5.f3 is the Sämisch Variation, a well-known and popular line in the King's Indian. I remain noncommittal with regards to my king, with castling both queenside or kingside possible depending on what black does.

14...b5 varying from Savon-Gufeld USSR 1967 which I had been following and now I am on my own and things start to go wrong quickly.

17.Qxd6 is a mistake and the reply 17... Nd4 is also a mistake.
Stockfish 18 shows the classy diagonal take over; 17...Qa5+ 18.Bd2 Qb6 19.Rc1 Rfc8.

Today in 2026, I think I, a pawn up, should be trying to win. But it seems I appear to be worried by ghosts and do not want to face the passed central pawn, while I can see my way to a draw. 15.Nxf6+ was dubious, I should maintain the tension, 15.b3 and enjoy the extra space in a level position.