In the final move, the black King has 4 options, Kb3, Kb2, Kxa3, and Ka1. The only ones accepted are Kb3 and Kb2. Kxa3 is a blunder, but Ka1 is not accepted as a valid answer. Played Ka1 against lvl 8 Stockfish and won easily. Looked at the analysis board and Ka1 is clearly winning for black. This puzzle should accept this move as well.
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