Crosskill

[Event "?"] [Site "?"] [Date "1864.??.??"] [Round "?"] [White "Crosskill, A."] [Black "0410.00"] [Result "1-0"] [SetUp "1"] [FEN "k7/6R1/2K5/8/2B5/8/8/7r w - - 0 1"] [PlyCount "97"] [EventDate "1864.??.??"] [SourceDate "2022.01.01"] {Crosskill 2 EFIII 1193 & 1188. p.13-19} 1. Bd3 $3 {[#]} (1. Bd5 $2 Rh6+ $8 2. Kc7+ Ka7 $8 $11) 1... Rh6+ $1 (1... Re1 2. Bf5 $3 (2. Bc4 $6 Rh1 $1 3. Bd3 $8 {: text}) 2... Re3 (2... Re2 3. Rg3 $1) (2... Rd1 $6 3. Be4 $8) 3. Bd7 $3 {[#]} Kb8 { (a ...Rf6+ would draw)} (3... Rb3 4. Be6 $8 Rb7 5. Rg2 $1 Ka7 {(...Rh7 Rg8+ or ...Rb1 Ra2+)} 6. Bd5 $8) (3... Ka7 4. Be6+ $8 Kb8 5. Bd5 $8 {as below}) 4. Rg4 $3 Rb3 $1 (4... Rc3+ 5. Kb6 $8 Rb3+ 6. Bb5 $8 Rc3 7. Bc4 $8 ) 5. Be6 $3 Rb2 $1 (5... Rb1 6. Rg8+ $8 Ka7 7. Rg7+ $8 Kb8 8. Bd5 $8) (5... Rb7 6. Bd5 $8) 6. Rg3 $3 {[#]} (6. Bc4 $6 {(Crosskill's original idea)} Rh2 $1 7. Rg8+ $8 Ka7 8. Rg7+ $8 Ka8 {(sinon Rb7-b1)} 9. Kc7 $1 {(or Bd3!)} Rh6 10. Bd3 $8 { : text on 2nd move}) (6. Rg7 $2 Rc2+ $8) (6. Rg8+ $2 Ka7 7. Rg7+ Ka6 $8 {(that would be losing with bR on b1)} 8. Bc4+ Ka5 $8 9. Ra7+ Kb4 10. Rb7+ Kc3 $11) 6... Rc2+ 7. Kb6 $8 Rb2+ $1 8. Bb3 $8 Kc8 9. Kc6 $8 Kb8 (9... Kd8 10. Kd6 $8) 10. Rg8+ $8 Ka7 11. Rg7+ $8 Kb8 12. Bd5 $8 Rf2 $1 13. Rg8+ $8 Ka7 14. Be4 $3 {[#]} Rb2 15. Rg1 $1 Rb6+ 16. Kc5 $8 Ra6 17. Rg8 $8 Ra5+ 18. Kc6 $8 Rh5 19. Rg7+ $1 Ka6 20. Bd5 $8 Ka5 21. Kc5 $8 Rh6 22. Rb7 $1 {Philidor}) (1... Kb8 2. Rg8+ $8 Ka7 3. Be4 $8 Rh3 4. Bd5 $8 Rh2 5. Bg2 $8) (1... Rc1+ $6 2. Kb6 $8 Kb8 3. Bf5 $8) (1... Rh3 $6 2. Kb6 $8 Rh6+ 3. Bg6 $8 Rh8 4. Be4+ $8 Kb8 5. Bb7 $3 Rf8 6. Rg4 $1) 2. Kc7 $3 (2. Bg6 $2 Kb8 $1 (2... Rh4 $1) (2... Rh3 $2 3. Be4 $8)) 2... Rf6 $1 (2... Re6 $6 3. Bb5 $8 Ka7 4. Rg1 $1 Re7+ 5. Bd7 $8 {: ...Rf6 would draw }) (2... Ka7 $6 3. Rg1 $1) 3. Rh7 $8 (3. Bc4 $6 Rh6 $1 4. Bd3 $8 Rf6 5. Rh7 $8) (3. Bb5 $2 Ka7 $8 4. Rg1 Rf7+ $8 5. Bd7 Rf6 $8 $11) 3... Ka7 $1 (3... Rf8 $6 4. Bc4 $3 {(return) : voir AV 2018}) (3... Rf4 $6 4. Bb5 $8 Ka7 5. Kc6+ $1) (3... Rf2 $6 4. Be4+ $8 (4. Bb5 $6 Ka7 5. Bc4 $8 Rc2 6. Kc6+ $8) 4... Ka7 5. Kc6+ $8) 4. Re7 $3 {[#]Adolf Zytogorski's ZZ (1843).