George Duke wrote on Wed, Aug 8, 2012 11:38 AM EDT:
Http://www.chessgames.com/perl/chessgame?gid=1044368. Game 12 played
8.August.1972 Draws. Match is in the second half, and after 12 games Fischer has won 5, Spassky 3 for scoring 7-5.
Continuing annotating Game 11, Http://www.chessgames.com/perl/chessgame?gid=1044724, 22 c5 Bb5 and both Queens are en prise. White cannot take the Bishop because 23 Qxb5 Qxb5. Instead for White, immediate Queen exchange 23 cxb6 Bxd3 should become winning for Black. If 23 Nc4 Qd8. That leaves only moving the White Queen, and anywhere off the diagonal gives Black positive exchange of Bishop for Rook.
Conclusion is that like with pivotal Game 6, one changed move gives the full point to the other side than actually won it in the championship. The earlier Game 6 [ http://www.chessgames.com/perl/chessgame?gid=1044366 ] should go for Spassky not Fischer with 15 ...Rxc5 in that one, and Game 11 here above should go for Fischer not Spassky with revised '22 ...Bb5'. Fischer's Game 11 22 ...Qb5 is weak. That's where Black goes wrong and loses Game 11.