[Event "US Junior Championship"] [Site "Memphis, TN"] [Date "1976.06.??"] [Round "2"] [White "Diesen"] [Black "Tisdall"] [Result "1/2-1/2"] [ECO "E52"] [WhiteElo "2467"] [BlackElo "2453"] [Annotator "Fritz 9 (30s)"] [PlyCount "83"] [EventDate "1976.??.??"] {E52: Nimzo-Indian: Rubinstein: 4...0-0 5 Nf3 d5 6 Bd3 b6} 1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. d4 b6 5. e3 Bb7 6. Bd3 O-O 7. O-O d5 8. Bd2 Bd6 9. Rc1 a6 10. cxd5 exd5 11. Ne5 Nbd7 {last book move} 12. Nxd7 Qxd7 13. Ne2 Ne4 14. Be1 Rae8 15. f3 {White threatens to win material: f3xe4} Nf6 16. Qd2 Qe7 {Black threatens to win material: Qe7xe3} 17. Bf2 h5 (17... c5 18. Rce1 $11) 18. Ng3 g6 {Prevents intrusion on f5} 19. Ne2 Nh7 (19... c5 20. Bc2 $14) 20. Nc3 f5 21. Rce1 (21. Qe2 $5 $16) 21... Nf6 $11 22. Bh4 Qg7 23. f4 (23. Kh1 Qh6 $11) 23... c5 (23... c6 24. Na4 Qc7 25. Nc3 $11) 24. Bc2 c4 {Black wins space} 25. Rf3 Kh7 26. Bd1 Qd7 27. Rg3 {Black has an active position} Kg7 28. Bxf6+ Kxf6 {Black has the pair of bishops} 29. Qf2 Kf7 {Black king safety improved} 30. Rh3 Rh8 ( 30... Qe6 31. a3 $11) 31. Nb1 $14 Bb4 {Black threatens to win material: Bb4xe1} 32. Re2 b5 {White has a cramped position} 33. a3 {White threatens to win material: a3xb4} Ba5 34. b4 (34. Nd2 $5 $14) 34... cxb3 $11 35. Bxb3 Rc8 36. Rc2 (36. Qf1 $5 $11 {should be considered}) 36... Rxc2 $17 37. Bxc2 Rc8 38. Rf3 (38. Qe2 $5 $17) 38... Qc6 39. Bd3 Qc1+ 40. Qf1 Qb2 {White has a cramped position. White's piece can't move: b1} (40... Be1 $142 $5 41. Qe2 Re8 $19) 41. Rf2 $17 {White threatens to win material: Rf2xb2} Qb3 42. Qe2 1/2-1/2