Fathom returns wrong result in some positions.

basil00 / Fathom

Syzygy TB probe tool.

MIT License

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Fathom returns wrong result in some positions. #10

Closed basil00 closed 8 years ago

basil00 commented 8 years ago

E.g.

5k2/8/5K2/8/6p1/8/7P/4B3 w - - 0 1

Fathom plays h4 (a drawing move). This issue was discovered by Marco Costalba and reported here: http://talkchess.com/forum/viewtopic.php?p=673269#673269 (This is probably a bug in the original syzygy probing code, not specific to Fathom's version).

If I understand the issue correctly, it seems this can only turn a win into a draw (never a win or draw into a loss).

niklasf commented 8 years ago

Just saw the commit in Stockfish official-stockfish/Stockfish@6e2ca97d93812b2 and came here to report it. Only to see it already fixed. Very nice, much appreciated! :+1: