Daily Puzzle Candidate #13
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Such combinations won't be accepted as a Daily Puzzle since the solution does not stand out amidst the alternatives. For instance, on the 1st move starting with the Knight check ..Nb3+ is just 1 move slower. The Puzzle Engine will never require you to play a 5-move checkmate when a 6-move mate is also available. It is an unreasonable demand and even GMs may overlook it. Remember that Fischer missed a 4-move checkmate in his immortal game against Byrne and did it in 5!