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Apply King Safety later in the endgame

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Idea is to apply king safety later in the endgame. Previously, we didn't
apply KS in a RR vs. Q ending for example, which causes poor play.
Now we calculate king attacks when the attacking side has a queen or more.

STC with 8moves_v3
LLR: 3.06 (-2.94,2.94) [0.00,4.00]
Total: 38481 W: 6228 L: 5952 D: 26301

LTC with 2moves_v1
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 51053 W: 8670 L: 8353 D: 34030

Bench: 7514010

Resolves #98
This commit is contained in:
lucasart
2014-11-06 13:00:07 -05:00
committed by Gary Linscott
parent bc83515c9e
commit 8e98bd616e
1 changed files with 1 additions and 1 deletions
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2
src/evaluate.cpp
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@@ -221,7 +221,7 @@ namespace {
ei.attackedBy[Us][ALL_PIECES] = ei.attackedBy[Us][PAWN] = ei.pi->pawn_attacks(Us); ei.attackedBy[Us][ALL_PIECES] = ei.attackedBy[Us][PAWN] = ei.pi->pawn_attacks(Us);
// Init king safety tables only if we are going to use them // Init king safety tables only if we are going to use them
if (pos.non_pawn_material(Us) > QueenValueMg + PawnValueMg) if (pos.non_pawn_material(Us) >= QueenValueMg)
{ {
ei.kingRing[Them] = b | shift_bb<Down>(b); ei.kingRing[Them] = b | shift_bb<Down>(b);
b &= ei.attackedBy[Us][PAWN]; b &= ei.attackedBy[Us][PAWN];