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Add a penalty for low mobility pieces

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Passed both STC
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 81857 W: 14652 L: 14342 D: 52863

and LTC
LLR: 2.97 (-2.94,2.94) [0.00,6.00]
Total: 45400 W: 6999 L: 6697 D: 31704

bench: 7716978
This commit is contained in:
Gary Linscott 2014-04-10 08:34:14 +02:00 • committed by Marco Costalba
parent 5c75455c8e
commit 8863afeb84
1 changed files with 6 additions and 0 deletions
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6
src/evaluate.cpp
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@ -171,6 +171,7 @@ namespace {
const Score UndefendedMinor = make_score(25, 10);
const Score TrappedRook = make_score(90, 0);
const Score Unstoppable = make_score( 0, 20);
const Score LowMobPenalty = make_score(40, 20);
// Penalty for a bishop on a1/h1 (a8/h8 for black) which is trapped by
// a friendly pawn on b2/g2 (b7/g7 for black). This can obviously only
@ -186,6 +187,8 @@ namespace {
(FileCBB | FileDBB | FileEBB | FileFBB) & (Rank7BB | Rank6BB | Rank5BB)
};
const Bitboard EdgeBB = Rank1BB | Rank8BB | FileABB | FileHBB;
// King danger constants and variables. The king danger scores are taken
// from KingDanger[]. Various little "meta-bonuses" measuring the strength
// of the enemy attack are added up into an integer, which is used as an
@ -491,6 +494,9 @@ Value do_evaluate(const Position& pos) {
mobility[Us] += MobilityBonus[Pt][mob];
if (mob <= 1 && (EdgeBB & s))
score -= LowMobPenalty;
// Decrease score if we are attacked by an enemy pawn. The remaining part
// of threat evaluation must be done later when we have full attack info.
if (ei.attackedBy[Them][PAWN] & s)