Key move: Pe1! - promote to Knight, threatening Nc7 Mate

Pe1(S)!, Bxe8, Bc4 Mate
Pe1(S)!, Nxe8, Qa1 Mate
Pe1(S)!, 7Ne6, Qa1 Mate
Pe1(S)!, RxC8, PxC8(Q) Mate
Pe1(S)!, 5Ne6, Ra5 Mate

Other possible moves fail to defeat the threat.

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