Author: Uri Blass
Date: 04:46:36 01/05/02
Go up one level in this thread
On January 05, 2002 at 07:29:52, Gian-Carlo Pascutto wrote: >>The mate in the second position is too long and not relevant >>for practical games. > >A mate is a mate. I do not see how finding a long mate is >not practical and finding a short one suddely is. > >If so, what is the limit? Mate in 15 ? Mate in 16? > >-- >GCP I think that mates in more than 20 moves that can be practically proved are rare in practical games if you do not use tablebases. I think that chessmaster is one of the best in finding mates from practical games when tablebases are not involved. It may be interesting to do a competition of finding mates in the middle game between programs based on the ssdf games when there are at least 16 pieces on the board so we can hope that tablebases are not going to help much. I expect chessmaster to be best in most of the positions. Here is the first position for this competition Sphinx Dominator - MChess 486 [D]1r4k1/5pp1/6bp/p7/PpP1n3/1Q1p2PP/1P3qBK/N2R4 b - - 0 1 Analysis by Yace 0.99.56: 31...Qxg2+ 32.Kxg2 +- (4.94) Depth: 1 00:00:00 31...Nxg3 -+ (-2.69) Depth: 1 00:00:00 31...Qxg3+ 32.Kh1 -+ (-3.00) Depth: 1 00:00:00 31...Qxg3+ 32.Kg1 Rd8 -+ (-3.10) Depth: 2 00:00:00 31...Qxg3+ 32.Kg1 Nf2 33.Rf1 Nxh3+ -+ (-3.92) Depth: 3 00:00:00 31...Qxg3+ 32.Kg1 Nf2 33.Re1 -+ (-3.95) Depth: 3 00:00:00 31...Qxg3+ 32.Kg1 Qe3+ 33.Kh2 Qf4+ 34.Kg1 Nd2 35.Qa2 -+ (-4.02) Depth: 4 00:00:00 31...Qxg3+ 32.Kg1 Nc5 33.Qa2 Bf5 34.Kf1 -+ (-4.32) Depth: 5 00:00:00 17kN 31...Qxg3+ 32.Kg1 Qf2+ 33.Kh1 Qe2 34.Rxd3 Qxd3 35.c5 -+ (-4.72) Depth: 6 00:00:00 114kN 31...Qxg3+ 32.Kg1 Qf2+ 33.Kh1 Qe2 34.Rb1 Nd2 35.Qd1 Nxb1 36.Qxb1 -+ (-4.79) Depth: 6 00:00:00 114kN 31...Qxg3+ 32.Kg1 Qf2+ 33.Kh1 Qe2 34.Rb1 d2 35.Qxb4 axb4 36.Bxe4 -+ (-5.19) Depth: 7 00:00:00 161kN 31...Qxg3+ 32.Kg1 Nc5 33.Qa2 d2 34.Qa3 bxa3 35.bxa3 -+ (-6.19) Depth: 7 00:00:00 161kN 31...Qxg3+ 32.Kg1 Nc5 33.Qa2 d2 34.Nb3 Nxb3 35.Rf1 Be4 -+ (-6.66) Depth: 7 00:00:00 161kN 31...Qxg3+ 32.Kg1 Qf2+ 33.Kh2 Nd2 34.Rxd2 Qxd2 35.Kg1 Qe3+ 36.Kh2 Qf4+ 37.Kg1 Qc1+ 38.Qd1 Qxd1+ 39.Kh2 -+ (-7.06) Depth: 8 00:00:01 481kN 