} Rf8 $1 (4... Rf2 5. Bc4 $8 (5. Kc6+ $2 Kb8 $8 6. Re8+ Ka7 7. Be4 Rb2 $3) 5... Rc2 (5... Rh2 {(...Rf4?! Bb5!! . ..Rf5 Kc6+!! for Kb6 & Bd7!!)} 6. Kc6+ $8 {(Bd3?!)} Kb8 {(...Ka8?! Kb6!!)} 7. Rb7+ $8 Ka8 $1 {(...Kc8 Be6+!!)} 8. Rb1 $8 {(Rb4? ...Rh4! or on h1)} Rc2 $1 { (...Rg2 Bd3!! ; idem on ...Ka7)} 9. Rb4 $8 {below}) 6. Kc6+ $8 Kb8 (6... Ka8 $6 7. Kb6 $8) 7. Rb7+ $8 Ka8 (7... Kc8 8. Rb4 $8 Kd8 {(...Rd2 Bd5!)} 9. Kd6 $8 Rd2+ 10. Bd5 $8) 8. Rb4 $8 {(and squares g1, h1, g4, and h4 are inaccessible: see the 13th )} Rg2 $1 9. Bd3 $3 {: text on 14th}) (4... Rf3 5. Bc4 $8 Rc3 6. Kc6+ $8 Kb8 7. Rb7+ $8 Ka8 8. Rb4 $8 Rg3 9. Bd5 $8) ({White to move :} 4... -- $11 5. Rg7 (5. Bc4 Rh6 $3 {[#](...Rg6? Rh7!!)} 6. Rg7 {(with wRh7 and bRg6, it would be Lolli's ZZ)} Rh8 $1 {(or on h1)} 7. Bd3 Rg8 $1) (5. Bb5 Rh6 $1 {(or on b6)}) 5... Re6 $1 (5... Rf4 $1 6. Bb5 {(Kc6+ ...Kb8!!)} Rf6 $8 7. Rg1 Rf7+ $8 8. Bd7 Rf6 $8 $11 {Lolli 2}) (5... Rf8 $1 6. Bb5 Rf6 $8) ( 5... Rb6 $2 6. Kc8+ $8 Ka8 7. Be4+ $8) 6. Bc4 Rh6 $8 $11) (4... Rf4 $6 5. Kc6+ $1 (5. Bb5 $1 Rf5 6. Kc6+ $8 Kb8 7. Kb6) 5... Kb8 6. Re8+ $8 Ka7 7. Be4 $8 Rf7 8. Kc5 $8) (4... Ka8 $6 5. Bb5 $8 Ka7 6. Re1 $1 Rf7+ 7. Bd7 $8 Rf6 8. Be6 $8 Ka6 9. Re5 $8) (4... Rh6 $6 5. Re5 $1) (4... Rb6 $6 5. Kc8+ $8) 5. Bb5 $3 Rg8 $1 (5... Rh8 $6 6. Kc6+ $8 Kb8 (6... Ka8 7. Kb6 $8 Rb8+ 8. Ka6 $8 Rf8 9. Bd7 $1 Kb8 10. Kb6 $8 Rg8 11. Bc6 Kc8 12. Ra7 $8) 7. Kb6 $8 Kc8 8. Rc7+ $8 Kd8 9. Rd7+ $8 Kc8 (9... Ke8 10. Rh7+ {Compare with variation 6 Kc6+? below}) 10. Rd6 $3 {[#]} (10. Rc7+ $6 Kd8 11. Rd7+ $8 Kc8 12. Rd6) 10... Rg8 (10... Kb8 11. Bd3 $1 Rg8 12. Bf5 Rf8 13. Re6 $1 Rh8 {(...Ka8 Re7!)