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Enable Futility pruning in PV nodes

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STC:

LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 21553 W: 4342 L: 4221 D: 12990

LTC:

LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 7675 W: 1351 L: 1209 D: 5115

Bench: 8668014

Resolves #205
This commit is contained in:
Stefan Geschwentner 2015-01-14 20:11:33 +00:00 • committed by Joona Kiiski
parent 7b20bb6e1a
commit 4abe333e1f
1 changed files with 3 additions and 4 deletions
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7
src/search.cpp
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@ -632,7 +632,7 @@ namespace {
} }
// Step 7. Futility pruning: child node (skipped when in check) // Step 7. Futility pruning: child node (skipped when in check)
if ( !PvNode if ( !RootNode
&& depth < 7 * ONE_PLY && depth < 7 * ONE_PLY
&& eval - futility_margin(depth) >= beta && eval - futility_margin(depth) >= beta
&& eval < VALUE_KNOWN_WIN // Do not return unproven wins && eval < VALUE_KNOWN_WIN // Do not return unproven wins
@ -829,9 +829,8 @@ moves_loop: // When in check and at SpNode search starts from here
// Update the current move (this must be done after singular extension search) // Update the current move (this must be done after singular extension search)
newDepth = depth - ONE_PLY + extension; newDepth = depth - ONE_PLY + extension;
// Step 13. Pruning at shallow depth (exclude PV nodes) // Step 13. Pruning at shallow depth
if ( !PvNode if ( !captureOrPromotion
&& !captureOrPromotion
&& !inCheck && !inCheck
&& !dangerous && !dangerous
&& bestValue > VALUE_MATED_IN_MAX_PLY) && bestValue > VALUE_MATED_IN_MAX_PLY)