context: 1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. e2e3  4... b7b6 Black has many options in this classic Nimzo-Indian line. 5. f1d3  5... c8b7  6. g1f3  6... e8g8  7. e1g1  7... c7c5  8. c3a4 This move highlights the problem of not capturing the knight earlier. If you play similar positions with Black, always watch out when White castles and gets rid of the knight pin. If you forget about it, you might find yourself with a trapped bishop. 8... c5d4 The bishop prepares to come back. 9. a2a3 There's a small detail White has to keep in mind when choosing this instead of 9.exd4. In 1999, I played 9.a3 with White and thought I was very clever doing so, but fifteen minutes later, I wasn't sure anymore. Actually, I'm still not sure about it 25 years later. 9... b4e7  10. e3d4  10... d8c7 I didn't know this move. I used to play 10...d6, when White is slightly better but it's not a big deal. 11. f1e1 This prevents 11...Ng4, which can simply be answered by 12.h3, but allows Black to play 11...d5. 11... d7d5  12. c4c5 The only way to fight for an advantage. 12... b6c5  13. a4c5  13... e7c5  14. d4c5  14... c7c5 White has sacrificed a pawn, but it's clear there's good compensation with both bishops pointing at Black's king. 15. c1f4 A new move and not the most accurate. 15... c5b6  16. f3e5 The bishop is a little less menacing on f4, but of course, Black has to be careful. 16... b7a6 The best way to fight against the bishop pair is to try to exchange one of the bishops. Sarana, naturally refuses it, but the bishop on c2 gives Black some extra tactical chances. 17. d3c2  17... f8c8 