[Event "?"] [Site "?"] [Date "2025.10.07"] [Round "?"] [White "Attacking R behind lone pawn, Win"] [Black "?"] [Result "*"] [Annotator "peter"] [SetUp "1"] [FEN "8/8/6k1/r7/P5KP/R7/8/8 w - - 0 1"] [PlyCount "45"] [EventDate "2025.??.??"] [SourceVersionDate "2025.10.07"] {[#]This is a straightforward win. White creates a lateral position with pawns on the same rank} 1. Ra1 (1. Kf4 {immediately also wins}) 1... Kg7 (1... Kh6 2. Kf4 Kh5 (2... Rh5 3. a5) 3. Ra2 {actually not as efficient as 3.Ke4 but on the other hand this move means White does not have to calculate anything} (3. Ke4 {also wins}) 3... Kg6 (3... Ra6 4. a5 {does not help Black}) (3... Kxh4 4. Rh2#) 4. Ke3 Kf5 5. Rf2+ Ke5 6. Rf4 {reaching the lateral position}) 2. Kf4 (2. h5 $2 Kh6 $11 3. Kf4 Kxh5 4. Ke4 Kg5 5. Kd4 Kf5 6. Kc4 Ke5 7. Kb4 Ra8 {and the black king is close enough to hold this position}) 2... Kf6 (2... Kh6 3. Ke4 Kh5 (3... Rh5 4. a5 Rxh4+ 5. Kd5 Rh5+ 6. Kc6 Rg5 7. a6 Rg6+ 8. Kc5 Rg5+ 9. Kd4 Rg4+ 10. Ke3 Rg3+ 11. Kf2 Rg8 12. Rh1+) 4. Kd4 Kxh4 {is far too slow for Black} 5. Kc4 Kg5 6. Kb4 {and the a-pawn will push through}) 3. Ke4 Ke6 4. Kd4 Kd6 5. Kc4 Kc6 (5... Rh5 6. Rd1+ Kc6 7. Rd4 $18 {reaching the lateral position. With the black king cut off the white king heads to the kingside} Re5 8. Kd3 Ra5 9. Ke4 Rh5 10. Kf3 Kc5 11. Rf4 Kd6 12. Kg4 {etc}) 6. Kb4 Kb6 (6... Rh5 7. Rc1+ Kb6 8. Rc4 {reaching the lateral position}) 7. Rc1 Rh5 8. Rc4 {Reaching the lateral position. We have already seen this. The Black king is cut off and the White king heads to k-side and wins. This is straightforward but I give a couple of illustrative lines.} Ka6 9. Kc3 Ka5 10. Kd3 Rh7 11. Ke3 Rh8 12. Kf3 Kb6 13. Kg4 Rg8+ 14. Kf5 Rf8+ 15. Kg6 Rg8+ 16. Kh7 Rd8 17. Rf4 {preparing to cover the Wihte king from checks.} Rd5 18. Kg6 Rd2 19. h5 Rg2+ 20. Kh7 Kc7 21. h6 Kd6 22. a5 Ke7 (22... Kc7 23. Rf7+ Kb8 24. Rg7 Rc2 25. Kg6 $18 Rg2+ 26. Kf5 $18) 23. Ra4 $18 *