bitboards.h

# pragma once

#ifndef BITBOARDS_H
#define BITBOARDS_H

#include "types.h"
#include "utils.h"

namespace bitboards {

	extern U64 row[8];
	extern U64 col[8];
	extern U64 pawnmask[2]; // 2nd - 6th rank mask for pawns (to exclude promotion candidates)
	extern U64 pawnmaskleft[2]; // 2nd - 6th rank mask for pawn captures
	extern U64 pawnmaskright[2]; // 2nd - 6th rank mask for pawn captures
	extern U64 pattks[2][64]; // step attacks for the pawns
	extern U64 nmask[64]; // step attacks for the knight
	extern U64 kmask[64]; // step attacks for the king
	extern U64 kchecks[5][64];
	extern U64 kflanks[8]; // 3 rows of squares (including king square) for pawn cover detection
	extern U64 kzone[64];
	extern U64 bmask[64]; // bishop mask (outer board edges are trimmed)
	extern U64 rmask[64]; // rook mask (outer board edges are trimmed)
	extern U64 squares[64];
	extern U64 battks[64];
	extern U64 rattks[64];
	extern U64 kpawnstorm[2][2]; // to detect enemy pawn storms against our king
	extern U64 between[64][64]; // bits set between 2 squares that are aligned
	extern U64 edges;
	extern U64 corners;
	extern U64 small_center_mask;
	extern U64 big_center_mask;
	extern U64 pawn_majority_masks[3];
	extern U64 passpawn_mask[2][64];
	extern U64 neighbor_cols[8];
	extern U64 colored_sqs[2];
	extern U64 front_region[2][64];
	extern unsigned reductions[2][2][64][64]; // max-depth = 64

	void load();

}

#endif