#define S(mg, eg) make_score(mg, eg)
// Pawn penalties
- constexpr Score Backward = S( 9, 24);
- constexpr Score BlockedStorm = S(82, 82);
- constexpr Score Doubled = S(11, 56);
- constexpr Score Isolated = S( 5, 15);
- constexpr Score WeakLever = S( 0, 56);
- constexpr Score WeakUnopposed = S(13, 27);
+ constexpr Score Backward = S( 9, 24);
+ constexpr Score BlockedStorm = S(82, 82);
+ constexpr Score Doubled = S(11, 56);
+ constexpr Score DoubledIsolated = S(15, 57);
+ constexpr Score Isolated = S( 5, 15);
+ constexpr Score WeakLever = S( 0, 56);
+ constexpr Score WeakUnopposed = S(13, 27);
// Connected pawn bonus
constexpr int Connected[RANK_NB] = { 0, 7, 8, 12, 29, 48, 86 };
}
else if (!neighbours)
+ {
score -= Isolated
+ WeakUnopposed * !opposed;
+ if ( (ourPawns & forward_file_bb(Them, s))
+ && popcount(opposed) == 1
+ && !(theirPawns & adjacent_files_bb(s)))
+ score -= DoubledIsolated;
+ }
+
else if (backward)
score -= Backward
+ WeakUnopposed * !opposed;