} 14. Rf6 Rg8 15. Bd7 Ka8 16. Rf7) 11. Be2 $1 (11. Bc4) 11... Rf8 12. Bg4+ Kb8 13. Rc6 (13. Bf5) (13. Re6) 13... Rg8 14. Bd7 $1 Rf8 15. Re6 Rd8 16. Re5) (5... Rb8 $6 6. Kc6+ $8 Ka8 7. Kc5 Rf8 8. Kb6 Rb8+ 9. Ka6 Rf8 10. Bc4 Rf6+ 11. Be6 $8 Rf8 12. Ra7+ Kb8 13. Rb7+ $3 Ka8 14. Bd5) (5... Rf6 $6 6. Re1 Rf7+ 7. Bd7 $8 Rf6 8. Be6 $8) 6. Re1 $3 (6. Re4 $6 {(tempo less : see 13th)} Rg7+ $1 7. Bd7 $8 Rg6 8. Be6 $8 Rg7+ 9. Kc6 $8 Rg1 10. Ra4+ $8 Kb8 11. Rb4+ $8 Ka7 12. Rb7+ $8 Ka8 13. Rh7 $3 {[#]} (13. Re7 $2 Re1 $1 { (or on h1)}) (13. Rf7 $6 Rh1 $1 14. Kb6 $8 Rb1+ 15. Kc5 $8 Kb8 16. Bd5 $8 Rg1 17. Rb7+ $8 Kc8 18. Re7 $8) 13... Rg6 (13... Rg2 14. Bf5 $8) (13... Rg3 $6 14. Kb6 $1) (13... Re1 14. Bd5 $1 Rc1+ 15. Kd6+ $8) 14. Re7 $8 {: text}) (6. Re2 $6 Rg7+ $1 7. Bd7 $8 Rg6 8. Be6 $1 Rg7+ 9. Kc6 $8 Rg1 10. Ra2+ $8) (6. Kc6+ $2 {(would win if bR was on h8, see black 5th)} Kb8 $8 (6... Ka8 $2 7. Kb6 $8) 7. Kb6 Kc8 $8 8. Rc7+ Kd8 $8 9. Rd7+ Ke8 $8 10. Rg7+ Kf8 $8 $11) 6... Rg7+ $1 7. Bd7 $8 Rg6 $1 8. Be6 $8 {Compared to Lolli 2, wR helps Bishop to reawaken.} (8. -- Rh6 $1 (8... Rb6 $1 9. Bc6 Rb7+ $8) (8... Rf6 $2 9. Be6 $8) 9. Be6 Rh7+ $8 10. Kc6 Rh6 $1 (10... Rh8 $1) (10... Rh2 $2 11. Ra1+ $8 Kb8 12. Rb1+ $8 Ka7 13. Rb7+ Ka8 14. Rb4 $3 {[#]: see Lolli 2 , 11...Rh2?}) 11. Ra1+ Kb8 12. Rb1+ Ka7 $8 13. Rb7+ Ka8 $8 (13... Ka6 $2 14. Re7 $8 Ka5 15. Kc5 $8) 14. Re7 Rh1 $1 $11 {or on h2}) (8. Ra1+ $2 Ra6 9. Rb1 Rg6 $1 $11 {: see also Lolli 2}) 8... Rg7+ $1 (8... Ka6 $6 9. Re5 $8 Rg7+ 10. Bd7 $8 Rh7 11. Rg5 $1 Re7 (11... Rf7 12. Rg4 $1) 12. Rg6+ $8) 9. Kc6 $8 (9. Bd7 $6 Rg6 $1 10. Be6 $8) 9... Rg6 $1 {it would be draw with bR on h6, see 8th white move.