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Remove penalty for knight when few enemy pawns

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Tested in standard mode at STC and no-regression
mode at LTC:

STC
LLR: 2.97 (-2.94,2.94) [-1.50,4.50]
Total: 19503 W: 3502 L: 3349 D: 12652

LTC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 67474 W: 9974 L: 9921 D: 47579

bench: 8331217
This commit is contained in:
Arjun Temurnikar 2014-04-18 18:54:23 -07:00 • committed by Marco Costalba
parent f70cef3b79
commit 6579a65bbb
1 changed files with 0 additions and 5 deletions
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5
src/evaluate.cpp
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@ -166,7 +166,6 @@ namespace {
const Score RookOpenFile = make_score(43, 21);
const Score RookSemiopenFile = make_score(19, 10);
const Score BishopPawns = make_score( 8, 12);
const Score KnightPawns = make_score( 8, 4);
const Score MinorBehindPawn = make_score(16, 0);
const Score UndefendedMinor = make_score(25, 10);
const Score TrappedRook = make_score(90, 0);
@ -349,10 +348,6 @@ namespace {
if (Pt == BISHOP)
score -= BishopPawns * ei.pi->pawns_on_same_color_squares(Us, s);
// Penalty for knight when there are few enemy pawns
if (Pt == KNIGHT)
score -= KnightPawns * std::max(5 - pos.count<PAWN>(Them), 0);
// Bishop and knight outposts squares
if (!(pos.pieces(Them, PAWN) & pawn_attack_span(Us, s)))
score += evaluate_outposts<Pt, Us>(pos, ei, s);