If a Tactics Trainer puzzle does not have a "Report Problem" link then it has already been confirmed as correct. If Rb4 on the last move then Black can play Rh5 and it will no longer be a checkmate. In the main line of the solution a checkmate can be forced by White.
Patzer24: If a Tactics Trainer puzzle does not have a "Report Problem" link then it has already been confirmed as correct.
How about this one (problem ID # 0041054)? Isn't requesting White's last move unnecessary?
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