Author: James T. Walker
Date: 17:22:02 06/12/02
Go up one level in this thread
On June 12, 2002 at 19:59:59, Terry McCracken wrote: >On June 12, 2002 at 16:46:50, Ferdinand S. Mosca wrote: > >>While studying king and pawn ending, I have met this position. Both sides have >>protected passer, Black's rook is passive while white's rook is looking for >>weakneses. There is however a nice temporary sacrifice by white that is hidden, >>which brings the game to a won king and pawn game for white. The resulting KP >>game is not that easy to evaluate for many programs since either side has no >>passer, white's king is far from the center, white's pawn at a5 appears to be >>somewhat over extended and black's pawns are more advanced. There is at least 2 >>solution to this setup, first is to bring the rook to b-file which can >>simultaneously attacks both the black's king position and the backward black's >>b-pawn. The second solution is a more straight forward human touch, 51. Rxg7 >>that was played by the great GM Kasparov way back in 1998 on a simultaneous >>exhibition game against Groshenny. >>From initial test of some free engines only Yace can do 51. Rxg7. I have no >>Fritz 7 and Hiarcs 8 at the moment, will somebody also post the analysis of this >>two strong engines? >> >>Regards, >>Dinan >>[D]6R1/1p1r2p1/p3k1Pp/P2pP2K/2pP4/2P5/1P6/8 w - - 0 51 > > >The engine that solves this ending the fastest is Shredder 6! Shredder 6.02 >takes 2x longer! > >Shredder 6 see Rxg7! in approx. 1 min with 64MB of hash on a SLOW P-III 500! > >I'm sorry I didn't save the "Readout" and since Shredder "Learns" it will now >play it instantly. > >It surprises me the Shredder 6 beats Shredder 6.02, but whats more surprising is >the Shredder Classic ver. of Shredder Paderborn can't see Rxg7 after 3+ min.? > >Shredder 6 Classic again solves it within a minute, also 64MB for hash. > >Could someone who has Shredder 6 do this test again both using the ChessBase >ver. and the Classic ver., both for the readout and to verify that Shredder 6.02 >CB ver. is slower than Shredder 6 CB ver.; And that Shredder Paderborn Classic >is a "dud" on this position! > > >Regards, > Terry Shredder 6 Classic takes only 17 seconds on my Athlon 1.4G with 128 Meg hash. The Shredder Paderborn version takes 48 seconds but then loses it to Kg4 untill 3:30 when it picks up Rxg7 again. Engine: Shredder 6 by Stefan Meyer-Kahlen 16.01 0:01 +0.72 1.Kg4 Rc7 2.Re8+ Re7 3.Rb8 Rc7 4.Rg8 Rd7 5.b4 Rd6 (423.403) 406.7 17.01 0:01 +0.73 1.Kg4 Rc7 2.Re8+ Re7 3.Rb8 Rc7 4.Rg8 Rd7 5.b4 Rd6 (641.302) 420.2 18.01 0:02 +0.74 1.Kg4 Rc7 2.Re8+ Re7 3.Rb8 Rc7 4.Rg8 Rd7 5.b4 Rd6 (963.583) 428.0 19.01 0:03 +0.75 1.Kg4 Rc7 2.Re8+ Re7 3.Rb8 Rc7 4.Rg8 Rd7 5.b4 Rd6 (1.529.957) 435.7 20.01 0:05 +0.76 1.Kg4 Rc7 2.Re8+ Re7 3.Rb8 Rc7 4.Rg8 Rd7 5.b4 Rd6 (2.539.247) 437.3 21.01 0:09 +0.77 1.Kg4 Rc7 2.Re8+ Re7 3.Rb8 Rc7 4.Rg8 Rd7 5.b4 Rd6 (4.266.967) 441.6 21.04 0:17 +0.78++ 1.Rxg7 Rxg7 2.Kxh6 Re7 3.g7 Kf7 4.Kh7 Re8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 Kf6 8.Kf8 b5 9.axb6 a5 10.b4 Kg6 (7.048.041) 402.2 21.04 0:18 +0.81 1.Rxg7 Rxg7 2.Kxh6 Re7 3.g7 Kf7 4.Kh7 Re8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 Kf6 8.Kf8 Ke6 9.Kg7 Kf5 10.Kf7 Ke4 11.Ke6 b5 12.axb6 Kd3 13.Kxd5 Kc2 14.Kxc4 (7.564.829) 402.6 22.01 0:26 +0.91 1.Rxg7 Rxg7 2.Kxh6 Re7 3.g7 Kf7 4.Kh7 Re8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 Kf6 8.Kf8 Ke6 9.Ke8 Kd6 10.Kf7 Kd7 11.Kf6 Kd6 12.Kf5 Kc7 13.Ke5 Kd7 14.Kxd5 (10.732.553) 402.9 23.01 0:50 +1.16++ 1.Rxg7 Rxg7 2.Kxh6 Re7 3.g7 Kf7 4.Kh7 Re8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 Kf6 8.Kf8 Ke6 9.Ke8 Kf5 10.Kd7 Ke4 11.Kd6 Ke3 12.Kxd5 Kd2 13.Kxc4 b5+ 14.axb6 (19.139.689) 382.7 23.01 1:13 +1.66++ 1.Rxg7 Rxg7 2.Kxh6 Re7 3.g7 Kf7 4.Kh7 Re8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 Kf6 8.Kf8 Ke6 9.Ke8 Kf5 10.Kd7 Ke4 11.Kd6 Ke3 12.Kxd5 Kd2 13.Kxc4 b5+ 14.axb6 (28.035.436) 382.7 23.01 1:13 +1.66 1.Rxg7 Rxg7 2.Kxh6 Re7 3.g7 Kf7 4.Kh7 Re8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 Kf6 8.Kf8 Ke6 9.Ke8 Kf5 10.Kd7 Ke4 11.Kd6 Ke3 12.Kxd5 Kd2 13.Kxc4 b5+ 14.axb6 (28.248.169) 383.5 24.01 2:20 +1.91++ 1.Rxg7 Rxg7 2.Kxh6 Re7 3.g7 Kf7 4.Kh7 Re8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 Kf6 8.Kf8 Ke6 9.Ke8 Kf5 10.Kd7 Ke4 11.Kd6 Ke3 12.Kxd5 Kd2 13.Kxc4 b6 (51.420.647) 365.0 24.01 3:43 +2.41++ 1.Rxg7 Rxg7 2.Kxh6 Re7 3.g7 Kf7 4.Kh7 Re8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 Kf6 8.Kf8 Ke6 9.Ke8 Kf5 10.Kd7 Ke4 11.Kd6 Ke3 12.Kxd5 Kd2 13.Kxc4 Ke2 (79.793.385) 356.7 24.01 3:44 +2.41 1.Rxg7 Rxg7 2.Kxh6 Re7 3.g7 Kf7 4.Kh7 Re8 5.e6+ Kxe6 6.g8Q+ Rxg8 7.Kxg8 Kf6 8.Kf8 Ke6 9.Ke8 Kf5 10.Kd7 Ke4 11.Kd6 Ke3 12.Kxd5 Kd2 13.Kxc4 Ke2 (80.227.778) 357.1
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