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qsearch: do not call evaluate when in check

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Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2008-12-16 12:55:44 +01:00
parent a55b06d3c9
commit bfbfc24d07
1 changed files with 5 additions and 5 deletions
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src/search.cpp
+5 -5
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@@ -1439,14 +1439,15 @@ namespace {
return value_from_tt(tte->value(), ply); return value_from_tt(tte->value(), ply);
// Evaluate the position statically // Evaluate the position statically
Value staticValue = evaluate(pos, ei, threadID); bool isCheck = pos.is_check();
Value staticValue = (isCheck ? -VALUE_INFINITE : evaluate(pos, ei, threadID));
if (ply == PLY_MAX - 1) if (ply == PLY_MAX - 1)
return staticValue; return evaluate(pos, ei, threadID);
// Initialize "stand pat score", and return it immediately if it is // Initialize "stand pat score", and return it immediately if it is
// at least beta. // at least beta.
Value bestValue = (pos.is_check() ? -VALUE_INFINITE : staticValue); Value bestValue = staticValue;
if (bestValue >= beta) if (bestValue >= beta)
return bestValue; return bestValue;
@@ -1458,11 +1459,10 @@ namespace {
// to search the moves. Because the depth is <= 0 here, only captures, // to search the moves. Because the depth is <= 0 here, only captures,
// queen promotions and checks (only if depth == 0) will be generated. // queen promotions and checks (only if depth == 0) will be generated.
bool pvNode = (beta - alpha != 1); bool pvNode = (beta - alpha != 1);
MovePicker mp = MovePicker(pos, pvNode, MOVE_NONE, EmptySearchStack, depth, &ei); MovePicker mp = MovePicker(pos, pvNode, MOVE_NONE, EmptySearchStack, depth, isCheck ? NULL : &ei);
Move move; Move move;
int moveCount = 0; int moveCount = 0;
Bitboard dcCandidates = mp.discovered_check_candidates(); Bitboard dcCandidates = mp.discovered_check_candidates();
bool isCheck = pos.is_check();
bool enoughMaterial = pos.non_pawn_material(pos.side_to_move()) > RookValueMidgame; bool enoughMaterial = pos.non_pawn_material(pos.side_to_move()) > RookValueMidgame;
// Loop through the moves until no moves remain or a beta cutoff // Loop through the moves until no moves remain or a beta cutoff