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Simplify bonus for bishop on long diagonal

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Removing 2 conditions, and increase the ThreatbyPawn to compensate.

Passed STC
http://tests.stockfishchess.org/tests/view/59dbde900ebc5916ff64be6d
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 14236 W: 2615 L: 2483 D: 9138

Passed LTC
http://tests.stockfishchess.org/tests/view/59dc26470ebc5916ff64be92
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 16552 W: 2136 L: 2010 D: 12406

Bench: 5234652
This commit is contained in:
Alain SAVARD 2017-10-07 16:35:19 -04:00 • committed by Marco Costalba
parent b36489742b
commit 43c186c645
1 changed files with 7 additions and 10 deletions
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9
src/evaluate.cpp
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@ -31,7 +31,6 @@
namespace {
const Bitboard LongDiagonals = 0x8142241818244281ULL; // A1..H8 | H1..A8
const Bitboard Center = (FileDBB | FileEBB) & (Rank4BB | Rank5BB);
const Bitboard QueenSide = FileABB | FileBBB | FileCBB | FileDBB;
const Bitboard CenterFiles = FileCBB | FileDBB | FileEBB | FileFBB;
@ -222,7 +221,7 @@ namespace {
const Score CloseEnemies = S( 7, 0);
const Score PawnlessFlank = S( 20, 80);
const Score ThreatByHangingPawn = S( 71, 61);
const Score ThreatBySafePawn = S(182,175);
const Score ThreatBySafePawn = S(192,175);
const Score ThreatByRank = S( 16, 3);
const Score Hanging = S( 48, 27);
const Score WeakUnopposedPawn = S( 5, 25);
@ -354,10 +353,8 @@ namespace {
// Penalty for pawns on the same color square as the bishop
score -= BishopPawns * pe->pawns_on_same_color_squares(Us, s);
// Bonus for bishop on a long diagonal without pawns in the center
if ( (LongDiagonals & s)
&& !(attackedBy[Them][PAWN] & s)
&& !(Center & PseudoAttacks[BISHOP][s] & pos.pieces(PAWN)))
// Bonus for bishop on a long diagonal which can "see" both center squares
if (more_than_one(Center & (attacks_bb<BISHOP>(s, pos.pieces(PAWN)) | s)))
score += LongRangedBishop;
}