Tkinter GUI Application Development Blueprints, Second Edition - Second Edition

Rules for the Knight

The knight is a different beast because it does not move orthogonally or diagonally. It can also jump over chess pieces.

Like the rules that we followed earlier to arrive at ORTHOGONAL_POSITIONS and DIAGONAL_POSITIONS, we can similarly arrive at the rules that are required to determine the KNIGHT_POSITIONS tuple. This is defined in 4.04—configurations.py, as follows:

KNIGHT_POSITIONS = ((-2,-1),(-2,1),(-1,-2),(-1,2),(1,-2),(1,2),(2,-1),(2,1))

Next, let's override the moves_available method from the Knight class (see code 4.04—piece.py):

class Knight(Piece): def moves_available(self, current_position):   model = self.model   allowed_moves = []   start_position = get_numeric_notation(current_position.upper()) piece = model.get(pos.upper()) ...