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The pawns are poised to promote, but how does White deal with the obvious
Jacob Hoover: First White plays 1.d8S to threaten 2.Sf7 mate. Black's only defence is 1 ...Sd6. White then plays 2.Sf7+, sacrificing the knight; if he doesn't do this, Black has 2 ... Se8+ or 2 ... Se4+, followed by promoting the e-pawn. Black’s only defence is 2 ... Sxf7. White’s next move is 3.Se3 threatening 4.Sf5 mate, and Black’s only defence is the switchback 3 ...Sd6. White then plays 4.Sf5+, again to prevent black knight checks, and Black must play 4 ...Sxf5. We are now back to the initial position, except that there’s no white knight en prise. White can now safely play 5.b8Q, threatening 6.Qf4 mate and the only defence 5...Sd6 is met by 6.Qf8 mate.
Peter Niehoff: Without the white knight 1.b8Q mates in 2. The decoying of the black knight eliminates the white knight and prevents a promotion at f1.
Dafydd Johnston: Another witty problem by one of my favourite composers (who usually went by the name of Ado). The black knight is kept busy until we get back to the starting position minus white knight and d-pawn, after which promotion of the b-pawn forces mate next move.
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