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Joseph DiMuro wrote on Mon, Oct 21, 2013 12:35 AM UTC:
Note: in this problem, it can be determined that the Black king no longer has his "move-like-a-knight" privilege. Which seems to be essential to the solution; otherwise, White would be moving into check on his second move.

What piece did Black move last? Obviously not a pawn (the pawns haven't moved yet), so he must have moved his king. Moreover, he must have moved his king from e8; all other nearby squares are either occupied or are adjacent to the White King. So Black just moved his king out of check from the pawn on d7; thus, the Black king can no longer move like a knight.

Also, I think this problem is cooked; 1.Gxb7 seems to work just as well. Please correct me if I'm wrong.

-Joseph DiMuro

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Comment on the page Chaturanga Problem by Bas de Haas

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