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1.d1=R+ Kc8 2.Rd3 Nf1 3.Rxf3 Nd2 4.Rf1 Be4 5.Rd1 Nb3#Nice rundlauf by promoted bR.
Originally posted by BigDoggProblem[fen]3b4/1p1K2n1/8/5p2/5p2/5P2/1p1p3N/2k4B w - - 0 1[/fen]Helpmate in 5Black begins, and both sides move cooperatively. White's 5th moves gives mate.