constexpr std::size_t kMaxSimdWidth = 32;
+ // unique number for each piece type on each square
+ enum {
+ PS_NONE = 0,
+ PS_W_PAWN = 1,
+ PS_B_PAWN = 1 * SQUARE_NB + 1,
+ PS_W_KNIGHT = 2 * SQUARE_NB + 1,
+ PS_B_KNIGHT = 3 * SQUARE_NB + 1,
+ PS_W_BISHOP = 4 * SQUARE_NB + 1,
+ PS_B_BISHOP = 5 * SQUARE_NB + 1,
+ PS_W_ROOK = 6 * SQUARE_NB + 1,
+ PS_B_ROOK = 7 * SQUARE_NB + 1,
+ PS_W_QUEEN = 8 * SQUARE_NB + 1,
+ PS_B_QUEEN = 9 * SQUARE_NB + 1,
+ PS_W_KING = 10 * SQUARE_NB + 1,
+ PS_END = PS_W_KING, // pieces without kings (pawns included)
+ PS_B_KING = 11 * SQUARE_NB + 1,
+ PS_END2 = 12 * SQUARE_NB + 1
+ };
+
+ extern const uint32_t kpp_board_index[PIECE_NB][COLOR_NB];
+
// Type of input feature after conversion
using TransformedFeatureType = std::uint8_t;
using IndexType = std::uint32_t;