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Move invariant of singular ext. check out of loop
It is almost always false. No functional change. Signed-off-by: Marco Costalba <mcostalba@gmail.com>
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1 changed files with 8 additions and 7 deletions
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@ -1229,6 +1229,11 @@ namespace {
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// Initialize a MovePicker object for the current position
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MovePicker mp = MovePicker(pos, ttMove, depth, H, ss, (PvNode ? -VALUE_INFINITE : beta));
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CheckInfo ci(pos);
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bool singularExtensionNode = depth >= SingularExtensionDepth[PvNode]
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&& tte && tte->move()
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&& !excludedMove // Do not allow recursive singular extension search
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&& is_lower_bound(tte->type())
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&& tte->depth() >= depth - 3 * OnePly;
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// Step 10. Loop through moves
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// Loop through all legal moves until no moves remain or a beta cutoff occurs
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@ -1251,13 +1256,9 @@ namespace {
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// Singular extension search. We extend the TT move if its value is much better than
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// its siblings. To verify this we do a reduced search on all the other moves but the
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// ttMove, if result is lower then ttValue minus a margin then we extend ttMove.
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if ( depth >= SingularExtensionDepth[PvNode]
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&& tte
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if ( singularExtensionNode
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&& move == tte->move()
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&& !excludedMove // Do not allow recursive singular extension search
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&& ext < OnePly
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&& is_lower_bound(tte->type())
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&& tte->depth() >= depth - 3 * OnePly)
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&& ext < OnePly)
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{
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Value ttValue = value_from_tt(tte->value(), ply);
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@ -1346,12 +1347,12 @@ namespace {
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value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth-ss->reduction, true, threadID);
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doFullDepthSearch = (value > alpha);
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}
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ss->reduction = Depth(0); // Restore original reduction
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}
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// Step 15. Full depth search
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if (doFullDepthSearch)
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{
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ss->reduction = Depth(0);
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value = newDepth < OnePly ? -qsearch<NonPV>(pos, ss+1, -(alpha+1), -alpha, Depth(0), threadID)
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: - search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth, true, threadID);
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