comment: A new and strong move.
context: 1. e2e4  1... e7e5  2. f1c4  2... g8f6  3. d2d3  3... c7c6  4. g1f3  4... d7d5  5. c4b3  5... a7a5  6. a2a4  6... f8b4  7. c2c3  7... b4d6  8. e4d5  8... c6d5  9. c1g5  9... c8e6  10. b1a3 This is the idea behind ​​White's play. The knight finds a good square on b5. 10... b8c6  11. a3b5  11... d6b8 Keeping the bishop is important because it protects the center. Eventually, Black can develop the rook on a6. 12. d1e2 An ambitious idea that Rapport has already tried in a blitz game. White prepares to castle queenside. 12... e8g8  13. e1c1  13... f8e8  14. h1e1  14... h7h6  15. g5h4 The moves from both sides are the most natural after 13.Qe2. One question I have here is whether Black can play g7-g5 to get out of the pin. This is always a difficult move to evaluate in this type of position, leaving us to wonder whether it's worth weakening the kingside and if White can sac the knight on g5. 15... d5d4 