Author: Paulo Soares
Date: 01:13:54 05/02/00
Go up one level in this thread
On May 01, 2000 at 14:06:18, Laurence Chen wrote:
>On April 30, 2000 at 10:46:55, Harald Faber wrote:
>
>>This position is a nice test of endgame knowledge for programs:
>>
>>Which program(s) avoid 1.Bxh7?? g5+!! 2.hxg6+ Kg7 3.Rg8+ Kh6 and draw, white has
>>no chance to enter the black fortress.
>>
>>[D]7R/5kpp/8/7P/4BK2/8/8/3r4 w - - am Be4h7;bm Kf4e5 Kf4g3;id
>>Sax-Kovacevic,Sarajewo 1982;
>This position is a draw, I cannot see anyway how can White win, for this reason
>I don't think that 1.Bxh7 is a mistake at all because it is up to Black to find
>the move 1.... g5+!!. Hence, the question should be, which programs find 1. ...
>g5+ after 1. Bxh7 to secure the draw?
>There's no win for White if Black finds the correct move(s). If I am wrong,
>show me with a variation that White can win.
>Laurence
I don't know if I understood rigth the one that you wrote, but in the initial
position that Harald placed, I think that white win.
[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Harald"]
[Black "?"]
[Result "*"]
[Annotator "Soares,P"]
[SetUp "1"]
[FEN "7R/5kpp/8/7P/4BK2/8/8/3r4 w - - 0 1"]
[PlyCount "35"]
1. Ke5 Re1 (1... h6 2. Ra8 Rf1 3. Bd5+ Ke7 4. Ra7+ Kf8 5. Kd6 g5 6. Rh7 Rf6+ (
6... Rf2 7. Rxh6 Kg7 8. Rg6+ Kh7 9. Ke6 Rf8 10. Be4 Re8+ 11. Kf5 Rg8 12. Kg4
Rf8 13. Re6+ Kg8 14. h6 Kh8 15. Kxg5 {+-}) 7. Ke5 Rf2 8. Rxh6 Rh2 (8... Kg7 9.
Rg6+ Kh7 10. Be4 Kh8 11. h6 Rf8 12. Rg7 g4 13. Rxg4 Rg8 14. Bg6 Rc8 15. Rd4 Rg8
16. Kf6 Ra8 17. Rd7 {+-}) 9. Rh7 g4 10. h6 Rd2 11. Rh8+ Ke7 12. h7 {+-}) (1...
Rd7 2. Bd5+ Ke7 3. Rxh7 Kf8 4. h6 {+-}) (1... Ra1 2. Bd5+ Ke7 3. Rxh7 Rg1 4.
Be4 Rg5+ 5. Bf5 Rg1 6. Rh8 Rh1 7. Be4 Rh2 8. Rh7 Kf8 9. Bd5 Rf2 (9... Re2+ 10.
Kd6 {+-}) (9... Rd2 10. Rh8+ Ke7 11. Rg8 Re2+ 12. Kf5 Rf2+ 13. Kg6) 10. Rh8+
Ke7 11. Rg8 Re2+ 12. Kf4 Kf6 13. Rf8+ Ke7 14. Rf7+ Kd6 15. Bf3 Re7 16. Rxe7
Kxe7 17. Kg5 {+-}) 2. Ra8 Re2 (2... Rf1 3. Bxh7 Re1+ 4. Be4 Rf1 5. Bg6+ Ke7 6.