} (9... Rg3 $1 10. Ra1+ $8 Kb8 11. Rb1+ $8 Ka7 $1 (11... Ka8 $6 12. Kc7 $8 Rc3+ 13. Kb6 $8 Re3 14. Bd5+ $8 Kb8 15. Kc6+ $8 Kc8 16. Kd6 $8) 12. Rb7+ $8 Ka8 $1 (12... Ka6 $6 13. Bc4+ $8 Ka5 14. Kc5 $8) 13. Re7 $8 Rg2 14. Bf5 {: text}) (9... Rg2 $6 10. Bf5 $8 (10. Rc1 $6 Rh2 11. Ra1+ $8 Kb8 12. Rb1+ $8 Ka7 13. Rb7+ Ka8 14. Rb4 $1) (10. Ra1+ $6 Kb8 11. Rb1+ $1 {(or 11 Bf5!)} Ka7 12. Rb7+ $1 {(or Bf5! ...Ra2 Rb7-b3!!)} Ka8 13. Rh7 $8 Rg6 14. Re7 $8) 10... Rb2 (10... Rg3 11. Ra1+ $8 Kb8 12. Be4 $8 Rg7 13. Rh1 $1 {: see 16...Kb8}) (10... Rg8 11. Ra1+ $1 Kb8 12. Be4 $8) 11. Ra1+ $8 Kb8 12. Be4 $8 (12. Rg1 $6 Rb7 13. Be4 $8 Rb3 14. Ra1 $8) 12... Rb4 (12... Re2 13. Bd5 $8 Rh2 14. Rb1+ $8 Ka7 15. Be4 $8 Rh6+ 16. Kc5 $8 Rb6 { : text on 29th}) 13. Bd5 $8 Rb7 14. Rh1 $1 Rb2 15. Be4 $8 Rb3 16. Rh7 $8 Rc3+ 17. Kd6 $8 Rc7 {: text on 29th}) (9... Rg5 $6 10. Ra1+ $8 Kb8 11. Rb1+ $8 Ka7 12. Bd5 $8 Rg3 13. Ra1+ $8) (9... Kb8 $6 10. Rb1+ $8 Ka7 (10... Ka8 11. Bd5 $8 Rg6+ 12. Kc5+ $8 Ka7 13. Rb2 $1 Rh6 14. Rb7+ $8 Ka6 15. Rb8 $8) 11. Bd5 $8 Rg3 (11... Rg6+ 12. Kc5 $8) 12. Ra1+ $8 Kb8 13. Be4 $8 {: see 16...Kb8}) (9... Ka8 $6 10. Ra1+ $1 (10. Bf5 $1 Rb7 11. Be4 $8 Kb8 12. Rh1 $8 Rb3 13. Rh7 $8 Rc3+ 14. Kd6 $8 Rc7 {: text on 29th}) 10... Ra7 {(...Kb8 Rb1+!! above)} 11. Rg1 $3 Ra6+ (11... Rh7 12. Rg8+ $8 Ka7 13. Bd5 $8 Rb7 {(...Rh2 Bg2!!)} 14. Rg1 $1 Rh7 15. Ra1+ $8 Kb8 16. Rb1+ $8 Ka7 17. Kc5 $8) 12. Kc7 $8 Ra7+ 13. Kc8 $8 Ra6 14. Bd7 $8 Ra3 15. Rc1 $8 Ka7 16. Kc7 $8 Ka6 17. Rc5 $8 Ka7 18. Bh3 $1 Ka8 19. Bg2+ $1 Ka7 20. Bf1 $1 Ra1 (20... Ra2 21. Rc4 $1 Ra1 22. Rb4 $1) 21. Rc3 $1 Ra2 22. Bb5 $1 Ra1 23. Rd3 $1 {Z} Ra2 24. Bc6 $1 Ka6 25. Rd8 $8) (9... Rh7 $6 10. Ra1+ $8 Kb8 11. Rb1+ $8 Ka7 12. Bd5 $8 Rh2 13. Be4 $8 Rh6+ 14. Kc5 $8 Rb6 {: text on 29th}) (9... Rb7 $6 10. Bd5 $8 Rg7 11. Be4 $1 Rf7 12. Rb1 $3 {[#]} Rf6+ 13. Kc5 $8 Rb6 {idem}) (9... Re7 $6 10. Ra1+ $8 Kb8 11. Rb1+ $8 Ka7 12. Bd5 $8 Rg7 13. Kc5 $8 Rg6 14. Rb2 $1 {: see 9...Kb8}) 10. Ra1+ $8 Kb8 11. Rb1+ $8 (11. Re1 $2 Rh6 $3 (11... Rf6 $2 