Catastrophe! During a last-minute mad scramble, a White pawn was struck off the board into oblivion. Neither player can remember where to place it. The piece count is looking bad for Black. Additionally, White is threatening a mate in one.
Two things may save Black yet.
- White has only one second left on the clock.
- The mate in one may not be legal.
In how many ways can Black legally place the missing White pawn to create a saving grace?
Wolfgang Dittmann, Die Schwalbe 11/10/1968