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Problem 2191
life and death
Instruction Required, Fun, Strange

Normally, you can't take back a move. In this problem, you have to!
Since Black can kill White with A, Whites last move was a mistake.
1. Take back the last white move! (of course, you have to choose a move that gives you the chance to live instead, because...)
2. After that, play a better move that allows White to live.

I didn't know a suitable way to present a problem like this on this site. Does anybody know a better way to show a "retractor"?

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