[Event "Paris"] [Site "?"] [Round "0"] [White "Pillsbury"] [Black "Marco"] [Result "1-0"] [ECO "D55"] [Opening "QGD: 6.Nf3 b6"] {The problem of the aKnight exchange in the so-called Pillsbury position} 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 b6 7. Bd3 Bb7 8. cxd5 exd5 9. Ne5 Nbd7 10. f4 {About this time Pillsbury was getting some striking results with this system, characterized by the Knight on e5 with the strong reinforcing pawn formation d4-e3-f4. The cause of these successes lay int eh fact that nobody had yet found the right answer to the problem of whether or not to exchange the Knights} 10... c5 $2 (10... Ne8 11. Bxe7 Qxe7 12. O-O Nxe5 13. fxe5 f6 {Black can achieve some strong counterplay (Teichmann)}) 11. O-O c4 {Trading Knight is still indicated. Black starts a Queenside attack, but before this has time to become dangerous the White Kingisde initiative becomes a hurricane} 12. Bc2 a6 13. Qf3 b5 14. Qh3 g6 (14... -- 15. Nxd7 Qxd7 16. Bxh7+ {removing the guard}) 15. f5 $1 { White opens the f-file, and at once the energetic final attack is under way} 15... b4 16. fxg6 hxg6 (16... bxc3 17. Bxf6 Nxf6 18. Rxf6 hxg6 19. Bxg6 fxg6 20. Rxg6#) 17. Qh4 $1 bxc3 18. Nxd7 Qxd7 19. Rxf6 a5 20. Raf1 Ra6 21. Bxg6 $1 { A superb finish} 21... fxg6 22. Rxf8+ Bxf8 23. Rxf8+ Kxf8 24. Qh8+ Kf7 25. Qh7+ Ke8 26. Qg8# 1-0