12. Rb1+ $8) 12. Rb1+ Ka7 $8 $11) 11... Ka7 $1 ( 11... Ka8 $6 12. Kc7 Rg7+ 13. Bd7 $8) 12. Rb7+ $8 Ka8 (12... Ka6 13. Re7 $8 Ka5 14. Kc5 $8 Rg5+ 15. Bd5 $8) 13. Re7 $8 Rg2 $1 {This position, marked with 6 crosses on squares a6, b7, e1, e2, h1, and h2, is signed by a British megalomaniac in a 1994 book!} (13... Rg1 $6 14. Bf5 $3 {: see AV 2018}) (13... Rf6 $6 14. Kb6 $8 (14. -- Rf2 $1 15. Bd5 $8) 14... Rf8 15. Bd5+ $1 Kb8 16. Bb7 $3 {Z} (16. Bc6 $2 Kc8 $8) 16... Rf6+ (16... Rh8 17. Re5 $1) 17. Bc6 $8 Rf8 18. Ra7 $8) (13... Rg3 $6 14. Kb6) 14. Bf5 $3 {[#]Kind of echo of the first move, which prevents ...Rg6+ and a future ...Rb1+.} (14. Bd5 $6 Rg6+ $1 15. Be6 $8 (15. Kc7+ $6 Ka7 16. Be6 $8 Rg2 17. Kc6+ $8) 15... Rg2 16. Bf5 $8 {: text}) ( 14. Bc4 $6 Kb8 $1 (14... Rg6+ $6 15. Kc7 $8 Ka7 16. Rh7 $3 {: Lolli's ZZ ; text on 23th}) 15. Rb7+ $8 Ka8 $1 16. Rb1 $8 Rc2 17. Rb4 $8 Rg2 {(back on 13th move)} 18. Bd3 $3) 14... Rf2 $1 (14... Rb2 $6 15. Be4 $1 Kb8 16. Kd6 $8 Rd2+ (16... Rb4 17. Bc6 $1 Rd4+ 18. Bd5 $8 Rb4 19. Re1 $1 Rb6+ 20. Bc6 $8 Ka7 21. Kc5 $8) 17. Bd5 $8 Rc2 18. Rf7 $1 {Philidor}) (14... Kb8 $6 15. Be4 $8 Rg3 (15... Rb2 16. Kd6 $8 {above}) 16. Rb7+ $8 {(see 13...Rg1)}) (14... Rg3 $6 {(or on g8, h2)} 15. Be4 $1 {(see 13...Rg1)}) (14... Rg1 $6 {(or on g5)} 15. Kb6) 15. Re5 $3 {[#]} (15. Be4 $6 Rf6+ $1 16. Kc7+ $3 Ka7 $1 17. Bd3 $8 {and we are back on the 4th move}) 15... Rf3 $1 (15... Rb2 16. Be4 $8 Kb8 17. Re7 $3 ( 17. Rh5 $6 Rb3 $1 18. Rh7 $3 Rc3+ 19. Kd6 $8 Rc7 20. Rh3 $1) (17. Rg5 $2 Rb3 $3 18. Rg7 Rc3+ $8 19. Kd6 Rh3 $3 $11) 17... Rb3 18. Bd5 $3 (18. Rh7 Rc3+ 19. Kd6 $8 Rc7 20. Rh2 Rc8 21. Ra2 $8) 18... Rc3+ 19. Kd6 $8 Rc2 20. Rf7 $1 Rc1 21. Rb7+ $8 Kc8 22. Ra7 $8 Kd8 23. Rf7 $1) (15... Kb8 $6 16. Rb5+ $8 Ka7 17. Kc7 $8 Ra2 18. Rb7+ $8 Ka8 19. Rb8+ $8 Ka7 20. Be4 $8) (15... Ka7 $6 16. Kc7 $8 Ra2 17. Be4 $8) (15... Rf1 $6 16. Kb6 $8) (15... Rf4 16. Be4 $1 (16. Re8+ $1 Ka7 17. Be4 $8) 16... Rf6+ 17. Kc7+ $8 Ka7 18. Bc6 $8) 16. Be6 $3 {[#]} (16. Be4 $2 Rc3+ $8 17. Kb6+ Kb8 $8 $11) 16... Rf1 (16... Rf2 17. Bc4 $3 (17. Ra5+ $1 Kb8 18. Bd5 $8 Rh2 19. Rb5+ $8) 17... Rb2 18. Rg5 $1 Kb8 19. Rg8+ $8 Ka7 20. Rg7+ $8 Kb8 21. Bd5 $8 Rf2 22. Rg8+ $8 Ka7 23. Be4 $8 Rb2 24. Rg1 $1 Rb6+ 25. Kc5 $8) ( 16... Kb8 {(...Ka7 Ra5+!!)} 17. Rb5+ $8 Ka7 $1 (17... Ka8 $6 18. Kb6 $8 Kb8 { (...Rf1 Bc4!!)} 19. Rg5 $1 Rf8 20. Bd7 $3 Rh8 21. Bc6 $8) 18. Rb7+ $3 { (indicated by “Euclid” -- Crosskill's alias? -- Berger tells us)} (18. Ra5+ $6 {(Rc5?! ...Rg3!)} Kb8 19. Bd5 $6 {(Rb5+!)} Rg3 $1 {(...Rh3 Be4!!)} 20. Rb5+ $8 {(Be4? ...Rg7!!)} Ka7 $1 21. Rb7+ $8 Ka8 22. Rh7 $3 Rg6+ 23. Kc7+ $8 {: text on 22nd ; Zyto's initial analysis}) 18... Ka8 $1 (18... Ka6 $6 19. Bc4+ $8 Ka5 20. Kc5 $8 Rf5+ 21. Bd5 $8) 19. Rb1 $3 {[#]} (19. Re7 $6 Rf2 $1 20. Bd5 $1 Kb8 $1) (19. Rb2 $6 Rc3+ $1 20. Kb6 $8 Rc1 $1 21. Bf5 $8 Rc3 22. Rb1 $8 Kb8 23. Rb4 $3 {back to Zyto's ZZ}) 19... Ka7 $1 (19... Rc3+ $6 20. Kb6 $8) 20. Ra1+ $8 Kb8 21. Bd5 $8 Rg3 22. Be4 $8 Rg7 (22... Rg4 23. Rb1+ $8 Ka7 24. Rb4 $1 Rg7 25. Kc5 $8 Rg5+ 26. Bd5 $8) 23. Rh1 $1 Ka7 (23... Rc7+ 24. Kd6 $8 {: text on 29th}) 24. Rb1 $8 Rg4 (24... Re7 25. Bd5 $8 Rg7 26. Kc5 $8 Rg6 27. Rb2 $1) 25. Rb4 $1 Rg7 26. Kc5 $8 Rg5+ 27. Bd5 $8 Rg6 28. Rb1 $1 Rh6 29. Rb7+ $8 Ka6 30. Rb8 $8 Ka5 31. Rb3 $1 {Philidor}) (16... Rg3 $6 17. Kc7 $1 Rc3+ 18. Kb6 $8 Rc2 19. Bb3 $1 Rc8 20. Ra5+ $8 Kb8 21. Bd5 $8) 17. Ra5+ $8 (17. Bf5 $6 Rf3 $1 18. Be6 $8 Rf1 19. Re3 $6 (19. Ra5+ $1) 19... Kb8 20. Rb3+ $8 Ka7 21. Ra3+ $8 Kb8 22. Bd5 $8 Rg1 23. Rb3+ $8 Ka7 24. Rb7+ $8 Ka8 25. Rh7 $8 {: text on 21st}) 17... Kb8 18. Bd5 $8 (18. Rb5+ $6 Ka7 19. Rb7+ $2 (19. Ra5+ $8) 19... Ka8 $8 20. Rb4 Rc1+ $8 21. Bc4 Rh1 $1 {(or on g1)} 22. Kb6 Kb8 $3 (22... Rh6+ $2 