+ static_cast<IndexType>(SQUARE_NB) * static_cast<IndexType>(PS_NB) / 2;
+
+ static constexpr int KingBuckets[64] = {
+ -1, -1, -1, -1, 31, 30, 29, 28,
+ -1, -1, -1, -1, 27, 26, 25, 24,
+ -1, -1, -1, -1, 23, 22, 21, 20,
+ -1, -1, -1, -1, 19, 18, 17, 16,
+ -1, -1, -1, -1, 15, 14, 13, 12,
+ -1, -1, -1, -1, 11, 10, 9, 8,
+ -1, -1, -1, -1, 7, 6, 5, 4,
+ -1, -1, -1, -1, 3, 2, 1, 0
+ };