Author: Uri Blass
Date: 07:59:05 12/04/01
Go up one level in this thread
On December 04, 2001 at 10:37:46, Uri Blass wrote: >On December 04, 2001 at 09:58:50, Uri Blass wrote: > >>On December 03, 2001 at 21:05:39, Andrew Smith wrote: >> >>>[D]r1nq1r1k/p2b1pbp/1p4p1/2pNp3/RP1PP3/4BN1P/2P2PP1/2QR2K1 w KQkq - 0 1 >>> >>>dxe5!! apparently gives white a huge adavantage in this position, followed by >>>Bg5. The line looks to be very long. I played around the position with gambit >>>tiger and forced the move and followed its analysis some ten moves deep, until >>>it finally showed a positive score for white. According to this it would have >>>taken more than twenty plies (!?) in the original position. Can any program find >>>this move? Is it even possible? >> >>Yace only material analysis after dxe5 >>Bxa4(pawn=0.8,knight=3.4,bishop=3.5,rook=5,queen=10.01) >> >>The score at depth 13 is 2.60 against white >>The score at depth 15 is 1.60 against white >> >>I evaluate that depth 19 is going to be enough for it to see positive score for >>white but I do not promise to continue to analyze to this depth. >> >>New position >>[D]r1nq1r1k/p4pbp/1p4p1/2pNP3/bP2P3/4BN1P/2P2PP1/2QR2K1 w - - 0 1 >> >>Analysis by Yace 0.99.56: >> >>2.bxc5 >> -+ (-3.50) Depth: 1 00:00:09 >>2.bxc5 bxc5 >> -+ (-3.50) Depth: 2 00:00:09 >>2.bxc5 bxc5 3.Bxc5 Rg8 >> -+ (-3.50) Depth: 3 00:00:10 >>2.bxc5 bxc5 3.Bxc5 Rg8 4.Bd4 >> -+ (-3.50) Depth: 4 00:00:12 >>2.Bg5 Qxg5 3.Nxg5 Bxc2 >> -+ (-3.49) Depth: 4 00:00:14 >>2.Bg5 Qe8 3.Nc7 Qc6 >> -+ (-2.70) Depth: 4 00:00:14 >>2.Bg5 Qe8 3.Nc7 Qc6 4.Nxa8 >> -+ (-2.70) Depth: 5 00:00:16 9kN >>2.Bg5 Qe8 3.Nc7 Qc6 4.Nxa8 Qxa8 >> -+ (-2.70) Depth: 6 00:00:22 22kN >>2.bxc5 bxc5 3.Bxc5 Qe8 4.Bxf8 Kg8 >> -+ (-2.69) Depth: 6 00:00:34 52kN >>2.bxc5 Rb8 3.Nxb6 Qe8 4.Nxa4 Qxa4 >> -+ (-2.60) Depth: 6 00:00:35 59kN >>2.bxc5 Rb8 3.Nxb6 Qe8 4.Nxa4 Qxa4 5.Rd4 Qb5 >> -+ (-2.60) Depth: 7 00:00:42 121kN >>2.bxc5 Rb8 3.Nxb6 Qe8 4.Nxa4 Qxa4 5.Rd4 Qb5 6.Rd3 >> -+ (-2.60) Depth: 8 00:00:42 418kN >>2.bxc5 Qe8 3.Nc7 Qc6 4.Nxa8 Qxa8 5.cxb6 