24, -32, 107, -51, 117, -9, -126, -21, 31
};
+ // QueenMinorsImbalance[opp_minor_count] is applied when only one side has a queen.
+ // It contains a bonus/malus for the side with the queen.
+ const int QueenMinorsImbalance[16] = {
+ 31, -8, -15, -25, -5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+ };
+
// Endgame evaluation and scaling functions are accessed directly and not through
// the function maps because they correspond to more than one material hash key.
Endgame<KXK> EvaluateKXK[] = { Endgame<KXK>(WHITE), Endgame<KXK>(BLACK) };
bonus += pieceCount[Us][pt1] * v;
}
+ // Special handling of Queen vs. Minors
+ if (pieceCount[Us][QUEEN] == 1 && pieceCount[Them][QUEEN] == 0)
+ bonus += QueenMinorsImbalance[pieceCount[Them][KNIGHT] + pieceCount[Them][BISHOP]];
+
return bonus;
}