In chess, which of the following can move only diagonally?

Bishop’s Movement:
The bishop moves diagonally across the board.

It can travel any number of squares in a diagonal direction, as long as the path is not blocked by another piece.

Each bishop is restricted to the color of the square it starts on (one always stays on light squares, the other always on dark squares).

Comparison with Other Pieces:

Pawn: Moves forward, but captures diagonally (not exclusively diagonal).

Rook: Moves only vertically or horizontally.

Knight: Moves in an "L" shape.

Queen: Moves diagonally, vertically, and horizontally (not restricted to diagonal).

King: Moves one square in any direction.

Answer: The Bishop is the only chess piece that moves exclusively diagonally.