A two part puzzle today, given as separate postings.
White to play and draw, after black instead played …Kf7 in the diagram position, rather than the winning move given in the previous posting.
KF Kirby v P Kroon 1967-68
1 Nf3 is a move I would play more out of hope than from assurance: if it doesn’t work, then there is nothing else, and all I would do is hope there is perpetual.
After 1..Kf7? 2 Nf3 ef 3 Qd5+ Kf6, all that white has to do is find 4 Qd4+! locking black’s king in his box, not permitting it to scuttle away- 4 Qd6+? Kg5 and Kh6 etc; after 4 Qd4+, 4…Kg5 is met by 5 Qh4+ pushing the king back into the open.