Chess::Position

BLACK_KING_SIDE_CASTLE_FLAG = 1_u8 << 2

BLACK_QUEEN_SIDE_CASTLE_FLAG = 1_u8 << 3

EP_SQUARE_DIRECTION = [8, -8]

INITIAL = new(INITIAL_POSITION_IN_FEN)

INITIAL_POSITION_IN_FEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"

KING_CASTLE_FLAGS = [BLACK_QUEEN_SIDE_CASTLE_FLAG | BLACK_KING_SIDE_CASTLE_FLAG, WHITE_QUEEN_SIDE_CASTLE_FLAG | WHITE_KING_SIDE_CASTLE_FLAG]

PIECE_CHARS = "pnbrqk."

ROOK_CASTLE_FLAGS = Array(UInt8).new(64) do |idx| case idx when Square::A1.value WHITE_QUEEN_SIDE_CASTLE_FLAG when Square::H1.value WHITE_KING_SIDE_CASTLE_FLAG when Square::A8.value BLACK_QUEEN_SIDE_CASTLE_FLAG when Square::H8.value BLACK_KING_SIDE_CASTLE_FLAG else 0_u8 end end

WHITE_KING_SIDE_CASTLE_FLAG = 1_u8

WHITE_QUEEN_SIDE_CASTLE_FLAG = 1_u8 << 1

new(fen)

colours=(colours : Array(UInt64))

ep_square=(ep_square : Chess::Square)

fifty_move=(fifty_move : Int32)

flags=(flags : UInt8)

is_square_attacked?(square, colour)

key=(key : UInt64)

last_move=(last_move : Int32)

make_legal_move(move : MoveWrapper)

make_legal_move(move : Int32) : Position

make_move(move : MoveWrapper)

make_move(move : Int32) : Position | Nil

move_count=(move_count : Int32)

pawn_key=(pawn_key : UInt64)

pieces=(pieces : Array(UInt64))

side_to_move=(side_to_move : Chess::Colour)

type_on_square(idx)