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1.Nf3!?
1.Nf3!?
then
1…g1Q
2.Nxg1 h2
1.Nf3 g1=Q
2.NxQg1 h2
3.Nh3 h1=Q
4.Nf2+
It is difficult to see in this variation, that 3.Nh3 wins but not 3.Nf3, but endgame databases acknowledge it (sorry, but this study is beyond my horizon).
Nevertheless, I think that simply 1…Kxf3 puts up the toughest practical defense (if black plays perfect), if you take a look at the long maneuvring/check series of the wQ which is required after that. After a long sequence of the correct moves, White will have to capture the h3 pawn in the moment when the bK is on f1 and therefore the g2 pawn will be pinned. Then, you’d still have to know how to win Q vs. knight pawn on the next to last rank…
1. Nf3 Kxf3
2. a8=Q+ and I don’t see the win.
Anon 9;17,
Yhe, I get it. Ok.
Tx.
From the oracle:
1.Nf3 (only) Kxf3 (longest)
2.a8=Q (obviously) Kf1 (ditto)
3.Qa7 (only) Kf1 (ditto)
4.Qa1 (only) Kf2
5.Qd4 (‘only’) Kf3
and it goes on quite a bit.