Author: John Merlino
Date: 09:57:37 12/14/02
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On December 14, 2002 at 05:36:55, Sune Larsson wrote: > > [D]8/1pp5/p1p3pp/5k2/5P1P/P4KP1/1PPR4/5r2 w - - 0 8 > > The above position was reached between Fritz 8 - Aristarch, > in my ongoing rook ending tourney (Nunn1 position 40/60 minutes). > > Here Fritz played 8.Rf2? with a draw eval (+0.09). Ari happily > swapped rooks with -0.26 - followed up by playing Ke4,h5 and then > created weaknesses in the white Q-side. The king penetrated at the > right moment and black went on to win it. 0-1 > > The same thing happened in a very similar position vs Shredder PB. > (a3 wasn't played in that game). That one also ended 0-1. > The latent white breakthrough with g4,hxg,f5,gxf,h5 is not a guarantee > for a sure draw in the diagram position! CM9000, on a P3-733, never considers Rf2: Time Depth Score Positions Moves 0:00 1/5 0.07 4917 8.Ke2 Rg1 9.Kf2 Rb1 10.b3 0:00 1/6 0.10 14367 8.Ke2 Rg1 9.Kf2 Rh1 10.a4 Rh2+ 11.Ke3 Rxd2 12.Kxd2 0:00 1/7 0.05 37420 8.Ke2 Rh1 9.Rd7 Rh2+ 10.Kd1 Rg2 11.Rxc7 Rxg3 12.Rxb7 Kxf4 0:01 2/8 0.05 71264 8.Ke2 Rh1 9.Rd7 Rh2+ 10.Kd1 Rg2 11.Rxc7 Rxg3 12.Rxb7 Kxf4 0:02 3/9 0.04 172263 8.Ke2 Rb1 9.b3 Rh1 10.Rd7 Rh2+ 11.Kd1 Rg2 12.Rxc7 Rxg3 13.Rxb7 Kxf4 0:04 4/10 0.01 389446 8.Ke2 Rh1 9.Kf2 Rh2+ 10.Ke3 Rxd2 11.Kxd2 Ke4 12.b4 h5 13.Ke2 Kd4 14.a4 c5 0:06 4/10 0.09 570117 8.Kg2 Rb1 9.b3 Ra1 10.a4 Kg4 11.Re2 Rd1 12.Kf2 h5 0:10 5/11 0.08 913612 8.Kg2 Rb1 9.b3 Kg4 10.Re2 Rd1 11.Kf2 c5 12.a4 h5 13.Re5 0:20 6/12 0.06 1939133 8.Kg2 Rb1 9.b3 Kg4 10.Re2 Rc1 11.Kf2 h5 12.a4 Rh1 13.Re6 Rh2+ 14.Kg1 0:58 7/13 0.08 5515376 8.Kg2 Rb1 9.b3 Kg4 10.Re2 Rc1 11.Kf2 h5 12.b4 b5 13.Kg2 Rd1 14.Kh2 3:18 8/14 0.06 18844557 8.Kg2 Rb1 9.b3 b6 10.Kf3 Rf1+ 11.Ke2 Rc1 12.Kf2 Kg4 13.Re2 c5 14.Rd2 h5 15.c4 10:38 9/15 0.03 61583105 8.Kg2 Re1 9.Kf2 Rb1 10.b3 Kg4 11.Re2 Rb2 12.Kg2 c5 13.Rf2 c4 14.bxc4 Ra2 15.f5 Rxa3 16.Rf4+ Kh5 17.g4+ Kxh4 18.fxg6 jm
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