Author: Terry McCracken
Date: 17:36:20 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 I tried the CB version again and it seemed the learning feature of the CB ver. cleared itself? Odd? This time Shredder 6 took longer with 1'.26" appox. and Shredder 6.02 took 2'.08" to solve for Rxg7! Shredder 6.02 - McCracken,T 6R1/1p1r2p1/p3k1Pp/P2pP2K/2pP4/2P5/1P6/8 w - - 0 1 Analysis by Shredder 6.02: 1.b4 cxb3 -+ (-2.14) Depth: 1/2 00:00:00 1.b4 cxb3 -+ (-1.91) Depth: 1/2 00:00:00 1.Kg4 = (-0.16) Depth: 1/2 00:00:00 1.Kg4 ² (0.56) Depth: 1/2 00:00:00 1.Kg4 ² (0.56) Depth: 1/2 00:00:00 1.Rxg7 Rxg7 ² (0.64) Depth: 1/2 00:00:00 1.Rxg7 Rxg7 2.Kxh6 ² (0.64) Depth: 1/2 00:00:00 1.Rxg7 Rxg7 2.Kxh6 µ (-0.95) Depth: 2/4 00:00:00 1.Rxg7 Rxg7 2.Kxh6 -+ (-1.91) Depth: 2/4 00:00:00 1.Rxg7 Rxg7 2.Kxh6 -+ (-4.12) Depth: 2/4 00:00:00 1.b4 cxb3 -+ (-2.15) Depth: 2/4 00:00:00 1.b4 cxb3 -+ (-2.15) Depth: 2/4 00:00:00 1.Kg4 b5 -+ (-1.72) Depth: 2/4 00:00:00 1.Kg4 h5+ 2.Kxh5 ³ (-0.60) Depth: 2/4 00:00:00 1.Kg4 Re7 ² (0.54) Depth: 2/4 00:00:00 1.Kg4 Re7 2.Kf4 ² (0.45) Depth: 3/6 00:00:00 1.Kg4 Re7 2.Rb8 Rc7 ± (0.73) Depth: 4/8 00:00:00 1.Kg4 Re7 2.Rb8 Rc7 ± (0.73) Depth: 4/8 00:00:00 1.Kg4 Re7 2.Rb8 Rc7 3.Re8+ Re7 4.Rb8 Rc7 5.Re8+ Re7 6.Rb8 Rc7 ² (0.66) Depth: 5/10 00:00:00 1.Kg4 Re7 2.Kf4 Rd7 3.Rh8 Re7 ² (0.61) Depth: 6/12 00:00:00 1.Kg4 Re7 2.Kf4 Rd7 3.Re8+ Re7 4.Rh8 Kd7 ² (0.70) Depth: 7/14 00:00:00 4kN 1.Kg4 Re7 2.Kf4 Rc7 3.Rh8 Rf7+ 4.gxf7 Kd7 5.f8Q ² (0.69) Depth: 8/16 00:00:00 9kN 1.Kg4 Re7 2.Kf4 Rc7 3.Re8+ Kd7 4.Rf8 Ke6 5.Kf3 Rc6 ² (0.68) Depth: 9/18 00:00:00 16kN 1.Kg4 Re7 2.Kf4 Rc7 3.Re8+ Kd7 4.Rf8 Ke6 5.Kg4 Re7 6.Rf7 ² (0.68) Depth: 10/20 00:00:00 27kN 1.Kg4 Re7 2.Kf4 Rc7 3.Re8+ Kd7 4.Rf8 Ke6 5.Rg8 Re7 ± (0.71) Depth: 11/22 00:00:00 43kN 1.Kg4 Re7 2.Kf4 Rc7 3.Re8+ Re7 4.Rf8 Rc7 5.Rg8 Re7 ² (0.70) Depth: 12/24 00:00:01 68kN 1.Kg4 Re7 2.Kf4 Rc7 3.Re8+ Re7 4.Rf8 Rc7 5.Rg8 Re7 ² (0.68) Depth: 13/25 00:00:01 103kN 1.Kg4 Re7 2.Kf4 Rc7 3.Re8+ Re7 4.Rf8 Rc7 5.Rg8 Re7 ² (0.68) Depth: 14/26 00:00:01 156kN 1.Kg4 Re7 2.Kf4 Rc7 3.Re8+ Re7 4.Rf8 Rc7 5.Rg8 Re7 6.Ke3 ² (0.68) Depth: 15/27 00:00:02 225kN 1.Kg4 Rc7 2.Kf4 Kd7 ² (0.62) Depth: 16/28 00:00:05 871kN 1.Kg4 Rc7 2.Kf4 Re7 3.Rd8 Rd7 4.Ra8 Re7 5.Rg8 Rc7 6.Re8+ Re7 7.Rd8 Rd7 8.Ra8 Re7 9.Rg8 Rc7 10.Re8+ Re7 11.Rd8 Rd7 ² (0.63) Depth: 17/29 00:00:09 1446kN 1.Kg4 Rc7 2.Kf4 Re7 3.Rf8 Rd7 4.b4 cxb3 5.Kg3 Re7 6.Rf7 Rxf7 7.gxf7 Kxf7 8.e6+ Kxe6 9.Kf3 ² (0.64) Depth: 18/30 00:00:13 