Fischer vs Mednis: help me understand this game

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RedColossus

Could someone help me understand why Fischer resigned this game?  He seems poised to capture either the A or H pawn, so I'm wondering why he figured the game was lost.  Also, what is the point of 21. KH1?



blueemu

In the final position, 73. ... Re8 wins a piece.

21. Kh1 : to get off the Rook's file? Avoiding ... Nf4, perhaps?