axb6 6.e6 fxe6 7.Ng5 >> -+ (-2.70) Depth: 9 00:00:44 1268kN >>2.bxc5 Rb8 3.Nxb6 Qe8 4.Nxa4 Qxa4 5.Bd4 Qb5 6.Nd2 f6 7.exf6 >> -+ (-2.60) Depth: 10 00:00:48 3140kN >>2.bxc5 Rb8 3.Nxb6 Qe8 4.Nxa4 Qxa4 5.Bd4 Qb5 6.Nd2 f6 7.exf6 Bxf6 >> -+ (-2.60) Depth: 11 00:00:55 8248kN >>2.bxc5 Rb8 3.Nxb6 Qe8 4.Nxa4 Qxa4 5.Bd4 Qb5 6.Nd2 f6 7.exf6 Bxf6 8.Bxf6+ Rxf6 >> -+ (-2.60) Depth: 12 00:01:25 27091kN >>2.bxc5 Rb8 3.Nxb6 Qe8 4.Nxa4 Qxa4 5.Bd4 Qb5 6.Nd2 f6 7.exf6 Bxf6 8.Bxf6+ Rxf6 >>9.Qa1 Qc6 >> -+ (-2.60) Depth: 13 00:02:53 80942kN >>2.bxc5 Rb8 3.Bg5 Qe8 4.Bf6 Qc6 5.Bxg7+ Kxg7 6.Nd4 Qd7 7.Nf5+ gxf5 8.Nf6 Bc6 >>9.Nxd7 Bxd7 >> -+ (-2.20) Depth: 14 00:08:09 263330kN >>2.bxc5 Qe8 3.Nc7 Qc6 4.Nxa8 Qxa8 5.cxb6 Nxb6 6.Re1 Bc6 7.Bc5 Rc8 8.Bxb6 axb6 >>9.Ng5 >> -+ (-2.00) Depth: 14 00:19:06 634895kN >>2.Bg5 Qe8 3.Bf6 Qc6 4.e6 fxe6 5.Bxg7+ Kxg7 6.Qa1+ Kg8 7.Nf6+ Rxf6 8.Qxf6 Nd6 >>9.Ne5 Nf7 10.Nxc6 Bxc6 >> -+ (-1.99) Depth: 14 00:20:50 694408kN >>2.Bg5 Qe8 3.Bf6 Qc6 4.e6 fxe6 5.Bxg7+ Kxg7 6.Qa1+ Kg8 7.Nf6+ Rxf6 8.Qxf6 Nd6 >>9.Ne5 Qc7 10.Qxe6+ Nf7 11.Rd7 Qxe5 >> -+ (-1.90) Depth: 14 00:21:37 721483kN >>2.Bg5 Qe8 3.Bf6 Qc6 4.e6 Qxe6 5.Bxg7+ Kxg7 6.Qa1+ f6 7.Qxa4 Rb8 8.bxc5 bxc5 >>9.Nc7 Qb6 10.c4 Kg8 11.Rd7 >> -+ (-1.60) Depth: 15 00:28:39 968855kN >> >>(Blass, Tel-aviv 04.12.2001) >> >> >>Uri > >Yace continues to get progress in score >Here is depth 16 results and suddenly it is only 1 pawn for black: > >2.Bg5 Qe8 3.Bf6 Qc6 4.e6 Qxe6 5.Qa1 Bxf6 6.Nxf6 Bxc2 7.Ng5 Qc4 8.Nfxh7+ f6 9.Rd8 >Kg8 10.Rxf8+ Kg7 > µ (-1.20) Depth: 16 00:48:11 1625444kN >2.Bg5 Qe8 3.Bf6 Qc6 4.e6 Qxe6 5.Qa1 Bxf6 6.Nxf6 Qc6 7.Nd7+ f6 8.Nxf8 Bxc2 9.Rd8 >Kg7 10.bxc5 bxc5 11.e5 > µ (-0.90) Depth: 16 01:01:57 2089740kN > >(Blass, Tel-aviv 04.12.2001) > >Uri Here is yace only material's opinion after going back(I did not give yace time to get a score at depth 17 and I prefered to take moves back) You can see that the score is also going up without dxe5 so I am not sure if the position is a good test position(yace can see only 0.1 for black and if the score continues to