Author: Robert Hyatt
Date: 07:34:01 06/20/01
Go up one level in this thread
On June 20, 2001 at 04:36:44, Uri Blass wrote: >I use the perft command in crafty in order to debug my move generator. > >I found that perft 4 gave me correct result when perft 5 does not give me >correct result and I got 4865621 instead of 4865609. > >After finding it >I calculated the perft 4 after every legal move and found that perft 4 does not >give correct result after 1.d3 > >After finding it I checked perft 3 after d3 to see where my program is wrong and >found that after 1.d3 c5 I got 15972 instead of 15971. > >I now need to continue in this way to check where is the error. > >Is there a faster way to debug the move generator? > >Did other programmers use the perft command in Crafty to debug their move >generator? > >Are there some small test games to test the move generator at small depthes(I >did not imlement undo function or setup position) > >I can give some from my own experience that I corrected > >1.a4 a6 2.a5 b5(my program believe that there were 2 ways to capture b5 by en >passant move). > >1.c3 b5 2.Qa4(my program believed that b5 is pinned because of some error in >updating the pin array) > >1.d3 b5 2.Kd2 b4(considering Kc3 as legal because the array of the pseudo legal >moves does not have that move) > >Uri I obviously didn't use it. :) I added that because Peter Mckenzie posted some screwey position a few years ago and asked for those numbers. His position had most everything possible very quickly, castling, enpassant, promotions, you-name-it. You are debugging this about the only way you can. However, you are making one mistake that might well cost you a lot of time. What happens if _I_ have a bug and produce the wrong number? :)
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