Author: James Swafford
Date: 06:41:52 02/23/06
Go up one level in this thread
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 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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