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Don't update bestValue when pruning

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Simply return a fail-low score

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-12-08 19:12:17 +01:00
parent 14df99130f
commit 3f14ed6602
2 changed files with 13 additions and 8 deletions
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2
src/thread.cpp
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@@ -263,7 +263,7 @@ Value ThreadsManager::split(Position& pos, Stack* ss, Value alpha, Value beta,
Value bestValue, Depth depth, Move threatMove,
int moveCount, MovePicker* mp, int nodeType) {
assert(pos.pos_is_ok());
assert(bestValue >= -VALUE_INFINITE);
assert(bestValue > -VALUE_INFINITE);
assert(bestValue <= alpha);
assert(alpha < beta);
assert(beta <= VALUE_INFINITE);