Nº17 Daniele Gatti

Draw

Daniele Gatti (Italy)

wKh1,Qa2,Pa7,c7,d3,d4/bKd7,Nd8,Re8,Pb5,b7,c6,e6,f2,f3,g3

1. Qd5+! exd5 2. c8=Q+
2. cxd8=Q+? Rxd8! And mate at next move

2… Kd6 3. Qb8+ Kd7 4. Qc8+ Kd6 5. Qb8+ Ke7 6. Qc7+ Ke6 7. Qe5+ Kd7 8. Qg7+ Re7 9. Qg4+ Re6 10. Qg7+ Re7 11. Qg4+ Kc7 12. Qxg3+ Kb6 13. a8=S+! Thematic Move

Thematic Logical Try 13. Qxf2? Kxa7! 14. Qxf3 Se6 15. Qf6 Rh7+ 16. Kg1 Sc7 17. Qf8 Sa6! Queen arrived in 8th rank without tempo gaining and Black can defend from check in c5 and rearrange his forces -+.

13… Ka7 14. Qxf2 Kxa8 15. Qxf3 Se6 16. Qf6 Rh7+ 17. Kg1 (Kg2 minor dual) Sc7 18. Qf8+! Tempo gain Ka7 19. Qc5+! Ka8 20. Qf8+ Ka7 21. Qc5+ Ka6 22. Qa3+ Kb6 23. Qc5+ Ka5 24. Qa3+ Kb6 25. Qc5+ Ka5 25. Qa3+ Kb6 (= perpetual check)

After 17. … Ka7, occurs the same position as in the thematic try, but with White to move. This is enough to achieve perpetual check.

Tested with Stockfish 14 with 5-men tablebases installed.