Is there a force mate?

Logic Level 2

White to move. What is the minimum number of moves for white to checkmate the black king. Assume both sides play optimally. If a force mate is not possible, give your answer as 0 0 .

Composed by L-C. M. de La Bourdonnais, 1883

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1 solution

Francis Kong
Nov 23, 2017
  1. Ng6+

If ...Kg8, 2. Ne7+ Kh8 3. Rxh7+ Kxh7 4. Rh1#

If ...fxg6, 2. Rxh7+ Kxh7 3. Rh1#

As such, it takes maximum 4 \boxed{4} moves to checkmate the black King.

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