from chessgames.com

1. Nf3 Nf6 2. c4 g6 3. Nc3 Bg7 4. d4 O-O 5. Bf4 d5 6. Qb3 dxc4 7. Qxc4 c6 8. e4 Nbd7 9. Rd1 Nb6 10. Qc5 Bg4 11. Bg5 {11. Be2 followed by 12 O-O would have been more prudent. The bishop move played allows a sudden crescendo of tactical points to be uncovered by Fischer. -- Wade} Na4 {!} 12. Qa3 {On 12. Nxa4 Nxe4 and White faces considerable difficulties.} Nxc3 {At first glance, one might think that this move only helps White create a stronger pawn center; however, Fischer's plan is quite the opposite. By eliminating the Knight on c3, it becomes possible to sacrifice the exchange via Nxe4 and smash White's center, while the King remains trapped in the center.} 13. bxc3 Nxe4 {The natural continuation of Black's plan.} 14. Bxe7 Qb6 15. Bc4 Nxc3 16. Bc5 Rfe8+ 17. Kf1 Be6 {!! If this is the game of the century, then 17...Be6!! must be the counter of the century. Fischer offers his queen in exchange for a fierce attack with his minor pieces. Declining this offer is not so easy: 18. Bxe6 leads to a 'Philidor Mate' (smothered mate) with ...Qb5+ 19. Kg1 Ne2+ 20. Kf1 Ng3+ 21. Kg1 Qf1+ 22. Rxf1 Ne2#. Other ways to decline the queen also run into trouble: e.g., 18. Qxc3 Qxc5} 18. Bxb6 Bxc4+ 19. Kg1 Ne2+ 20. Kf1 Nxd4+ {This tactical scenario, where a king is repeatedly revealed to checks, is sometimes called a "windmill."} 21. Kg1 Ne2+ 22. Kf1 Nc3+ 23. Kg1 axb6 24. Qb4 Ra4 25. Qxb6 Nxd1 26. h3 Rxa2 27. Kh2 Nxf2 28. Re1 Rxe1 29. Qd8+ Bf8 30. Nxe1 Bd5 31. Nf3 Ne4 32. Qb8 b5 {Every piece and pawn of the black camp is defended. The white queen has nothing to do.} 33. h4 h5 34. Ne5 Kg7 35. Kg1 Bc5+ 36. Kf1 Ng3+ {Now Byrne is hopelessly entangled in Fischer's mating net.} 37. Ke1 Bb4+ 38. Kd1 Bb3+ 39. Kc1 Ne2+ 40. Kb1 Nc3+ 41. Kc1 Rc2# 0-1

11.Be2 analysis Rybka 4.1 06 April, 2013

[+0.18]  d=32  11...Re8 12.Qa3* Nh5 13.Be3 Qc7 14.e5 e6 15.0-0 f6 16.exf6 Nxf6 17.Rfe1 Nbd5 18.Bg5 Bf5 19.Ne5 a5 20.Bd3 Qb6 21.Nxd5 Nxd5 22.Bc4 h6  

[+0.21]  d=32  11...Nfd7 12.Qa3 Re8 13.e5 Nf8 14.Be3 Be6 15.Ng5 Bc4 16.Bxc4 Nxc4 17.Qb3 b5 18.0-0 a6 19.h3 Qc7 20.Nce4 h6 21.Nf3 Ne6 22.Qc3 Red8 

[+0.26]  d=32  11...Bxf3 12.Bxf3 Nfd7 13.Qa3 e5 14.dxe5 Re8 15.Be2 Qe7 16.Qxe7 Rxe7 17.f3 Nxe5 18.Bg5 Ree8 19.Kf2 Nec4 20.Bc1 Red8 21.g4 Bd4+ 22.Kg3 Be5+ 23.Kh3 f6 24.Kg2 Kg7

[+0.27]  d=30  11...Qc8 12.0-0 Re8 13.Qa3 Nfd7 14.e5 Be6 15.Ng5 Nc4

[+0.29]  d=29  11...a5 12.0-0 Bxf3 13.Bxf3 Nfd7 14.Qa3 e5 15.dxe5 Nc4

After 11.Be2 Re8

*(a) [+0.19]  d=32  12.O–O e5 13.dxe5 Nfd7 14.Qa3 Qe7 15.Qxe7 Rxe7 16.Nd4 Bxe2 17.Ndxe2 Bxe5 18.Bxe5 Nxe5 19.b3 Ned7 20.f3 a5 21.Rd4 Nc5 22.Rc1 Ne6 23.Rdd1 f6 24.Nd4 Kf7 25.Nxe6 Kxe6

(b) [+0.16]  d=32  12.Qa3 Nh5 13.Bc1 Qd6 14.Qxd6 exd6 15.h3 Be6 16.O–O Nf6 17.Ng5 Bc4 18.Bxc4 Nxc4 19.b3 Nb6 20.Rfe1 h6 21.Nf3 Bf8 22.Kh2 a5 23.a4 d5 

(c) [+0.14]  d=32  12.Qb4 Nfd7 13.Be3 Bxf3 14.Bxf3 a5 15.Qb3 a4 16.Qc2 Nc4 17.e5 Nxe3 18.fxe3 Bh6 19.Kf2 Nb6 20.Rhe1 Qc7 21.Re2 Rf8 22.Kg1 Rfd8 23.b3 a3 24.Qe4 f6  

(d) [+0.15]  d=27  12.Qg5 Qc8 13.Bc1 Bxf3 14.gxf3 Rd8 15.O–O e6 16.a4 Nbd7 17.Qh4 Qc7 18.Bg5 Re8 19.f4 Qa5 20.Rd2 Rac8 21.Rfd1

Note that the continuation 11.Be2 Nfd7 12.Qa3 Bxf3 13.Bxf3 e5 14.dxe5 Qe8 15.Be2 Nxe5 16.0-0 has this likely continuation:

a) 16...Qe6

[+0.26]  d=32  17.Bc1 Ned7 18.f3 Rfe8 19.Qd6 Qxd6 20.Rxd6 Be5 21.Rd2 Nc5 22.Rfd1 Rac8 23.Kf2 f5 24.exf5 gxf5 25.g3 Kg7 26.Bf1 Kf6 27.Kg2

b) 16...Nec4

[+0.36]  d=32  17.Qb3 Qe6 18.Bc1 Rad8 19.Rfe1 Rd4 20.f4 Rfd8 21.e5 g5 22.Bxc4 Qxc4 23.Qxc4 Nxc4 24.Rxd4 Rxd4 25.b3 Nb6 26.fxg5 Nd7 27.Ne4 Bxe5 28.Bb2 Rxe4 29.Rxe4 Bxb2 30.Re7 Nc5 31.b4 Kf8 32.Rc7