improve then it is possible that there is more then one winning move) New position [D]r1nq1r1k/p2b1pbp/1p4p1/2pNp3/RP1PP3/4BN1P/2P2PP1/2QR2K1 w - - 0 1 Analysis by Yace 0.99.56: 1.Nxb6 Nxb6 -+ (-2.70) Depth: 1 00:00:00 1.dxe5 Bxa4 2.Bg5 Qe8 3.Bf6 Qc6 4.e6 fxe6 5.Bxg7+ Kxg7 µ (-0.90) Depth: 1 00:00:00 1.Bg5 = (-0.10) Depth: 1 00:00:00 1.Bg5 Qe8 = (-0.10) Depth: 2 00:00:00 1.Bg5 f6 2.Nxb6 Bxa4 µ (-0.80) Depth: 3 00:00:00 1.Bg5 f6 2.Nxb6 Bxa4 3.Nxa8 fxg5 -+ (-2.00) Depth: 3 00:00:00 1.dxe5 Bxa4 2.Bg5 Qe8 3.Bf6 Qc6 4.e6 fxe6 5.Bxg7+ Kxg7 µ (-0.90) Depth: 3 00:00:00 1.dxe5 Bxa4 2.Bg5 Qe8 3.Bf6 Qc6 4.e6 fxe6 5.Bxg7+ Kxg7 µ (-0.90) Depth: 4 00:00:00 1.dxe5 Bxa4 2.Bg5 Qe8 3.Bf6 Qc6 4.e6 fxe6 5.Bxg7+ Kxg7 µ (-0.90) Depth: 5 00:00:00 12kN 1.dxe5 Bxa4 2.Bg5 Qe8 3.Bf6 Qc6 4.e6 fxe6 5.Bxg7+ Kxg7 µ (-0.90) Depth: 6 00:00:00 29kN 1.dxe5 Bxa4 2.Bg5 Qe8 3.Bf6 Qc6 4.e6 fxe6 5.Bxg7+ Kxg7 µ (-0.90) Depth: 7 00:00:00 93kN 1.dxe5 Bxa4 2.Bg5 Qe8 3.Bf6 Qc6 4.e6 fxe6 5.Bxg7+ Kxg7 µ (-0.90) Depth: 8 00:00:00 250kN 1.dxe5 Bxa4 2.Bg5 Qe8 3.Bf6 Qc6 4.e6 fxe6 5.Bxg7+ Kxg7 µ (-0.90) Depth: 9 00:00:01 879kN 1.dxe5 Bxa4 2.Bg5 Qe8 3.Bf6 Qc6 4.e6 fxe6 5.Bxg7+ Kxg7 µ (-0.90) Depth: 10 00:00:03 2451kN 1.dxe5 Bxa4 2.Bg5 Qe8 3.Bf6 Qc6 4.e6 fxe6 5.Bxg7+ Kxg7 µ (-0.90) Depth: 11 00:00:12 7934kN 1.dxe5 Bxa4 2.Bg5 Qe8 3.Bf6 Qc6 4.e6 fxe6 5.Bxg7+ Kxg7 µ (-0.90) Depth: 12 00:00:33 21512kN 1.Ra3 cxd4 2.Bh6 f6 3.Bxg7+ Kxg7 4.c3 dxc3 5.Nc7 Qxc7 6.Rxc3 Qxc3 7.Qxc3 Bxh3 µ (-0.89) Depth: 12 00:02:04 73105kN 1.Ra3 cxd4 2.Bh6 f6 3.Bxg7+ Kxg7 4.c3 dxc3 5.Nc7 Qxc7 6.Rxc3 Bc6 7.Rxc6 Qb8 8.Rc7+ Kh8 µ (-0.80) Depth: 12 00:02:13 78203kN 1.Ra3 cxd4 2.Bh6 Bxh6 3.Qxh6 f6 4.c3 Nd6 5.cxd4 exd4 6.Nxd4 Nxe4 7.Rda1 Bxh3 µ (-0.80) Depth: 13 00:03:33 124610kN 1.Ra1 cxd4 2.Bh6 f6 3.c3 dxc3 4.Nxf6 Rxf6 5.Nxe5 Bxh6 6.Qxh6 Rxf2 7.Kxf2 Bb5 µ (-0.79) Depth: 13 00:06:49 238215kN 1.Ra1 cxd4 2.Bh6 f6 3.c3 dxc3 4.Nxf6 Bxf6 5.Bxf8 Qxf8 6.Rxd7 Qxb4 7.Kh2 Qxe4 8.Qxc3 = (-0.10) Depth: 13 00:08:24 291226kN (Blass, Tel-aviv 04.12.2001) Uri
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