Interesting Endgame Position

[Nordlandia]

[d]1Nq5/8/5pk1/7p/8/6P1/5P1P/1R4K1 w - - 0 1
White to move.

Can white hold with optimal play in this position?

The knight is offside but black pawns is isolated so white do have some practical chances of creating fortress by placing rook on f4.

[hgm]

What do you mean by 'hold'? Win? Rb4, Rf4 seems to trivially draw.

[RJN]

FinalGen should be able to find results for that position, but not sure how long that would take.

http://finalgenchess.ovh/home_ing.php

[Nordlandia]

What do you mean by 'hold'? Win? Rb4, Rf4 seems to trivially draw.

Draw

It turns out that white can sacrifice the knight & place the rook on f4.
[pgn]
[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "1Nq5/8/5pk1/7p/8/6P1/5P1P/1R4K1 w - - 0 1"]
[PlyCount "8"]

1. Rb4 Qc1+ 2. Kg2 Qc5 3. Rf4 Qb5 4. Nd7 Qxd7 5.Rh4 Qb7+ 6.Kg1 Qd5 7.Rf4 f5 8.Rb4 Qc5 9.Rf4 Qc1+ 10.Kg2 Qc6+ 11.Kg1 Qd6 12.Kg2 Qd3 13.Kg1 Kf6 14.Kg2 Qd2 15.Kf1 Kg5 16.Rh4 Kg6 17.Kg2 Qd3 18.Kg1 Kf6 19.Kg2 Kg5 20.Rf4 Qd5+ 21.Kg1 Qd1+ 22.Kg2 Qc2 23.Rd4 Qc5 24.Rf4 Qc1 25.Rd4 Qc6+ 26.Kg1 Qc5 27.Rh4 Qc1+ 28.Kg2 Qc6+ 29.Kg1 Qd6 30.Rf4 Qd2 31.Kf1 Qc1+ 32.Kg2 Qc6+ 33.Kg1 Kf6 34.Rd4 Qc5 35.Rh4 Qc1+ 36.Kg2 Qc6+ 37.Kg1 Qd7 38.Kf1 Qd1+ 39.Kg2 Qd5+ 40.Kg1 Qf3 41.Rd4 Qc3 42.Rh4 Qa1+ 43.Kg2 Qa8+ 44.Kg1 Kg5 45.Rb4 Qa2 46.Rf4 Qb2 47.Kf1 Qb5+ 48.Kg2 Qb7+ 49.Kg1 Qd5 50.Rh4 Qc5
-+ (-3.94) Depth: 64/92 00:00:13 375MN, tb=2778669[/pgn]
-+ (-3.94) Depth: 64/92 00:00:13 375MN, tb=2778669

[hgm]

Indeed, that is an obvious fortress. So there isn't much interesting about the position. Just keep shuttling the Rook between f4 and h4, and the King between g1 and g2 when checks necessitate it.