Author: Howard Exner
Date: 00:32:54 08/15/98
Go up one level in this thread
On August 15, 1998 at 03:29:04, Howard Exner wrote: >On August 14, 1998 at 02:39:43, Frank Schneider wrote: > >>Hi all! >> >>There are many testsuites where a best move has to be found and >>I'm satisfied with the results Gromit gets. However, when playing >>real games most losses are caused by making bad moves (and not by not >>playing good moves). >> >>Is there a testsuite with positions where programs have find out that >>a good-looking move is bad? >> >>Is there a testsuite where the best move does not win but is the only >>move to assure a draw? >> >>Frank > >Here are a few positions where moves that appear good should be avoided. >In every case playing the am (avoid move) will result in either missing >a win or turning a draw into a loss. > >8/7p/R7/7k/8/p5K1/8/r7 b - - am a3a2; >Q6n/8/8/8/8/6K1/pk6/8 w - - am Qxh8; >8/1Q5n/8/8/8/2p5/7K/2k5 w - - am Qxh7; >1kb5/8/p1p3p1/Pp1p1p1p/1P1P3P/5PP1/2PN4/5K2 w - - am=f3f4; >8/5p2/p3p1p1/1pbkP2p/5P1P/1P4P1/P3KB2/8 w - - am Bxc5; >1r6/5k2/p4p1K/5R2/7P/8/6P1/8 w - - am Kh5; >8/6p1/1p5p/1R2k3/4p3/1P2P3/1K4PP/3r4 b - - am Rd5; >8/8/6p1/3Pkp2/4P3/2K5/6P1/n7 w - - am e4f5; bm d6; >8/8/6p1/3PkP2/8/2K5/6P1/n7 b - - am=g6f5; bm Kxf5; > >The first position will be the hardest for computers. The winning plan is >to move the black king towards the a6 pawn. sorry, that should be the a3 pawn. > >The next two are routine draws for those familiar with the draws >of the rook and bishop pawns. I believe the ChessMaster programs >avoid capturing the Knight in these two examples immediately. So >de Koning must have included code for these. On todays faster hardware >many programs will probably just calculate a win by avoiding the >knight captures even without the knowledge code. > >The last two problems I now give Rebel 8 a tough time. Try number >nine before number 8 as number 9 is one ply after.
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