2023kN 1.Kg4 Rc7 2.Kf4 Re7 3.Rf8 Rd7 4.Ke3 Re7 5.Ra8 Rd7 6.Kf4 ² (0.63) Depth: 19/31 00:00:23 3727kN 1.Kg4 Rc7 2.Kf4 Re7 3.Rf8 Rd7 4.Ke3 Re7 5.Ra8 Rd7 6.Kf4 ² (0.63) Depth: 20/32 00:00:38 5628kN 1.Kg4 Rc7 2.Kf4 Re7 3.Rf8 Rd7 4.Re8+ Re7 5.Rg8 Rc7 6.Re8+ Re7 7.Rg8 Rc7 8.Re8+ Re7 9.Rg8 ² (0.63) Depth: 21/33 00:01:14 10455kN 1.Rxg7 Rxg7 2.Kxh6 Re7 3.g7 Kf7 4.Kh7 Re8 5.e6+ Ke7 6.g8Q Rxg8 7.Kxg8 Kxe6 8.Kg7 b5 9.Kg6 b4 10.cxb4 Ke7 11.b5 axb5 12.Kg7 Ke8 ² (0.64) Depth: 21/33 00:02:08 17458kN (McCracken, None 12.06.2002) Shredder 6 - McCracken,T 6R1/1p1r2p1/p3k1Pp/P2pP2K/2pP4/2P5/1P6/8 w - - 0 1 Analysis by Shredder 6: 1.b4 cxb3 = (0.22) Depth: 1/2 00:00:00 1.b4 cxb3 -+ (-2.04) Depth: 1/2 00:00:00 1.b4 cxb3 -+ (-1.50) Depth: 1/2 00:00:00 1.Kg4 ³ (-0.36) Depth: 1/2 00:00:00 1.Rxg7 Rxg7 ± (0.79) Depth: 1/2 00:00:00 1.Rxg7 Rxg7 ± (0.79) Depth: 1/2 00:00:00 1.Rxg7 Rxg7 ± (0.79) Depth: 1/2 00:00:00 1.Rxg7 Rxg7 ± (0.79) Depth: 1/2 00:00:00 1.Rxg7 Rxg7 ± (0.79) Depth: 6/12 00:00:00 1.Rxg7 Rxg7 ± (0.79) Depth: 6/12 00:00:00 1.Rxg7 Rxg7 ± (0.79) Depth: 6/12 00:00:00 1.Rxg7 Rxg7 ± (0.79) Depth: 6/12 00:00:00 1.Rxg7 Rxg7 ± (0.79) Depth: 6/12 00:00:00 1.Rxg7 Rxg7 ± (0.79) Depth: 7/14 00:00:00 1kN 1.Rxg7 Rxg7 ± (0.79) Depth: 8/16 00:00:00 3kN 1.Rxg7 Rxg7 ± (0.79) Depth: 9/18 00:00:00 5kN 1.Rxg7 Rxg7 ± (0.79) Depth: 10/20 00:00:00 9kN 1.Rxg7 Rxg7 2.Kxh6 ± (0.79) Depth: 11/22 00:00:00 15kN 1.Rxg7 Rxg7 2.Kg4 ± (0.79) Depth: 12/24 00:00:00 24kN 1.Rxg7 Rxg7 2.b4 cxb3 3.Kg4 ± (0.79) Depth: 13/25 00:00:00 41kN 1.Rxg7 Rxg7 2.b4 cxb3 3.Kg4 ± (0.79) Depth: 14/26 00:00:01 62kN 1.Rxg7 Rxg7 2.Kxh6 Rd7 3.b4 ± (0.79) Depth: 15/27 00:00:01 95kN 1.Rxg7 Rxg7 2.Kg4 ± (0.79) Depth: 16/28 00:00:01 140kN 1.Rxg7 Rxg7 2.Kg4 ± (0.79) Depth: 17/29 00:00:02 214kN 1.Rxg7 Rxg7 2.Kg4 ± (0.79) Depth: 18/30 00:00:03 395kN 1.Kg4 Re7 2.Kf4 Rd7 3.Rf8 Rc7 ± (0.80) Depth: 18/30 00:00:13 1870kN 1.Kg4 Re7 2.Kf4 Rd7 3.Rf8 Rc7 4.Rb8 Re7 5.b4 cxb3 6.Rxb7 Rxb7 7.c4 dxc4 8.Kg4 h5+ 9.Kxh5 Rb5 ± (0.85) Depth: 18/30 00:00:16 2240kN 1.Kg4 Re7 2.Rf8 Rd7 3.Rf7 Rxf7 4.b3 ± (0.82) Depth: 19/31 00:00:22 3447kN 1.Kg4 Re7 2.Rf8 Rd7 3.Kf4 Re7 4.Rg8 ± (0.81) Depth: 20/32 00:00:36 5507kN 1.Kg4 Re7 2.Rf8 Rd7 3.Kf4 Re7 4.Rg8 ± (0.76) Depth: 21/33 00:01:12 12756kN 1.Rxg7 ± (0.79) Depth: 21/33 00:01:26 14713kN 1.Rxg7 ± (0.79) Depth: 21/33 00:01:26 14713kN 1.Rxg7 ± (0.79) Depth: 22/34 00:01:26 14713kN (McCracken, None 12.06.2002)
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