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Adjust singular extension search depth

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This patch applies a different singular extension search logic in case the position is ttPv && !PvNode.
It changes the depth of this search, higher for this types of nodes, and lower for other nodes.

passed STC
http://tests.stockfishchess.org/tests/view/5e72bbaae42a5c3b3ca2e75e
LLR: 2.94 (-2.94,2.94) {-0.50,1.50}
Total: 12692 W: 2608 L: 2389 D: 7695
Ptnml(0-2): 238, 1414, 2839, 1601, 254

passed LTC
http://tests.stockfishchess.org/tests/view/5e731c07e42a5c3b3ca2e770
LLR: 2.96 (-2.94,2.94) {0.25,1.75}
Total: 145716 W: 19218 L: 18626 D: 107872
Ptnml(0-2): 1100, 13605, 42899, 14111, 1143

closes https://github.com/official-stockfish/Stockfish/pull/2590

Bench: 5398277
This commit is contained in:
Vizvezdenec 2020-03-20 12:12:56 +03:00 • committed by Joost VandeVondele
parent ff27109313
commit 6ecab03dee
1 changed files with 2 additions and 2 deletions
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4
src/search.cpp
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@ -1055,9 +1055,9 @@ moves_loop: // When in check, search starts from here
&& pos.legal(move))
{
Value singularBeta = ttValue - (((ttPv && !PvNode) + 4) * depth) / 2;
Depth halfDepth = depth / 2;
Depth singularDepth = (depth - 1 + 3 * (ttPv && !PvNode)) / 2;
ss->excludedMove = move;
value = search<NonPV>(pos, ss, singularBeta - 1, singularBeta, halfDepth, cutNode);
value = search<NonPV>(pos, ss, singularBeta - 1, singularBeta, singularDepth, cutNode);
ss->excludedMove = MOVE_NONE;
if (value < singularBeta)