Eyal: This was indeed Kasparov’s first use of the Grunfeld in a serious competitive game and Karpov, who was probably surprised by it, chose the relatively peaceful 7.Rc1. The critical line in this variation, which Kasparov, according to his notes, was prepared to play is 7.cxd5 Nxd5 8.Qxd5 Bxc3+ 9.Bd2 Be6 (sacrificing a second pawn for the initiative) 10.Qxb7 Bxd2+ 11.Nxd2 O-O:

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And in case of 12.Qxa8 Black can force a draw by perpetual with 12...Rd8 13.b4 (13.Rd1? Bd5) 13...Qxb4 14.Rd1 Rxd2 15.Rxd2 Qb1+ 16.Rd1 Qb4+ 17.Rd2 Qb1+ etc. Shortly before the match, Black got a very strong initiative in Dreev vs Epishin, 1986 after 12.e4 Nc6. Later, however, it was established that 12.b4! pretty much refutes Black’s idea, though it demands some very accurate play by White (the move was already tried in K Grigorian vs Tseshkovsky, 1977, but analysis showed that Black’s play there could be improved). It’s quite obvious why Karpov avoided entering such a line without preparation in the first game of the match, but it’s interesting that he kept avoiding it in all the later Grunfeld games as well, either taking Kasparov’s analysis "on trust" or reaching by himself the same – apparently erroneous – conclusion about the line.

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