Spassky vs Tal 1979

Hi all,

Looking at a famous game and puzzled about a particular variation! Any help here would be appreciated - let me know how you see the following.

The Spassky vs Tal from Montreal 1979 is featured in chess lessons and books, and I think it's a beautiful ending by Tal - see the game below. 20. - Bxh2 21. Kxh2 and Spassky is in definite trouble.

I have yet to come across an analysis of 21. Kf1, in which case the game is much less clear to me. Without computer analyses I would say that 21. - Rh5 22. Re1 and 23. g3 leads to only a small advantage for black - but that's a hobby player's view.

What do you think? Thanks for any input you might have.

Thanks a lot for your thoughts! So in your brief analysis 21. Kf1 and 22. Kxh2 23. Kg3 both lose for white - but just less clearly so than 22. Khx2 23. Kg1.