[Event "?"]
[Site "?"]
[Date "2022.??.??"]
[Round "?"]
[White "Villeneuve, A."]
[Black "0103.10"]
[Result "1-0"]
[SetUp "1"]
[FEN "R7/2k5/8/2n2K2/P7/8/8/8 w - - 0 1"]
[PlyCount "37"]
[EventDate "2022.??.??"]
{This study was inspired by the 9th game of the La Bourdonnais-McDonnell match
of 1834, where White missed a win at the 89th move.} 1. Kf6 $3 {The natural
square e5 is mined !} (1. Ke5 $2 Kb7 $1 2. Ra5 Kb6 3. Rb5+ Kc6 $1 4. Rb4 Nd3+
$1) (1. Ra5 $2 Kc6 $1 2. Ke5 Kb6 $1 $11 {is the same}) 1... Kc6 (1... Kb7 2.
Ra5 $1 Kb6 (2... Ne4+ 3. Ke5 Nc3 4. Kd6 $1 {see main line at the 11th move}) 3.
Rb5+ $1 Kc6 4. Rb4 $3 {[#](no more fork !)} Nb7 5. Ke5 $18) 2. Kf7 $3 {[#]Again it
is impossible to go to the "e" file.} (2. Ke7 $2 Kb7 $1 3. Ra5 Kc6 $1 {[#]
(reciprocal zugzwang)} 4. Ke8 {(Kd8 impossible)} (4. Ra7 Kb6 $1 5. Ra8 Kb7 $1)
4... Kd5 $1 (4... Kd6 $2 5. Ra7 $3 {(Ra8?! Kc7!)} Kc6 6. Kd8 $1 Kb6 7. Ra8 $1
Kb7 8. Ra5 $1 Kb6 9. Rb5+ $1 Kc6 10. Rb4 $1) 5. Ra8 {(or in a7)} Kc4 $1 {
(counter-attack !)} 6. Kd8 Kb4 $1 7. a5 Nb7+ (7... Kb5 8. Kc7 Na6+ $1 9. Kc8
Nc5 $11)) 2... Kc7 (2... Kb7 3. Ra5 $1 Kc6 (3... Kb6 4. Rb5+ $1) 4. Ke7 $1 {[#]
(reciprocal zugzwang)} Kd5 (4... Nd3 5. Rh5 Kb6 6. Kd6 $18) (4... Kb6 5. Rb5+
$1 Kc6 6. Rb4 $1 $18) 5. Ra8 $1 Kc4 {(with WK in e7, this counter-attack does
not work anymore)} 6. Kd6 $1 Kb4 7. Rb8+ $1 Kc4 8. Rc8 $18) 3. Ke8 $3 {[#]The "e"
file is now approachable, but the e7 square always forbidden.} (3. Ke7 $2 Kb7
$1 4. Ra5 Kc6 $1 $11 {déjà vu}) 3... Nb7 (3... Kb7 4. Ra5 $1 Kc6 5. Ke7 $1 {
again}) (3... Kc6 4. Rc8+ Kb6 5. Rb8+ $1 Ka6 6. Rb4 $1 Nd3 7. Rb5 $1 $18) 4.
Ra6 $1 (4. Ke7 $6 Nc5 $1) 4... Nc5 (4... Nd6+ 5. Ke7 $1 ({or} 5. Kf8 $1 Nc4 6.
Re6 $1) 5... Nc8+ 6. Ke6 $1 Kb7 7. Ra5 $1 Nb6 8. Kf5 $3 {[#](again on the
departure square !)} (8. Ke7 $6 Kc6 $1 9. Kd8 Kb7 {gives nothing}) 8... Nd7 9.
Kf4 $3 {[#](the "e" file again forbidden)} (9. Ke4 $2 Kb6 $1 10. Rg5 Nc5+ $1) (9.
Ke6 $6 Kc6 10. Kf7 $3 Nc5 11. Ke7 $3 {is our ZZ again}) 9... Kb6 10. Rd5 $1 Kc6
11. Rh5 Kb6 12. Ke3 $1 Ka6 13. Kd4 Nb6 14. a5 $1 Nc8 15. Kc4 Nd6+ 16. Kb4 $18)
5. Ra5 $1 Kd6 $1 (5... Kc6 6. Ke7 $1 {again}) 6. Ra7 $1 Kc6 7. Kd8 $1 Kb6 8.
Ra8 $1 {The 4 squares of the half-file were visited !} Kb7 9. Ra5 $1 Ne4 (9...
Kb6 10. Rb5+ $1 Kc6 11. Rb4 $1 {déjà vu}) (9... Kc6 10. Kc8 $1 Kb6 11. Rb5+ $1)
10. Kd7 $1 {Or Ke7.} Nc3 11. Kd6 $1 Kb6 12. Ra8 $1 Kb7 13. Rh8 $1 {Or Rg8.} (
13. Rf8 $2 {(too close)} Ne4+ $1 14. Ke5 (14. Kd5 Nc3+) 14... Nc5 $1 15. Rf4 (
15. Kd6 Ne4+ $1 {repeats}) 15... Nd3+ $1) 13... Nxa4 (13... Kb6 14. Rb8+ $1 Ka5
15. Ra8+ $1 Kb6 16. a5+ $1) (13... Ne4+ 14. Ke5 $1 Nc5 15. Rh4 $1) 14. Rh4 $3 {[#]}
Nc3 (14... Nb6 15. Rb4 $1 Ka7 16. Kc6 Nc8 17. Kc7) 15. Kc5 $1 Ka6 (15... Ne2
16. Re4 Ng3 17. Rg4 Ne2 18. Kc4) 16. Rc4 $1 Ne2 17. Rc2 Nf4 18. Kc6 Ka5 19. Rd2
$1 1-0
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