Author: Ferdinand S. Mosca
Date: 04:22:56 08/27/01
Hi
I have attempted to analyze an interesting instructive rook and pawn ending
position in the game Quest-Ferret (1-0) in round 7 at the 18th wmcc.
[D]8/5k2/pr4p1/R5P1/P4PK1/8/8/8 b - - 0 1
Position after Quest played 51. Kxg4
I guess Ferret's 51... Ke6 reply is a mistake, it could have drawn by the move
51... Rc6.
Just an overview of the position, white should not be allowed to enter the 6th,
7th and 8th ranks without a counter attack on white's a-pawn. White is allowed
to occupy the square e5, and d5 (because there is Ke7 by black) but not on c5.
The pawn majority of white will tell that black king belongs to the kingside.
So as not to get lost on the different variations, the defence is centered on
control of c-file, the ability to attack the f/a pawns of white if white does
nothing and prevent white to have connected passed pawn. See the pgn pasted
below for possible variations.
Going through some lines I have encountered two positions which are perhaps
difficult for some programs.
[D]5k2/2R5/p5p1/r5P1/P3KP2/8/8/8 b - - 0 13
13... Kg8!!, 13... Rxa4??
[D]8/5k2/p5p1/P2R2P1/5PK1/8/8/2r5 b - - 0 4
4... Ke7!, 4... Rg1??
The move numbers (13... Kg8) refers to the pgn below and not on the actual game.
[Event "18th WMCC"]
[Site ""]
[Date "????.??.??"]
[Round "7"]
[White "Quest"]
[Black "Ferret"]
[Result ""]
[SetUp "1"]
[FEN "8/5k2/pr4p1/R5P1/P4PK1/8/8/8 b - - 0 1"]
1... Rc6 {best} 2. Re5 (2. f5 Rc4+ 3. Kf3 gxf5
4. Rxf5+ (4. Rxa6 Kg7 5. g6 Re4 6. a5 Ra4 7. Ke3 Kh6 {draw}) 4... Kg6 5. Ra5
Kh5 6. Ke3 Rg4 7. Kd3 Rxg5 {draw}) (2. Rd5 Ke7 3. Kf3 Rc3+ 4. Ke4 Rc4+ 5. Rd4
Rc5 6. Rb4 Ra5 7. Kf3 Kf7 8. Re4 Rc5 9. Rb4 Ra5 10. Rc4 Ke7 11. Rc6 Kf7 12.
Rc7+ Kf8 13. Ke4 Kg8 {best} (13... Rxa4+ {bad} 14. Ke5 Ra5+ 15. Kf6 Rf5+ 16.
Kxg6 Rxf4 17. Ra7 Ra4 18. Ra8+ Ke7 19. Kg7 a5 20. g6 Ra1 21. Ra7+ Kd6 {
white wins}) 14. Rd7 Kf8 {best} 15. Rd4 Ke7) 2... Rc4 3. a5 Rc1 4. Rd5 (4. f5
Rc4+ 5. Kf3 gxf5 6. Rxf5+ Kg6 7. Re5 Ra4 8. Rc5 (8. Rd5 Kh5 9. Ke3 Rg4 10. Kd3
Kg6 11. Kc3 Rxg5 12. Kc4 Rxd5 {draw}) 8... Kh5 9. Ke3 Rg4 10. Kd3 Kg6 11. Kc3
Rxg5 12. Kb4 Rg4+ {draw}) 4... Ke7 {better} (4... Rg1+ {bad} 5. Kf3 Rf1+ 6. Ke3
Ke6 (6... Ke7 7. Rc5 Kd7 8. Ke4 Re1+ 9. Kd5 Re2 10. Rc4 Ra2 11. Ke5 Rxa5+ 12.
Kf6 {white wins}) 7. Rc5 Kd6 (7... Kd7 8. Ke4 Re1+ 9. Kd5 Re2 10. Rc4 Re1 11.
Rb4 Ra1 12. Ke5 Rxa5+ 13. Kf6 Rd5 14. Kxg6 {white wins}) 8. Rc8 Re1+ 9. Kf3 Kd5
10. Ra8 Rf1+ 11. Kg3 Ke4 (11... Rg1+ 12. Kf2 Ra1 13. Rxa6 Ke4 14. Rf6 Rxa5 15.
Kg3 Ra1 16. Re6+ Kd5 17. Rxg6 {white wins}) 12. Rxa6 Rf3+ 13. Kg2 Rxf4 14. Re6+
Kd5 15. Rxg6 {white wins}) 5. f5 Rc4+ 6. Kf3 gxf5 7. Rxf5 Rd4 8. g6 (8. Kg3 Rc4
9. Kh3 Rd4 10. Kg3 Rc4 11. Kf3 Rd4 12. Ke3 Rg4 13. Re5+ Kf7 {draw}) (8. Rc5 Ra4
9. g6 Kf8 10. Ke3 Kg7 11. Rg5 Rh4 12. Kd3 Rf4 13. Kc3 Re4 14. Kb3 Rd4 {draw})
8... Rd6 9. Rg5 Kf8 10. g7+ Kg8 11. Ke4 Rd7 12. Ke5 Rxg7 13. Rf5 Rg1 {draw}
Regards,
Dinan
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