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non-optimal training task solutions

Take a look, for example, at lichess.org/training/4170
Obviously, best move is Bb4+, then Qf7x
But the system considers this line as wrong, and expects Qf7+ with mate in 4 or something moves.

There is many other bad tasks.
Except that with Bb4+ there is Qd6 and there is no mate. Sure, it likely wins the queen, but forced mate is better.

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