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Well spotted, but what do you play after:

  1. ... a3
  2. Bc7 ?

I would play Bd4 then; thus the diagonal d4-a1 will be blocked with a pawn or a piece and enables the pawn on a3 to promote.;
2....Bd4 3. Nxd4 a2 -+

That's correct! Congrats to be the winner of this round, @iceblue! :)

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