internal protocol DiagonalMoves {
    func getDiagonalMoves(from pos: Square.Position) -> [Square.Position]
}

extension DiagonalMoves {
    func getDiagonalMoves(from pos: Square.Position) -> [Square.Position] {
        return []
    }
}

internal protocol LinearMoves {
    func getLinearMoves(from pos: Square.Position) -> [Square.Position]
}

extension LinearMoves {
    func getLinearMoves(from pos: Square.Position) -> [Square.Position] {
        return []
    }
}