Author: Roman Hartmann
Date: 06:47:59 02/23/06
Go up one level in this thread
On February 23, 2006 at 09:44:10, James Swafford wrote: >On February 23, 2006 at 09:41:52, James Swafford wrote: > >>On February 23, 2006 at 09:10:47, Charles Roberson wrote: >> >>> >>> Since I see others (Stuart) working on perft, I'll release a position that >>> is helping me find a bug. >>> >>> 7k/8/8/8/1p6/8/PP6/6K w - - 0 0 >>> >>> Here are the results >>> Depth Hand Calculation Telepath >>> 1 6 6 >>> 2 31 31 >>> 3 319 1288 >>> >>> Either my hand calculations are wrong or Telepath has a bug in the >>> EP code. The numbers represent the sum of all the nodes in the tree for that >>> depth. Thus, the 6 root nodes are counted in the 2 ply and 3 ply counts. >>> >>> Given that some do not count the nodes that way subtraction should do the >>> trick with the depth counts being 6, 25 and 287 respectively. >>> >>> I'd like to see somebody post perft results on this position for as many >>> depths as possible assuming they think their engine produces correct >>>results. >> >>Here is what I get with Prophet: >> >>Initializing position...done. >>setboard 7k/8/8/8/1p6/8/PP6/6K w - - 0 0 >> >>- - - - - - - k >>- - - - - - - - >>- - - - - - - - white to move >>- - - - - - - - no ep >>- p - - - - - - no castling rights >>- - - - - - - - >>P P - - - - - - >>- - - - - - K R Where do you get that rook from? Seems the fen-string is broken and this produces a ghost rook on your board. Maybe he intended (like Thomas pointed already out) something like that 7k/8/8/8/1p6/8/PP6/7K w - - 0 0 Roman >Uhm, isn't this position busted? How can white be on >move if the black king is in check? > >-- >James > >> >>perft 2 >>running perft on movegen: bitmap movegen >> >>29 moves (0 ms) >>perft 3 >>running perft on movegen: bitmap movegen >> >>225 moves (0 ms) >>perft 4 >>running perft on movegen: bitmap movegen >> >>1385 moves (1 ms) >>perft 5 >>running perft on movegen: bitmap movegen >> >>11494 moves (6 ms) >>perft 6 >>running perft on movegen: bitmap movegen >> >>77643 moves (56 ms) >>perft 7 >>running perft on movegen: bitmap movegen >> >>655713 moves (330 ms) >>perft 8 >>running perft on movegen: bitmap movegen >> >>639669 moves (331 ms) >> >>-- >>James
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