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Revert "Allowing singular extension in mate positions"

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It was causing an assert: value > -VALUE_INFINITE
under some conditions.

See https://github.com/official-stockfish/Stockfish/issues/2036

Bench: 3318033
This commit is contained in:
Marco Costalba 2019-03-09 13:24:26 +01:00
parent 1aab5b4b05
commit 4d0981fef3
1 changed files with 3 additions and 2 deletions
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5
src/search.cpp
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@ -914,12 +914,13 @@ moves_loop: // When in check, search starts from here
&& move == ttMove
&& !rootNode
&& !excludedMove // Avoid recursive singular search
&& ttValue != VALUE_NONE
/* && ttValue != VALUE_NONE Already implicit in the next condition */
&& abs(ttValue) < VALUE_KNOWN_WIN
&& (tte->bound() & BOUND_LOWER)
&& tte->depth() >= depth - 3 * ONE_PLY
&& pos.legal(move))
{
Value singularBeta = std::max(ttValue - 2 * depth / ONE_PLY, -VALUE_MATE);
Value singularBeta = ttValue - 2 * depth / ONE_PLY;
ss->excludedMove = move;
value = search<NonPV>(pos, ss, singularBeta - 1, singularBeta, depth / 2, cutNode);
ss->excludedMove = MOVE_NONE;