31...Qxg3+ 32.Kg1 Qf2+ 33.Kh2 Nd2 34.Rxd2 Qxd2 35.Kg3 Qe1+ 36.Kh2 Qe5+ 37.Kg1 Qxb2 38.Qxb2 Bh5 -+ (-7.84) Depth: 8 00:00:01 527kN 31...Nxg3 32.Rxd3 Ne2 33.Qd1 Bxd3 34.c5 Qxc5 35.Qxd3 Qc7+ 36.Qd6 Qxd6+ 37.Kh1 -+ (-7.85) Depth: 8 00:00:02 1059kN 31...Nxg3 32.Rxd3 Ne2 33.Qd1 Bxd3 34.Qf1 Qg3+ 35.Kh1 Nf4 36.Qf3 -+ (-8.24) Depth: 8 00:00:02 1059kN 31...Nxg3 32.Rxd3 Ne2 33.Qd1 Bxd3 34.Qf1 Qg3+ 35.Kh1 Bxc4 36.Qf3 Qe1+ 37.Qf1 -+ (-8.34) Depth: 9 00:00:04 2028kN 31...Qxg3+ 32.Kg1 Qf2+ 33.Kh2 Nd2 34.Rxd2 Qxd2 35.Kg3 Qe1+ 36.Kh2 d2 37.Qxb4 axb4 38.Bf1 -+ (-8.35) Depth: 9 00:00:04 2028kN 31...Qxg3+ 32.Kg1 Nf2 33.Rf1 Nxh3+ 34.Kh1 Qh4 35.Bxh3 Qxh3+ 36.Kg1 Qe3+ 37.Kh2 Qe2+ 38.Kg1 Qg4+ 39.Kh2 Be4 40.Qc2 dxc2 41.Nxc2 -+ (-9.64) Depth: 9 00:00:07 3431kN 31...Qxg3+ 32.Kg1 Ng5 33.Kf1 Rb6 34.Bf3 Nxf3 35.Qc3 bxc3 36.Rd2 -+ (-14.64) Depth: 9 00:00:11 5449kN 31...Qxg3+ 32.Kg1 Ng5 33.Nc2 Nxh3+ 34.Kh1 Nf2+ 35.Kg1 Nxd1 -+ (-14.64) Depth: 9 00:00:11 5449kN 31...Qxg3+ 32.Kg1 Ng5 33.Nc2 Nxh3+ 34.Kh1 Nf2+ 35.Kg1 Nxd1 36.Ne1 Re8 37.Nc2 Qxg2+ 38.Kxg2 dxc2 39.Kh3 c1Q -+ (-15.04) Depth: 10 00:00:14 6847kN 31...Qxg3+ 32.Kg1 Ng5 33.Nc2 Nxh3+ 34.Kh1 Nf2+ 35.Kg1 Be4 36.Ne1 Ng4 37.Qc2 dxc2 38.Kf1 cxd1Q 39.Bxe4 -+ (-16.04) Depth: 10 00:00:14 6891kN 31...Qxg3+ 32.Kg1 Ng5 33.Rxd3 Bxd3 34.Qd1 Be4 35.Qg4 Nf3+ 36.Qxf3 Bxf3 37.Kf1 Qxg2+ 38.Ke1 -+ (-18.72) Depth: 10 00:00:20 9694kN 31...Qxg3+ 32.Kg1 Ng5 33.Qxb4 axb4 34.Kf1 Be4 35.Rd2 Re8 36.Nc2 dxc2 37.Kg1 c1Q+ 38.Rd1 -+ (-19.12) Depth: 11 00:00:31 16324kN 31...Qxg3+ 32.Kg1 Ng5 33.Rxd3 Bxd3 34.Qd1 Nxh3+ 35.Kh1 Nf2+ 36.Kg1 Nxd1 37.Nb3 Qe3+ 38.Kh2 -+ (-19.61) Depth: 11 00:00:45 23928kN 31...Qxg3+ 32.Kg1 Ng5 33.Rxd3 Bxd3 34.Qc3 bxc3 35.Nc2 -+ (-20.01) Depth: 12 00:01:10 37280kN 31...Qxg3+ 32.Kg1 Ng5 33.Qxd3 Nxh3+ 34.Kh1 Nf2+ 35.Kg1 Nxd3 36.Rd2 Qe1+ 37.Kh2 Qxd2 38.c5 Nxc5 39.Kh1 Qxb2 40.Ba8 -+ (-21.01) Depth: 12 00:01:13 39564kN 31...Qxg3+ 32.Kg1 Ng5 33.Kf1 Nxh3 34.Qc2 dxc2 35.Rb1 -+ (-26.01) Depth: 12 00:01:14 40170kN 31...Qxg3+ 32.Kg1 Ng5 33.Rxd3 Bxd3 34.Qxd3 Nxh3+ 35.Kh1 Nf2+ 36.Kg1 Nxd3 -+ (-#11) Depth: 12 00:03:39 138282kN (Blass, Tel-aviv 05.01.2002) Uri
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