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RE: Chess Puzzle of the Day (May 22, 2020) | Problema de ajedrez del día (22-May-2020)

  1. ... Rxa2+
  2. Kb4 Nb1
    (3. Qd4 a5#) or (3. c4 a5#)
    (3. Qxe6+ just prolongs the mate 3. ... Bxe6 4. Ba6 c5+ 5. Kb5 Bd7# )
  3. Ba6 c5+
  4. Kb5 Bd7#
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Excellent! You found the non-evident move Nb1.

Yes it was a very unusual move. The ♘ was almost out of the box.