Re8+ Kd7 7. Rg8 Re1+ 8. Be4 Rg1 9. h6 Rg5+ 10. Bf5+ Kc6 11. Rxg7 {+-}) 3. Ra7+
Kf8 (3... Kg8 4. h6 gxh6 (4... g6 5. Ra8+ Kf7 6. Rh8 Re1 7. Rxh7+ Kg8 8. Rg7+
Kh8 9. Rxg6 Rc1 10. Rd6 Rc8 11. Kf6 Re8 12. Bg6 Rf8+ 13. Bf7 Kh7 14. Rd7 Rb8
15. Bg6+ Kh8 16. Rh7+ {+-}) 5. Kf6 Rf2+ 6. Bf5 Rxf5+ 7. Kxf5 {+-}) 4. Kf4 h6 (
4... Rf2+ 5. Kg5 Rf1 (5... Rf7 6. Rxf7+ Kxf7 7. Bxh7 {+-}) (5... g6 6. h6 Re2 (
6... Rf7 7. Rxf7+ Kxf7 8. Bd5+ {+-}) 7. Bd5 Re7 (7... Rd2 8. Kf6 Rf2+ 9. Ke6
Re2+ 10. Kd6 Re8 11. Rxh7 {+-}) 8. Rxe7 Kxe7 9. Bc4 Kf8 10. Kf6 {+-}) 6. Bxh7
Rg1+ 7. Kf5 Rf1+ 8. Ke5 Re1+ 9. Be4 Re2 10. Ra8+ Ke7 11. Kf5 Re1 12. Ra7+ Kf8
13. Bd5 Rf1+ 14. Ke5 Rf6 15. Be6 Rh6 (15... Rf1 16. Kd6 Rd1+ 17. Bd5 {+-}) 16.
Rf7+ Kg8 17. Rf3+ Kh7 18. Bf5+ g6 19. Bxg6+ {+-}) 5. Kf5 Re1 6. Bd5 Rg1 (6...
Rd1 7. Ke6 Re1+ 8. Kd6 Re8 (8... Re2 9. Rf7+ Ke8 10. Rxg7 Rf2 11. Rg6 {+-}) 9.
Rf7+ Kg8 10. Re7+ Kf8 11. Rxe8+ Kxe8 12. Ke5 {+-}) 7. Ke6 (7. Ra2 Ke7 (7...
Rf1+ 8. Kg6 Rf6+ 9. Kh7 Rf5 10. Ra8+ Ke7 11. Ra7+ Kf8 12. Be4 Rxh5 (12... Rf7
13. Rxf7+ Kxf7 14. Bd5+ Kf8 15. Kg6 {+-}) (12... Rc5 13. Bg6 Rc7 14. Ra8+ Ke7
15. Kxg7 Ke6+ 16. Kxh6 Rb7 17. Rf8 Rc7 18. Bf5+ Ke5 19. Kg5 Rg7+ 20. Bg6 Rb7
21. h6 Ke6 22. h7 {+-}) 13. Bg6 Rg5 14. Rxg7 h5 15. Rf7+ Ke8 16. Rf5+ Rxg6 17.
Kxg6 {+-}) 8. Rg2 Rf1+ 9. Kg6 Kf8 10. Re2 Rg1+ 11. Kh7 Rg5 12. Be4 Re5 13. Rf2+
Ke7 14. Bg6 Kd6 15. Kxg7 Re6 16. Kxh6 {+-}) 7... g5 (7... Re1+ 8. Kd6 Re8 9.
Rd7 Re1 10. Rf7+ Ke8 11. Rxg7 Rf1 12. Rg6 {+-}) 8. Kd6 (8. Kf6 Re1 (8... Rf1+
9. Kg6 g4 10. Kxh6 g3 (10... Rf5 11. Be4) 11. Kg6 Rf2 12. h6 g2 13. Ra1 Rb2 14.
Be6 Rb6 15. Kf6 {+-}) 9. Be6 Rf1+ 10. Bf5 Re1 11. Ra8+ Re8 12. Rxe8+ Kxe8 13.
Kg7 {+-}) 8... Rf1 (8... g4 9. Rf7+ Ke8 10. Rf6 Rd1 11. Rxh6 {+-}) 9. Rh7 Rf6+
(9... g4 10. Rxh6 Kg7 11. Rg6+ Kh7 12. Be4 Kh8 (12... Ra1 13. Ke5 Ra5+ 14. Kf6
Ra6+ (14... Rxh5 15. Rg7+ {+-}) 15. Kf7 Ra7+ 16. Kf8 Ra4 17. Re6+ Rxe4 18. Rxe4
{+-}) (12... Rf7 13. Rf6+ Kg7 14. Rg6+) 13. Ke5 g3 14. Rxg3 Rf7 15. Rd3 Re7+
16. Kf4 Rg7 17. Bf5 Rg2 18. Rd6 Rf2+ 19. Ke5 Re2+ 20. Kf6 Rg2 21. h6 Rg1 22.
Rd7 Rg2 23. Rh7+ Kg8 24. Rb7 Kh8 25. Rc7 Rg1 26. Rg7 {+-}) 10. Be6 g4 11. Ke5
Rf1 12. Bxg4 Kg8 13. Rxh6 Rf2 14. Bf5 Rh2 15. Rd6 Rb2 16. Kf6 Rb8 17. Kg6 Kh8
18. Be6 {+-} *
Paulo Soares, from Brazil
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