Benkő-90 JT
2019
2nd Prize
White wins
1. e5 Nc3 2. Nf6! 1st knight opposition 2. Kd7? Ne4! (2... Nxa4? 3. Kc6 +-) 3. Kc6 Ng5 = 2... Kc4 2... Nxa4 3. Kd6 Kd4 4. e6 Nb6 5. Kc7 Ke5 6. e7 +- 3. Kd6 Ne2 4. Nh5! 2nd knight opposition 4... Nd4 5. Ng7! 3rd knight opposition 5... Kb4 1st cyclic zugzwang - WTM. In order to win, white has to reach the same position but with BTM. A move is lost by a king triangulation (3 moves) plus a knight switchback (2 moves) while the black knight moves only 4 times.
cyclic zugzwang - WTM
6. Kd5 Ne2 7. Nh5! Nc3+ 8. Kc6! Ne2 9. Kd6 Nd4 10. Ng7! White has managed to transfer the move to black but black has a tempo move. 10... a5
cyclic zugzwang - WTM
11. Kd5 Ne2 12. Nh5! Nc3+ 13. Kc6 Ne2 14. Kd6 Nd4 15. Ng7! White ends the second cycle but black has another tempo move. 15... a6 15... Nb5+!? 16. axb5 a4 17. Nf5/Ne6 a3 18. Nd4 Kc3 (18... a2 19. Nc2+ Kc3 20. Na1 Kb2 21. e6 Kxa1 22. e7 Kb2 23. e8=Q +-) 19. b6! axb6 20. Nb5+ +-
cyclic zugzwang - WTM
16. Kd5 Ne2 17. Nh5! Nc3+ 18. Kc6 Ne2 19. Kd6 Nd4 20. Ng7! The third cycle finishes. Black has no more tempo moves...
cyclic zugzwang - BTM
20... Kxa4 21. Kc5 Nb3+ 22. Kc4 Nd2+ 23. Kd5 +- 20... Kc4 21. e6 Nxe6 22. Nxe6 Kb4 23. Nc5 +-
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