[Event "RCS blog"] [Site "?"] [Date "2017.??.??"] [Round "?"] [White "Rusz, Árpád"] [Black "?"] [Result "1-0"] [SetUp "1"] [FEN "8/5N2/2N5/8/3Kp3/kP2Pr2/8/8 w - - 0 1"] [PlyCount "95"] [EventDate "2017.??.??"] 1. Nfe5 Rxe3 $1 2. Nc4+ $1 (2. Kxe3 $2 Kxb3 $11) 2... Ka2 $1 {Triangulation} ({ If black captures the pawn immediately, the win is much easier:} 2... Kxb3 3. Nxe3 Ka3 4. Kc3 Ka4 5. Kc4 Ka3 6. Nd4 Ka4 7. Nb3 Ka3 8. Nc5 $18 {etc.}) 3. Nxe3 Kxb3 {The pawn is securely blockaded by a white knight exactly on the Troitzky line, so white must win. The win is surprisingly difficult: white can win only by reaching the same position but with black to move! This can be done only by an 45-move-long manoeuvre!! The play is determined except some duals which can be regarded as minor ones. Cyclic zugzwang - WTM.} 4. Nd8 ({minor duals} 4. Ne5 Kb4 5. Ng6 Kb5 6. Nf4) (4. Ne7 Kb4 5. N7d5+ (5. Ng6 Kb5 6. Nf4) 5... Kb5 6. Ke5 (6. Nf4) 6... Kc6 7. Nf4) 4... Kb4 5. Ne6 Kb5 6. Nf4 Kc6 7. Ke5 Kd7 8. Kd5 Kc7 9. Ke6 Kc6 10. Ne2 $1 Kc5 11. Kd7 Kb6 12. Kd6 Kb5 13. Kd5 $1 {Critical position A} Kb6 (13... Kb4 14. Kc6 $18) 14. Nd4 Kb7 15. Ke6 Ka6 16. Ne2 $1 Kb7 17. Kd6 Kc8 18. Nf4 ({minor dual} 18. Nd4 Kd8 19. Nc6+ Kc8 20. Na5 Kd8 21. Nb7+ Ke8 22. Ke6 Kf8 23. Nd6 {etc. reaching the main line}) 18... Kd8 19. Ne6+ ({ minor dual} 19. Nh3) 19... Ke8 20. Ng5 Kd8 21. Nf7+ Ke8 22. Ke6 Kf8 23. Nd6 Kg7 24. Kf5 Kh7 25. Kf6 Kh6 26. Ndf5+ ({minor dual} 26. Nb5) 26... Kh5 27. Ng3+ ({ minor dual} 27. Nd4) 27... Kh4 28. Ne2 $1 Kh5 29. Kf5 $1 {Critical position B, which looks like position A, but reflected vertically!} Kh6 {The black king has to return...} (29... Kh4 30. Kg6 $18) 30. Nf4 Kg7 31. Ke6 Kf8 32. Nh5 Ke8 33. Ng7+ Kd8 34. Kd6 Kc8 35. Ne6 Kb7 36. Kc5 Ka6 37. Kc6 Ka5 38. Nc7 ({minor dual} 38. Nd4) 38... Kb4 39. Nb5 Ka4 40. Kc5 Kb3 41. Kd4 Kb4 42. Nc7 Ka5 43. Kc5 Ka4 44. Ncd5 Ka5 45. Nb4 Ka4 46. Nc6 Ka3 47. Kd5 $3 {Triangulation} ({After } 47. Kd4 $2 Kb3 {we should start again with the 45-move long manoeuvre...}) 47... Kb3 48. Kd4 $1 {Cyclic zugzwang - BTM} 1-0