Author: Richard A. Fowell (fowell@netcom.com)
Date: 01:29:46 12/06/98
Go up one level in this thread
On December 06, 1998 at 01:25:32, Dan Istrate wrote: > I found these two positions in the manual for Diamond II and >tried to solve them with a Legend III. I've already posted some >conclusions two days ago. It seams to me that a computer with a >pretty strong program can have a very weak mate finder program. > Perhaps somebody else could try and solve these positions, >and then post the results here. If anybody has another Legend III >(or the Avenger - the travel version), please let me know if you >obtain the same results. > > Here are the two positions: > 1. White: Ka2;Qb1;Na3;Nd8;Bb8;Bf5;Pawns:e2,h2,a4,g5,d6,f6 > Black: Kd5;Nc5;Nd7;Pawn:a7 > > White to move and mate in 4 moves. In the manual, Novag >says that Diamond II needs 40 seconds to find Bxa7 and announce >mate in 3 more moves. If Diamond is set on normal playing levels >(I presume on the infinite level), it takes the computer only >11 seconds to find e2-e4 for a "mate in 5" solution. > > 2. White: Ka3;Ra8;Ng8;Pawn:h6 > Black: Kh8;Qh3;Be4;Bf6;Na5;Nh5;Pawns:c3,g3,c4,c5,e6,g6,h7 > > White to move and mate in 6 moves. Novag claims that Diamond II >needs 46 seconds to find Rb8 and mate in 6 moves. On normal playing >levels, a solution is found in a couple of hours. > > Dan I tried HIARCS 7 beta, Sigma Chess, MacChess on my Mac 7300/180 1B1N4/p2n4/3P1P2/2nk1BP1/P7/N7/K3P2P/1Q6 w - - bm bxa7; id "NovagM4"; R5Nk/7p/4pbpP/n1p4n/2p1b3/K1p3pq/8/8 w - - bm Rb8; id "NovagM6"; Summary: (times in seconds) Program Setting Problem 1 Problem 2 ------------------------------------------ Sigma 4 Matefind 3.9 4.1 HIARCS 7b Infinite - 11 (Problem 1 - mate in 5 - 2 seconds MacChess 4 Matefind 5 14 Sigma 4 Infinite 5 15 MacChess 5b Matefind 7 16 MacChess 5b Infinite - 17 (Problem 1 - mate in 5, < 1 second ============================ Details ============================ 1B1N4/p2n4/3P1P2/2nk1BP1/P7/N7/K3P2P/1Q6 w - - bm bxa7; id "NovagM4"; Sigma Chess 4.01 Lite finds mate in 3.9 seconds here in matefinder (5 seconds else) Bb8xa7 Nd7-f8 Nd8-f7 Nf8-d7 Qb1-d1 Kd5-c6 Nf7-d8 MacChess 4.0 found mate in 5 seconds: Bxa7 Kxd6 Nc4+ Kd5 Qe4+ Nxe4 Be6+ MacChess 5.0b6 found this in 7 seconds (only in matefinder mode - normal mode finds only the mate in 5 - a null-move thing, I expect. 06/04|00:00:07| 1411455|+M4 | Bxa7 Nxf6 Nc4 Kxc4 Qc2+ Kd4 Qxc5+ HIARCS 7.0 beta found only the mate in 5 (no matefinder mode) Second problem: R5Nk/7p/4pbpP/n1p4n/2p1b3/K1p3pq/8/8 w - - bm Rb8; id "NovagM6"; Sigma Chess 4.01 Lite finds mate in 4.1 seconds here (matefinder), 15 sec else. MacChess 5.0b6 - 16 seconds in matefinder mode, 17 seconds else. 11/01|00:00:16| 2755723|+M6 | Rb8 Be5 Rc8 Bb7 Rd8 Nc6 Re8 Ng7 Rf8 Ne7 Nxe7+ 12/01|00:00:17| 2555851|+M6 | Rb8 Be5 Rc8 Bb7 Rd8 Nc6 Re8 Ng7 Rf8 Ne7 Nxe7+ MacChess 4.0 - 14 seconds in matefinder mode, 31 seconds else. HIARCS 7.0 beta found this in 11 seconds in regular mode: 09 1.Rb8 Be5 Rc8 Bb7 Rd8 Mat+6
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