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Isolated pawn simplification

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STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 117822 W: 21697 L: 21744 D: 74381

LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 92307 W: 12330 L: 12305 D: 67672

Bench: 8813983

Resolves #659
This commit is contained in:
Stéphane Nicolet 2016-04-28 18:57:54 +02:00 • committed by Joona Kiiski
parent e082112cfe
commit 2694ef23c3
1 changed files with 3 additions and 7 deletions
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10
src/pawns.cpp
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@ -31,12 +31,8 @@ namespace {
#define V Value #define V Value
#define S(mg, eg) make_score(mg, eg) #define S(mg, eg) make_score(mg, eg)
// Isolated pawn penalty by opposed flag and file // Isolated pawn penalty by opposed flag
const Score Isolated[2][FILE_NB] = { const Score Isolated[2] = { S(45, 40), S(30, 27) };
{ S(31, 36), S(45, 41), S(50, 41), S(50, 41),
S(50, 41), S(50, 41), S(45, 41), S(31, 36) },
{ S(21, 24), S(30, 28), S(33, 28), S(33, 28),
S(33, 28), S(33, 28), S(30, 28), S(21, 24) } };
// Backward pawn penalty by opposed flag // Backward pawn penalty by opposed flag
const Score Backward[2] = { S(56, 33), S(41, 19) }; const Score Backward[2] = { S(56, 33), S(41, 19) };
@ -161,7 +157,7 @@ namespace {
// Score this pawn // Score this pawn
if (!neighbours) if (!neighbours)
score -= Isolated[opposed][f]; score -= Isolated[opposed];
else if (backward) else if (backward)
score -= Backward[opposed]; score -= Backward[opposed];