23. Kc5 $3 Ka7 24. Bd5 $8) 23. Bd5 Rh6+ $1 (23... Rc1 $1)) 18... Rg1 $1 (18... Rb1 $6 19. Kd6 $8 Kc8 20. Ra4 $1 Rb6+ (20... Rb2 21. Rf4 $1) 21. Bc6 $8 Rb1 22. Rf4 $1 Rd1+ (22... Kb8 23. Rf8+ $8) 23. Bd5 $8 Kb8 24. Ra4 $8) (18... Rf6+ $6 19. Kd7 $8 Ra6 20. Rb5+ $8 Ka7 21. Rb7+ $8 Ka8 22. Rc7+ $8 Kb8 23. Rc8+ $8 Ka7 24. Kc7 $8) 19. Rb5+ $8 Ka7 (19... Kc8 $6 20. Kd6 $8) 20. Rb7+ $8 (20. Rb4 $2 Rc1+ $8) 20... Ka8 (20... Ka6 21. Bc4+ $8 Ka5 22. Kc5 $8 Rg5+ 23. Bd5 $8) 21. Rh7 $8 (21. Rf7 $2 Rg6+ $8 22. Kc7+ Ka7 $8 23. Bc4 Rh6 $8 {(compare with text)} 24. Bd3 Re6 $8 25. Rg7 Re1 $3 $11) (21. Re7 $6 {(Euclid)} Rg6+ $1 22. Kc7+ $6 (22. Be6 $1) 22... Ka7 23. Bc4 $2 (23. Be6 $8) 23... Rh6 $8 24. Rg7 Rh1 $1 $11) 21... Rg6+ $1 (21... Kb8 22. Be4 $8 Rc1+ 23. Kd6 $8 {: text on 29th}) 22. Kc7+ $8 Ka7 $1 23. Bc4 $3 {[#]It's Lolli's ZZ.} Rg5 $1 24. Kc6+ $8 Kb8 25. Rh8+ $8 Ka7 26. Bd5 $8 Rg1 $1 27. Rh7+ $8 Kb8 28. Be4 $8 Rc1+ $1 {Not considered by Zytogorski at this point: but he analyzes it with wR on f7, which corresponds to move 31 in the text.} (28... Rg3 $6 29. Kd6 $8 Re3 30. Rb7+ $1 (30. Bd5 $1) 30... Ka8 31. Re7+ $8 Kb8 32. Re8+ $8 Ka7 33. Kc7 $8 {Zytogorski} Ka6 34. Bb7+ $8) 29. Kd6 $8 Rc7 $1 {Would draw if wR was on e7, see Doncevic-Brito 1989.} 30. Rh2 $1 (30. Rh1 $1 Rc8 $1 31. Ra1 $8 Rd8+ $1 32. Kc6 $8 Rd2 33. Bd5 $6 {Zytogorski} (33. Rb1+ $1 Kc8 34. Bd5 $8) 33... Rh2 $1 {: back to 26th move after a symmetry!}) 30... Rc8 $1 31. Ra2 $8 Rd8+ $1 32. Kc6 $8 Rd1 $1 33. Rb2+ $8 Kc8 34. Bd5 $8 Kd8 35. Kd6 $8 {Philidor.} Rc1 36. Rb7 $1 Kc8 37. Ra7 $1 Kd8 (37... Rb1 38. Rf7 $1) 38. Rf7 $1 Re1 39. Bf3 $8 Re3 40. Bc6 $8 Rd3+ 41. Bd5 $8 Re3 42. Rd7+ $8 Ke8 43. Ra7 $1 Kf8 44. Rf7+ $8 Ke8 45. Rf4 $8 Kd8 (45... Rd3 46. Rg4 $1 Rxd5+ 47. Kxd5 Kf7 48. Ke5 Ke7 49. Rg7+ {and mate on 55th}) 46. Be4 $8 Ke8 47. Bc6+ $1 Kd8 48. Rf8+ Re8 49. Rxe8# 1-0