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Fix evasion pruning condition

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Avoid incorrect mate scores in positions like

BK5/1R4b1/2k1Np2/3p3b/2p3pq/p1rB4/n2n1p2/8 w - -

Thanks for Jouni Uski for reporting the problem

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski 2010-04-13 18:25:50 +03:00 • committed by Marco Costalba
parent a4a0ffce71
commit 9a3fc4d3fb
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1713,7 +1713,7 @@ namespace {
// Detect blocking evasions that are candidate to be pruned // Detect blocking evasions that are candidate to be pruned
evasionPrunable = isCheck evasionPrunable = isCheck
&& bestValue != -VALUE_INFINITE && bestValue > value_mated_in(PLY_MAX)
&& !pos.move_is_capture(move) && !pos.move_is_capture(move)
&& pos.type_of_piece_on(move_from(move)) != KING && pos.type_of_piece_on(move_from(move)) != KING
&& !pos.can_castle(pos.side_to_move()); && !pos.can_castle(pos.side_to_move());