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Pawn endgames directly skip early pruning.

Browse source 
Instead of checking individual steps. Idea by @Stefano80.

passed STC
http://tests.stockfishchess.org/tests/view/5a23e5d20ebc590ccbb8b6d5
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 37445 W: 6866 L: 6773 D: 23806

passed LTC
http://tests.stockfishchess.org/tests/view/5a24260c0ebc590ccbb8b716
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 38780 W: 4946 L: 4848 D: 28986

Bench: 5466219
This commit is contained in:
Joost VandeVondele 2017-12-03 12:49:02 +01:00 • committed by Marco Costalba
parent 54f6ce70fd
commit d193482213
1 changed files with 3 additions and 5 deletions
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8
src/search.cpp
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@ -656,7 +656,7 @@ namespace {
ss->staticEval, TT.generation());
}
if (skipEarlyPruning)
if (skipEarlyPruning || !pos.non_pawn_material(pos.side_to_move()))
goto moves_loop;
// Step 6. Razoring (skipped when in check)
@ -677,15 +677,13 @@ namespace {
if ( !rootNode
&& depth < 7 * ONE_PLY
&& eval - futility_margin(depth) >= beta
&& eval < VALUE_KNOWN_WIN // Do not return unproven wins
&& pos.non_pawn_material(pos.side_to_move()))
&& eval < VALUE_KNOWN_WIN) // Do not return unproven wins
return eval;
// Step 8. Null move search with verification search (is omitted in PV nodes)
if ( !PvNode
&& eval >= beta
&& ss->staticEval >= beta - 36 * depth / ONE_PLY + 225
&& pos.non_pawn_material(pos.side_to_move()))
&& ss->staticEval >= beta - 36 * depth / ONE_PLY + 225)
{
assert(eval - beta >= 0);