Exchange of Fianchettoed Bishop
Tigran Petrosian - Florian Gheorghiu
Moskow, 1967
1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. g3 Bb4 5. Bg2 O-O 6. O-O Re8 7. d3 h6 8. Nd5 Bf8 9. Nxf6+ Qxf6 10. Nd2 d6 11. Ne4 Qd8 12. Nc3 Bd7 13. b4 Qc8
With his last move Black is intending to trade light-squared bishops on h3. Petrosian could have played 14. Re1 to avoid the trade but he has something else on his mind. The main point is that Black will lose couple of tempos Qc8-Bh3-Bg2 to complete the trade and White can use that time to fulfill his own plans.
14. Rb1 Bh3 15. e4
Closing the long diagonal but it doesn’t really matter anymore. Black has already lost too many moves and he can’t afford the luxury of not trading Bg2. If bishop retreats to e6 or d7, White can play f4 gaining big advantage.
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