From 2e11388581aca5232b54437a4338012bcf7a5ff7 Mon Sep 17 00:00:00 2001 From: Torsten Franz Date: Tue, 30 Jan 2018 09:40:56 +0100 Subject: [PATCH] Retire lever (#1378) Retire the lever bonus from pawns evaluation STC: http://tests.stockfishchess.org/tests/view/5a6aef5c0ebc590d945d59c8 LLR: 2.94 (-2.94,2.94) [-3.00,1.00] Total: 88290 W: 19549 L: 19560 D: 49181 LTC: http://tests.stockfishchess.org/tests/view/5a6b70140ebc590d945d59f7 LLR: 3.22 (-2.94,2.94) [-3.00,1.00] Total: 104603 W: 18105 L: 18108 D: 68390 Bench 5023629 --- src/pawns.cpp | 9 --------- 1 file changed, 9 deletions(-) diff --git a/src/pawns.cpp b/src/pawns.cpp index 915cd0ce..ceacca82 100644 --- a/src/pawns.cpp +++ b/src/pawns.cpp @@ -43,12 +43,6 @@ namespace { // Doubled pawn penalty const Score Doubled = S(18, 38); - // Lever bonus by rank - const Score Lever[RANK_NB] = { - S( 0, 0), S( 0, 0), S(0, 0), S(0, 0), - S(17, 16), S(33, 32), S(0, 0), S(0, 0) - }; - // Weakness of our pawn shelter in front of the king by [isKingFile][distance from edge][rank]. // RANK_1 = 0 is used for files where we have no pawns or our pawn is behind our king. const Value ShelterWeakness[][int(FILE_NB) / 2][RANK_NB] = { @@ -184,9 +178,6 @@ namespace { if (doubled && !supported) score -= Doubled; - - if (lever) - score += Lever[relative_rank(Us, s)]; } return score; -- 2.39.2