Hard-Talkchess-2019 set

[peter]

Not sure if this one had a solution, it was tough for every engine. H6 (with Nalimov) found a mate score on my hardware in under an hour, but it took a couple more hours to settle on +M33. This is a cool puzzle.

That's a study by Leonid Kubble from 1925 and I have stored a #31 in my database:


8/p5pq/8/p2N3p/k2P3P/8/KP3PB1/8 w - - 0 1

1. Be4 Qh6 2. Bd3 Qd2 3. Be2 g6 4. f3 a6 5. f4 Qc2 6. Bd1 Qxd1 7. Nc3+ Kb4 8.
Nxd1 Kc4 9. f5 gxf5 10. Ne3+ Kxd4 11. Nxf5+ Ke5 12. Ng7 Kf4 13. Ka3 Kf3 14. Ka4
Kf4 15. Kxa5 Kf3 16. b4 Kg4 17. Kxa6 Kxh4 18. Kb5 Kg4 19. Nxh5 Kf3 20. Kc5 Kg4
21. b5 Kg5 22. b6 Kg6 23. Kd5 Kxh5 24. b7 Kg4 25. Ke4 Kg5 26. b8=Q Kf6 27. Qe8
Kg5 28. Qc6 Kh4 29. Qg6 Kh3 30. Kf3 Kh2 31. Qg2# 1-0

[Paloma]

Hi Peter,

i have this as a mate in 29 stored.

9. Ka3 is better than 9. Ne3+

9. Ka3 Kxd4 10. Ka4 Ke4 11. Kxa5 Kxf4
12. b4 g5 13. hxg5 Kxg5 14. Kxa6 h4 15. b5 h3 16. b6 h2 17. Nf2 Kf6 18. Nh1 Ke7
19. b7 Kf6 20. b8=Q Kf5 21. Qxh2 Ke4 22. Nf2+ Kd5 23. Qf4 Ke6 24. Nh3 Kd7 25.
Qf6 Ke8 26. Nf4 Kd7 27. Nd5 Kc8 28. Qe7 Kb8 29. Qb7#