Author: Ed Schröder
Date: 12:35:38 07/22/00
Go up one level in this thread
On July 22, 2000 at 13:41:06, blass uri wrote: >[D]r3rk2/1p6/2p3P1/4nP1p/pP2p3/P1B1NbPB/2P5/5RK1 w - - 0 1 > >Deeeper blue planned to go to this position in move 37 but did not do it > >at depth 7(6) after 3 seconds it planned to play Rd8-a8 in order to get this >position with evaluation of -24 > >Rd8-a8 failed low at depth 8(6) and deeper blue got evaluation of -54 > >Deeper blue solved the fail low problem with evaluation of -98 and changed its >mind to another move b5 with clearly better evaluation. > >It is interesting to compare evaluation of programs after b5(the move that was >played) and after Rd8-a8 the move that was not played to see if Deeper blue had >a good reason to fail low. > >Uri For what it is worth, running Century 2.0 I get this...... [d]3rrk2/1p6/2p3P1/4nP1p/pP2p3/P1B1NbPB/2P5/5RK1 b - - 00:01 08.00 0.28 1..b5 2.Bg2 Kg7 3.Bxf3 exf3 4.Rxf3 Kf6 5.Rf1 Re7 00:02 08.04 0.37 1..b6 2.Rf2 b5 3.Rd2 Rxd2 4.Bxd2 Bg4 5.Kg2 Bxh3+ 6.Kxh3 00:05 09.00 0.31 1..b6 2.Bg2 Ng4 3.Nxg4 hxg4 4.f6 Rd5 5.Re1 Red8 6.Kf2 00:10 10.00 0.25 1..b6 2.Re1 b5 3.Bg2 Rd7 4.Bxe5 Bxg2 5.Bf4 Bf3 6.f6 00:29 11.00 0.22 1..b6 2.Rf2 b5 3.Rd2 Rxd2 4.Bxd2 Rd8 5.Bc3 Ng4 6.Bxg4 Bxg4 7.f6 Be6 8.Kf2 Rd3 00:34 11.01 0.30 1..b5 2.Rf2 Kg7 3.g4 Kh6 4.Bd2 Kg5 5.gxh5 Bxh5 6.Kf1 00:56 12.00 0.23 1..b5 2.Rf2 Kg7 3.g4 Kh6 4.Bd2 Kg5 5.Nd5+ Kh4 6.Nf6 Rf8 02:32 13.00 0.29 1..b5 2.Rf2 Kg7 3.g4 Kh6 4.Bd2 Kg5 5.gxh5 Bxh5 6.Rg2+ Kf6 7.Bc3 04:41 14.00 0.27 1..b5 2.Rf2 Rd6 3.Rd2 Rxd2 4.Bxd2 Kg7 5.Bc3 Kf6 6.g4 hxg4 7.Bxg4 Kg5 No sign of 37..Ra8 (which goes beyond my understanding) After moving the rook to a8 I also get nothing to be excited about... [d]r3rk2/1p6/2p3P1/4nP1p/pP2p3/P1B1NbPB/2P5/5RK1 w - - 00:01 07.01 -0.04 1.Bxe5 Rxe5 2.Nc4 Ree8 3.Nd6 Red8 4.Nxb7 Rd2 00:01 08.00 0.30 1.Bxe5 Rxe5 2.Nc4 Ree8 3.f6 Rad8 4.Nb6 Bg4 5.Bxg4 hxg4 00:02 09.00 0.18 1.Bxe5 Rxe5 2.Nc4 Rb5 3.Nd2 Rd8 4.Nxf3 exf3 5.Rxf3 Rbd5 6.f6 Rd2 00:05 10.00 0.12 1.Bxe5 Rxe5 2.Nc4 Rb5 3.Nd2 Re8 4.Nxf3 exf3 5.Rxf3 Rbe5 6.f6 Re1 00:12 11.00 0.02 1.Bxe5 Rxe5 2.Nc4 Rb5 3.Nd2 Re8 4.Nxf3 exf3 5.f6 Rg5 6.g7 Kf7 7.Rxf3+ Re1+ 8.Kg2 01:23 11.11 0.03 1.b5 Be2 2.Rf4 Bxb5 3.g4 hxg4 4.Nxg4 Nf3+ 5.Kh1 Re7 6.g7+ Rxg7 7.Bxg7+ Kxg7 8.Rxe4 Kf7 02:29 12.00 0.18 1.b5 Be2 2.Rf4 Rad8 3.bxc6 bxc6 4.Bxe5 Rxe5 5.Bg2+ Kg7 6.Kf2 Bb5 7.Bxe4 02:33 12.01 0.18 1.Bxe5 02:37 12.01 0.52 1.Bxe5 Rxe5 2.Nc4 Ree8 3.Nd6 Re5 4.f6 Rb8 5.Nf7 Rb5 6.c4 Rb6 02:57 13.00 0.21 1.Bxe5 Rxe5 2.Nc4 Rb5 3.Nd6 Rd5 4.Nxb7 Kg7 5.Nc5 Rd2 6.Re1 Re8 7.Ne6 Kf6 05:30 13.01 0.21 1.b5 Rab8 2.Rb1 c5 3.Nd5 Bg4 4.Bxg4 Nxg4 5.b6 Red8 6.Nf4 15:00 14.00 0.24 1.b5 Rab8 2.Rb1 c5 3.Nd5 Bg4 4.Bxg4 Nxg4 5.b6 e3 6.Nc7 Re4 15:32 14.01 0.36 1.Bxe5 Rxe5 2.Nc4 Rb5 3.f6 Rg5 4.g7+ Kf7 5.Nd6+ Kg6 6.Be6 Rxg3+ 7.Kf2 h4 Note that this position is full of giant positional scores because of white's strong passed pawns and a fail-low may easily occur due to positional scores than to a material loss. Ed
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