From 0ba814b3ca97a98c38cf561cee676b61cd600763 Mon Sep 17 00:00:00 2001 From: Stefan Geschwentner Date: Tue, 1 Apr 2014 11:58:10 +0200 Subject: [PATCH] Drop not defended by pawn condition Passed no-regression test both at STC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 96554 W: 17563 L: 17572 D: 61419 and at LTC LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 31891 W: 4905 L: 4801 D: 22185 bench: 7720896 --- src/evaluate.cpp | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/src/evaluate.cpp b/src/evaluate.cpp index fd78d5af..ac597ff8 100644 --- a/src/evaluate.cpp +++ b/src/evaluate.cpp @@ -204,8 +204,6 @@ namespace { const int BishopCheck = 2; const int KnightCheck = 3; - const int UnsupportedPinnedPiece = 2; - // KingDanger[Color][attackUnits] contains the actual king danger weighted // scores, indexed by color and by a calculated integer number. Score KingDanger[COLOR_NB][128]; @@ -631,6 +629,7 @@ Value do_evaluate(const Position& pos) { // the pawn shelter (current 'score' value). attackUnits = std::min(20, (ei.kingAttackersCount[Them] * ei.kingAttackersWeight[Them]) / 2) + 3 * (ei.kingAdjacentZoneAttacksCount[Them] + popcount(undefended)) + + 2 * (ei.pinnedPieces[Us] != 0) - mg_value(score) / 32; // Analyse the enemy's safe queen contact checks. Firstly, find the @@ -695,10 +694,6 @@ Value do_evaluate(const Position& pos) { if (b) attackUnits += KnightCheck * popcount(b); - // Penalty for pinned pieces not defended by a pawn - if (ei.pinnedPieces[Us] & ~ei.attackedBy[Us][PAWN]) - attackUnits += UnsupportedPinnedPiece; - // To index KingDanger[] attackUnits must be in [0, 99] range attackUnits = std::min(99, std::max(0, attackUnits)); -- 2.39.2