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Do not razor while in check or value is mate

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Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2008-12-15 16:47:30 +01:00
parent dae2f600d6
commit ecc19381b4
1 changed files with 7 additions and 4 deletions
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11
src/search.cpp
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@ -1195,6 +1195,7 @@ namespace {
if ( UseNullDrivenIID if ( UseNullDrivenIID
&& nullValue < beta && nullValue < beta
&& depth > 6 * OnePly && depth > 6 * OnePly
&&!value_is_mate(nullValue)
&& ttMove == MOVE_NONE && ttMove == MOVE_NONE
&& ss[ply + 1].currentMove != MOVE_NONE && ss[ply + 1].currentMove != MOVE_NONE
&& pos.move_is_capture(ss[ply + 1].currentMove) && pos.move_is_capture(ss[ply + 1].currentMove)
@ -1236,8 +1237,10 @@ namespace {
} }
} }
// Null move search not allowed, try razoring // Null move search not allowed, try razoring
else if ( (approximateEval < beta - RazorMargin && depth < RazorDepth) else if ( !isCheck
||(approximateEval < beta - PawnValueMidgame && depth <= OnePly)) && !value_is_mate(beta)
&& ( (approximateEval < beta - RazorMargin && depth < RazorDepth)
||(approximateEval < beta - PawnValueMidgame && depth <= OnePly)))
{ {
Value v = qsearch(pos, ss, beta-1, beta, Depth(0), ply, threadID); Value v = qsearch(pos, ss, beta-1, beta, Depth(0), ply, threadID);
if (v < beta) if (v < beta)
@ -1454,12 +1457,12 @@ namespace {
// Initialize a MovePicker object for the current position, and prepare // Initialize a MovePicker object for the current position, and prepare
// 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.
MovePicker mp = MovePicker(pos, false, MOVE_NONE, EmptySearchStack, depth, &ei); bool pvNode = (beta - alpha != 1);
MovePicker mp = MovePicker(pos, pvNode, MOVE_NONE, EmptySearchStack, depth, &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 isCheck = pos.is_check();
bool pvNode = (beta - alpha != 1);
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