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Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski 2010-02-25 19:30:57 +02:00 • committed by Marco Costalba
parent 0d292d1a2d
commit 29fb389760
1 changed files with 7 additions and 1 deletions
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8
src/search.cpp
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@ -162,7 +162,10 @@ namespace {
// Step 6. Razoring // Step 6. Razoring
// Maximum depth for razoring
const Depth RazorDepth = 4 * OnePly; const Depth RazorDepth = 4 * OnePly;
// Dynamic razoring margin based on depth
inline Value razor_margin(Depth d) { return Value(0x200 + 0x10 * d); } inline Value razor_margin(Depth d) { return Value(0x200 + 0x10 * d); }
// Step 8. Null move search with verification search // Step 8. Null move search with verification search
@ -171,11 +174,12 @@ namespace {
// evaluation of the position is more than NullMoveMargin below beta. // evaluation of the position is more than NullMoveMargin below beta.
const Value NullMoveMargin = Value(0x200); const Value NullMoveMargin = Value(0x200);
// Depth limit for use of dynamic threat detection when null move fails low // Maximum depth for use of dynamic threat detection when null move fails low
const Depth ThreatDepth = 5 * OnePly; const Depth ThreatDepth = 5 * OnePly;
// Step 9. Internal iterative deepening // Step 9. Internal iterative deepening
// Minimum depth for use of internal iterative deepening
const Depth IIDDepthAtPVNodes = 5 * OnePly; const Depth IIDDepthAtPVNodes = 5 * OnePly;
const Depth IIDDepthAtNonPVNodes = 8 * OnePly; const Depth IIDDepthAtNonPVNodes = 8 * OnePly;
@ -191,6 +195,7 @@ namespace {
Depth CheckExtension[2], SingleEvasionExtension[2], PawnPushTo7thExtension[2]; Depth CheckExtension[2], SingleEvasionExtension[2], PawnPushTo7thExtension[2];
Depth PassedPawnExtension[2], PawnEndgameExtension[2], MateThreatExtension[2]; Depth PassedPawnExtension[2], PawnEndgameExtension[2], MateThreatExtension[2];
// Minimum depth for use of singular extension
const Depth SingularExtensionDepthAtPVNodes = 6 * OnePly; const Depth SingularExtensionDepthAtPVNodes = 6 * OnePly;
const Depth SingularExtensionDepthAtNonPVNodes = 8 * OnePly; const Depth SingularExtensionDepthAtNonPVNodes = 8 * OnePly;
@ -200,6 +205,7 @@ namespace {
// Step 12. Futility pruning // Step 12. Futility pruning
// Futility margin for quiescence search
const Value FutilityMarginQS = Value(0x80); const Value FutilityMarginQS = Value(0x80);
// Futility lookup tables (initialized at startup) and their getter functions // Futility lookup tables (initialized at startup) and their getter functions