Analysis by Fritz.

1.d4 Nf6 2.Nf3 g6 3.Nc3 d5 4.Bf4 Bg7 5.e3 0-0 6.Ne5 Nh5 7.Bg3 Nxg3 8.hxg3 c5 9.Be2 cxd4 10.exd4 Nc6 11.Nxc6 bxc6 12.Na4 e5 13.dxe5 Bxe5 14.Qd2 f5 15.Rd1 f4 16.gxf4 Rxf4 17.Nc5 Bxb2? [There is a win here with 17...Rh4 18.Rxh4 Qxh4 19.Bf3 Bxb2 ]

18.Nd3? [White could have taken the rook, since it appears that black doesn't have adequate compensation for the sacrificed material: 18.Qxf4 Qa5+ 19.Kf1 Qxc5 20.Qh4 ]

18...Rh4 This is the strange position that attracted so much attention. No one was quite sure whether there was a win here for Alex or not, but from now on both players find the best moves and the computer's evaluation of the position never shifts from 0.00, indicating a draw.

19.Rxh4 Qxh4 20.Nxb2 All other moves lose.

20...Qh1+ 21.Bf1 Ba6 [Black could try 21...Bg4 22.f3 Qh4+ 23.Qf2 Re8+ 24.Be2 Qh1+ 25.Kd2 Qh6+ 26.Kc3 , but it seems that White can escape with the extra material.]

22.Qe3 Again, the only move to draw.

22...Bxf1 [22...Qxf1+ 23.Kd2 Qxg2 24.Qe6+ Kg7 25.Qe7+ Kh6 26.Qh4+ draws]

23.Qe6+ Kg7 24.Qe7+ Kh6 25.Qe3+ Kg7 [Black cannot avoid the perpetual, as the following analysis shows: 25...g5 26.Qe6+ Kg7 (26...Kh5?? 27.g4+ Kh4 28.Qh6+ Kxg4 29.Qxh1 and White wins) 27.Qe7+ draws; as does 25...Kh5 26.Qe5+ Kh6 (26...g5? 27.g4+ Kg6 28.Qf5+ Kg7 29.Qxg5+ Kf7 30.Kd2 , with a significant advantage for White.) 27.Qe3+ ]

26.Qe7+ Kh6 27.Qe3+ 1/2-1/2