Author: Russell Reagan
Date: 21:55:41 01/07/03
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On January 08, 2003 at 00:17:45, Joel wrote: >Thanks Russell. > >Now all I need is some trusted perft results! :) Here is a position that has a little bit of everything (castling, captures, promotions, plenty of pawn moves, you name it...). [D]r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 1 And here are the perft numbers: perft 1 = 48 perft 2 = 2,039 perft 3 = 97,862 perft 4 = 4,085,603 perft 5 = 193,690,690 perft 6 = 8,031,647,685 It *might* take a while to calculate perft 6 though ;) I just let mine run overnight while I was sleeping. Also, if you download Crafty or Yace it will allow you to calculate perft for any position. Just copy the FEN of the position, do a setboard command, like: setboard r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 1 and then type 'perft 4' (or whatever depth you want) and it will give you good results. Also Uri's program Movei comes with a program perft.exe that you can use in Winboard. It is the fastest perft calculator I think. From the opening position, here are the numbers up to perft 6 (from Crafty). White(1): perft 1 total moves=20 White(1): perft 2 total moves=400 White(1): perft 3 total moves=8902 White(1): perft 4 total moves=197281 White(1): perft 5 total moves=4865609 White(1): perft 6 total moves=119060324 Another thing. If you calculate perft using an int (32-bits), you can only count up to something like 4 billion I think. So (for example) to calculate perft 6 of the first position I posted, you will need to use a larger type, like unsigned __int64 in MSVC, or double.
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