Author: James Swafford
Date: 06:44:10 02/23/06
Go up one level in this thread
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 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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