Author: Bruce Moreland
Date: 14:15:17 09/24/00
Go up one level in this thread
On September 24, 2000 at 16:38:03, Vincent Diepeveen wrote:
>On September 24, 2000 at 15:49:54, Bruce Moreland wrote:
>
>>I think this is fun. It only took an hour or so to do, and the file is 17 mb.
>>It is interesting that this case is so hard on a small board.
>
>Amazing!
>
>nevertheless if kings are not on the same edge, then it is a win too,
>for example:
>
>white Ka1,Ra2,Nb1
>black Ke5, Rd4
>
>any side to move. Is this won too?
[FEN "6/4k1/3r2/6/R5/KN4 w"]
{
a b c d e f
+---+---+---+---+---+---+
6 | |///| |///| |///| 6
+---+---+---+---+---+---+
5 |///| |///| |/k/| | 5
+---+---+---+---+---+---+
4 | |///| |/r/| |///| 4
+---+---+---+---+---+---+
3 |///| |///| |///| | 3
+---+---+---+---+---+---+
2 | R |///| |///| |///| 2
+---+---+---+---+---+---+
1 |/K/| N |///| |///| | 1
+---+---+---+---+---+---+
a b c d e f
}
1. Kb2 Rd3 { Ke4 } 2. Ra4 { Kc2 } Rd4 3. Ra1 Rd3 { Rc4 } 4. Nc3 Rd2+ 5. Kc1
{ Kb3 } Rd3 { Rf2 } 6. Ra3 { Kc2 } Rd6 { Kd4, Kf4, Kf5 } 7. Ra4 { Kc2 } Rd3
{ Ke6, Kf5 } 8. Kb2 Rd2+ { Rf3, Kd6, Kf5 } 9. Kb3 Rd6 { Kf5 } 10. Kc2 Rf6 11.
Kd2 Rf3 12. Ra3 Rf2+ { Ke6 } 13. Ke3 Rb2 14. Ra5+ Kd6 { Ke6 } 15. Kd3 Ke6 16.
Kc4 Rd2 17. Rb5 Rf2 18. Kd4 Rd2+ 19. Ke4 Kd6 20. Rf5 Kc6 21. Ke3 Rd6 22. Ne4
Re6 23. Kd4 Kb6 24. Rd5 Rc6 { Kc6 } 25. Nd2 { Nd6 } Ka6 26. Nc4 Rc5 27. Rd6+!
Kb5 28. Rb6+ Ka4 29. Kc3 Rxc4+ 30. Kxc4! Ka3 31. Rb5 Ka2 { Ka4 } 32. Kc3 Ka1
33. Kc2 Ka2 34. Ra5# 1-0
[FEN "6/4k1/3r2/6/R5/KN4 b"]
{
a b c d e f
+---+---+---+---+---+---+
6 | |///| |///| |///| 6
+---+---+---+---+---+---+
5 |///| |///| |/k/| | 5
+---+---+---+---+---+---+
4 | |///| |/r/| |///| 4
+---+---+---+---+---+---+
3 |///| |///| |///| | 3
+---+---+---+---+---+---+
2 | R |///| |///| |///| 2
+---+---+---+---+---+---+
1 |/K/| N |///| |///| | 1
+---+---+---+---+---+---+
a b c d e f
}
1. ... Rb4 2. Nd2 { Ra3 } Kd4 { Kd5 } 3. Ra3 Rb5 { Rb6, Kc5, Kd5 } 4. Rf3
{ Ka2 } Rb4 { Rb6 } 5. Nb3+ { Ka2 } Ke4 6. Rc3 Kd5 7. Kb2 Rc4 8. Rd3+ { Re3 }
Ke4 9. Rd1 Rc6 10. Nd4 Rc4 11. Nc2 Rc5 { Rc6, Ke5 } 12. Nb4 Rc4 { Rb5, Re5,
Rf5, Ke3 } 13. Kb3 Rc5 14. Na2 Rc6 { Kf5, Ke3, Ke5, Kf4 } 15. Nc3+ Kf3 { Ke3,
Ke5, Kf4 } 16. Rd3+ { Re1, Kc2 } Kf4 17. Kc2 Re6 18. Kd2 Ke5 { Kf5 } 19. Rd5+
Kf4 20. Rd4+ Ke5 21. Rb4 Rc6 { Ra6, Rf6 } 22. Kd3 Rc5 23. Ra4 Kf5 24. Ra1
{ Kd4 } Re5 { Ke6 } 25. Ne2 { Ra2, Kd4 } Rd5+ 26. Nd4+ Ke5 27. Re1+ Kd6 28.
Re6+ Kc5 29. Rc6+ Kb4 30. Rc4+ Ka3 31. Kc3 Ra5 32. Rc6 Ka4 33. Nb3 Rd5 34. Rb6
Rd1 { Re5 } 35. Rb4+ Ka3 36. Rb5 Rd3+ 37. Kxd3 Kb2 { Ka4 } 38. Nd2+ { Nd4+,
Nc5+, Rb4, Rb6, Kd2 } Ka3 39. Kc3 Ka4 40. Rc5 { Rd5, Re5, Rf5 } Ka3 41. Ra5#
1-0
In your example, with black to move, the game is lost with the rook *anywhere*
where it can't capture the white rook. With white to move, the black rook can
be anywhere and the game is won.
If the rook stays on d4, the only drawn spot for the black king with black to
move is b3, which presumably draws with 1. ... Ra4. Everywhere else is lost.
With black to move, the best spot for the king is actually c1, which is lost in
45 moves.
bruce
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