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If the King is on a corner space of a regular Chess board, it will take four Alfils to checkmate a King. Three will cover the spaces surrounding the King, and the fourth will check the King. Since the King cannot reach it, it will not need protection. If the King helps in the checkmate of an enemy King, only two Alfils will be required for checkmate. For example, with no other pieces on the board, Black is checkmated with the Black King at a1, the White King at a3, and White Alfils at c3 and d3. The c3 Alfil checks the King, and the d3 Alfil prevents escape to b1.