Four Fischer Analytical Errors

The diagrammed position arose just after the position in Kasparov Stops Fischer's Attack. Instead of Larsen's 23...e5, Fischer commented that 'On 23...e6 24.gxf7+ Kxf7 (24...Rxf7 25.Bxe6) 25.Bxg7 Kxg7 26.Rg1+ Kh7 27.Qg2 Qe5 28.Qg6+ Kh8 29.Rg5 Rg7 30.Rxh5+ Kg8 31.Bxe6+ Kf8 32.Rf5+ Ke7 33.Rf7+ wins'.

Portoroz Interzonal 1958
Larsen, Bent

Fischer, Robert
(After 23.g5-g6)
[FEN "2r3k1/2r1ppb1/3p2P1/pq5p/1p1BP3/1B3P2/PPPQ4/1K1R4 b - - 0 23"]

Kasparov noted that Fischer's analysis contains four errors that he called 'holes'. Each would have avoided the subsequent analytical error.

• 27.Bxe6 Rf8 28.Bd5 Qe8 29.e5 Kh8 30.Be4 wins
  
• 27...Qe8 draws
  
• 29.Bxe6 wins
  
• 30...Qxh5 31.Qxh5+ Rh7 32.Qxh7+ Kxh7 33.Bxe6 Rf8 draws

Fischer made four analytical errors in a single variation? Extraordinary!