Author: John Merlino
Date: 15:21:03 05/02/05
Go up one level in this thread
On May 02, 2005 at 15:44:39, Dann Corbit wrote: >On May 01, 2005 at 15:18:05, John Merlino wrote: > >>On May 01, 2005 at 12:35:59, chandler yergin wrote: >> >>>I think someone posted this position as 'the grind'? >>> >>>Shredder finds the Mate. >>> >>>[D]1rb3kr/p2q1ppp/1p1N4/3QPP2/8/8/P1P3PP/1R3R1K w >>> >>>.e6 Qc7 2.exf7+ Kf8 3.Rbe1 g6 4.fxg6 Be6 >>> +- (5.66) Depth: 7/21 00:00:45 54kN >>>1.e6 Qc7 2.exf7+ Kf8 3.Rbe1 Bb7 4.Re8+ Rxe8 5.fxe8Q# >>> +- (6.16) Depth: 7/21 00:00:47 62kN >>>1.e6 Qc7 2.exf7+ Kf8 3.Rbe1 Bd7 4.Qe5 Qd8 5.f6 g6 >>> +- (6.44) Depth: 7/29 00:00:49 77kN >>>1.e6 Qc7 2.exf7+ Kf8 3.Rbe1 Bd7 4.Qe5 Qd8 5.f6 Qe7 6.Qxe7# >>> +- (6.69) Depth: 8/22 00:00:55 100kN >> >>See this thread: >> >>http://www.talkchess.com/forums/1/message.html?423252 >> >>As you can see, it is a mate in approximately 15 moves, and you are yet another >>victim of Shredder's deceptive (or, as I like to put it, "totally wrong") PVs >>and/or evals. > >Many programs will cough up a pound sign in the principal variation and yet >not show a mate score. > >The depth of search above is 8 plies, and so these moves: >... 5.f6 Qe7 6.Qxe7# >are obviously speculative. Ok, I'll believe you, but I still don't get WHY. A program should not show a mating line in a PV if the mate is not forced, IMHO. >On the other hand, when a program does show a mate _score_ when there is no >mate, that is clearly a bug. Which Shredder also does.... jm
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