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Fix syzygy with partial TB

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In case we have installed a not complete set of 6-men tables and
there is 6 piece position on board, but no corresponding
tablebase engine is not using any syzygy at all.

Reported by Jouni Uski, fix by Peter Österlund,
confirmed as a bug by Ronald de Man.

bench: 7591630
This commit is contained in:
Marco Costalba 2016-09-03 08:19:17 +02:00
parent d37dfe9ae4
commit c5828c4eba
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1641,7 +1641,7 @@ void Tablebases::filter_root_moves(Position& pos, Search::RootMoves& rootMoves)
RootInTB = root_probe_wdl(pos, rootMoves, TB::Score);
// Only probe during search if winning
if (TB::Score <= VALUE_DRAW)
if (RootInTB && TB::Score <= VALUE_DRAW)
Cardinality = 0;
}