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Fix tablebase probe for dtz >1000 w/o 50 move rule

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For qn4N1/6R1/3K4/8/B2k4/8/8/8 w - - 0 1, white loses with DTZ 1034.
See https://syzygy-tables.info/?fen=qn4N1/6R1/3K4/8/B2k4/8/8/8_w_-_-_0_1

Prior to this fix, due to a too small hard-coded value, Stockfish interpreted this as winning.
The new value picked (1<<18) is large enough to deal with the largest DTZ values that can be stored in the current syzygy format.

closes https://github.com/official-stockfish/Stockfish/pull/4187

No functional change.
This commit is contained in:
Rodrigo Roim
2022-10-07 16:55:07 -07:00
committed by Joost VandeVondele
parent 9be2977da7
commit 79c5f3a692
3 changed files with 8 additions and 8 deletions
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@@ -169,6 +169,7 @@ renouve
Reuven Peleg
Richard Lloyd
Rodrigo Exterckötter Tjäder
Rodrigo Roim (roim)
Ron Britvich (Britvich)
Ronald de Man (syzygy1, syzygy)
rqs