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Puzzle 44971 incorrect

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.
The fact that it is winning as well doesn't imply it should be a good solution. In a puzzle on lichess, you must look for the best solution(s) only.

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