White to Mate in two moves:
White can only mate on two squares e7 and h8, but if 1.Qa3 black has 1...c5 or 2...O-O-O. If 1.Qa1 then 1...O-O-O. At least that's what I thought, but after 1.Qa1 black can't castle because he made the last move and it must have been with either the King or Rook, so castling is not legal.
Friday, October 26, 2018
Thursday, September 20, 2018
Saturday, April 28, 2018
Solution to Retrograde Problem
Saturday, March 31, 2018
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