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Chess twin problem -- hints

Posted By: Timothy Chow
Date: Tuesday, 24 October 2023, at 12:26 p.m.

In Response To: Chess twin problem -- hints (Nack Ballard)

The fourth try is cd defeated by e5. This problem illustrates what is called a Pickanniny theme. The four tries are the four possible moves by a White pawn, and the four refutations are the four possible moves by a Black pawn.

The reason for "plausible" move rather than "move" is that something like 1.Qc6+ is uniquely refuted by 1...Nxc6, but this is not considered to be interesting. Instead of "plausible," one could instead say that each check mark represents a "thematic" or "interesting" try.

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