5 Rxd5+ 61.Kxd5 1:29 5/12 0.21 8421700 53...R8xb5 54.Bxb5 Rxb5 55.Rxe6 Rb4 56.Kc6 Rxd4 57.Kc5 Rd2 58.Rd6 Rc2+ 59.Kxd5 Rg2 60.Kd4 Rg4+ 61.Ke3 Rxg5 jm
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