In olden days the second time control came at move 56. The Yugoslav grandmaster, a subtle player, would have benefited from that option had it existed. He makes a bad mistake. Ivkov shows with some impressive analysis what is wrong with 55...ilxd5. There would follow 56.4xd5 &xg4

57.1,gl £ie5 58.4c5 &f3 (58...<£k4 59.4xb5 <£)d6+ 60.4a6 &xf5 61.1x5) 59.1*2 <£d2 60.4xb5 <^e4 61 .¿el <£d6 + 62.4a6! (62.4c5? £}xf5 63.b5 4c7=) 62...4c6 (on

62...<£>xf5 63.b5 £sd6 64.b6 4c6, 65.iLb4 with the idea 1*8 wins) 63.1*2 ^b5 64.1.b6 <£d6 65.1x5 &b5 (65...&xf5 66.1*8) 66.1*8 foc7+ 67.4a5 <£d5 68.1.xg7 £*4

69.1.xh6 (or 69.1.xf6 <£xh5 70.b5 + 4b7 71 ,l,e5H—) 69...^xh5 70.4a6 4c7 71 .b5 and White wins.

It would be interesting to know how Karpov would have reacted to

55...Ae8!. This was a resilient option, leaving White no clear way to win.

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