- // Penalty for big distance between king and knight for the defending king
- // and knight in KR vs KN endgames.
- const int KRKNKingKnightDistancePenalty[8] = { 0, 0, 4, 10, 20, 32, 48, 70 };
-
- // Build corresponding key code for the opposite color: "KBPKN" -> "KNKBP"
- const string swap_colors(const string& keyCode) {
+ // Get the material key of a Position out of the given endgame key code
+ // like "KBPKN". The trick here is to first forge an ad-hoc fen string
+ // and then let a Position object to do the work for us. Note that the
+ // fen string could correspond to an illegal position.
+ Key key(const string& code, Color c) {