Author: pete
Date: 13:02:52 07/07/99
Go up one level in this thread
On July 06, 1999 at 17:15:44, blass uri wrote: > >On July 06, 1999 at 13:33:01, Robert Hyatt wrote: > >>On July 04, 1999 at 06:19:17, Frank Schneider wrote: >> >>>On July 03, 1999 at 19:16:59, Gerrit Reubold wrote: >>> >>>>Hi all, >>>> >>>>please test your programs with the following position >>>> >>>>5rk1/1r3pp1/pp2pq2/3p4/3Q4/1PR5/P4PPP/4R1K1 w - - >>>> >>>>it is from a game which my program (Bringer) lost with white against The Crazy >>>>Bishop. The draw is very easy to see (for humans): Qxf6 gxf6, and then rook >>>>checks at h3, g3, f3... How long does your program take to find Qxf6 *with a >>>>draw score*. How many plies / seconds? Question to the programmers: What do you >>>>do to solve such positions fast? Extending on checks is not enough, my program >>>>needs a 12 ply search (8 minutes on a PII-300) to find the draw (Qxf6 is found >>>>earlier). >>>Gromit shows a drawscore after iteration 5 (1sec). >>> >>>Frank >>>> >>>>Greetings, >>>>Gerrit Reubold >> >> >>This is an evaluation issue. If your program thinks white is better, then it >>will see a draw. If your program likes black, then it will find that black >>doesn't _have_ to take the draw as the repetition is certainly not forced if >>black or white doesn't want to repeat. > >The repetition is forced. >It is a perpetual check. >I agree that a program can see the draw for the wrong reasons but it does not >change the fact that white has perpetual check after Qxf6 gxf6. > >Uri here I am disappointed ; this is a forced perpetual ; some progs see it , some don't , and although crafty usually is a good solver it has no clue about this position and goes for strange king manouevres like Kf1, Ke2 , etc even at long time controls ; crafty won't find this one at ply 15. some day there will be a programmer who admits something like this without strange eexcuses :); everybody here should know that not being able to understand a certain position doesn't say anything about the prog's overall strength. Pete
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