My First puzzle
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Good job, especially for a first puzzle. Confirmed sound by Stockfish, which took about 5 secs to solve and that actually indicates how hard this is, considering how Stockfish solves a lot of studies instantaneously. Now for the bad news - the position is illegal because the BK could never have reached a8 (the BR is in the way and it is in turn trapped by the BB, which had never moved given the BPs on b7/d7). This is just unlucky and I hope it can be fixed.