A Retro Problem by Stanislav Vokal

  
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Philip Roe    (2011-09-22 15:13:14)
A Retro Problem by Stanislav Vokal

The answer is no. Black must have moved either his K or his KR. The demonstration makes use of the fact that Knights cannot gain or lose a single move.

White has played the following eleven moves or their equivalents. Ng1-f3-h4-g6xBf8-g6, Nb1-c3-b5, axb3, f3, h3, Rg1 plus other move that must have been Qc1. Black has played the following nine moves or their equivalents. Nb8-c6-d4-b3xBc1-b3xQc1-b3, Nh6, hxg6. He has three moves left.

If any piece has moved twice, there is no possibility for the one remaining move. Therefore he must have made these three moves with either K or KR.




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