WMD: This game is analysed in Kasparov's OMGP-III.
8.Ba3! 'An excellent novelty, prepared by Portisch after the failure in his game with Fischer in Santa Monica, which went 8.Qf3 0-0 9.e4 dxe4 10.Nxe4 Nxe4 11.Qxe4 Qd7!!'
14...Nh5 'And Black immediately makes a bad mistake! It seems to me that Fischer's handling of such complicated positions, when the opponent had the initiative, was not very successful. This was not his sort of play - too ragged and difficult for the development of a clear plan.'
25.Bxc5!! 'a brilliant stroke, radically solving the problem of the a3 bishop'.
28.Qf3? 'Portisch nevertheless misses the win, by making the worst of possible moves. Later he pointed out 28.Qe4! Qg5 (28...Nxe6 29.axb5) 29.Kh1 h3 (29...Nd3 30.Qf3!) 30.g3 Nd3 31.e7!, winning.' 28.Qxc4 is given by Kasparov as an alternative win.