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| Vladimír Janál, Grigory Popov (após Karl Fabel, 1950), YouTube, 28/10/2008. Código FEN: 8/8/2N5/7p/4ppnr/4pkp1/1Kp1nprp/5bbq w - - 0 1. |
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In the diagram, the black knights are tied down to guarding against potential knight mates at d4 and e5, so the only piece that can move meaningfully is the rook. So the aim of this problem seems to be to maneuver the white king to capture the rook. Also, Black cannot move the h-pawn after moving the rook, because on his next move he would have to move one of the knights. But the white king must avoid making a move that enables a black knight check on a square other than d4 or e5. Also, since the most direct route to g5 has an odd number of moves, the white king needs to find a safe square for a tempo play. This is the sequence:
ResponderExcluir1 Kxc2 Rh3 2 Kb2 Rh4 3 Ka3 Rh3 4 Kb4 Rh4 5 Kc5 Rh3 6 Kd6 Rh4 7 Ke7 Rh3 8 Kf7 Rh4 (not 8 ... Sh6+? 9 Kg6 (threat 10 Se5 mate) Sg4 10 Kg5 Rh4 11 Kxh4 S any 12 Sd4 or Se5 mate) 9 Kf8! Rh3 10 Kg7 Rh4 11 Kg6 Rh3 12 Kg5 Rh4 13 Kxh4 S any 14 Sd4 or Se5
Note that if the king goes to f8 before f7 the plan falls apart:
Excluir8 Kf8? Rh4 9 Kf7 Sh6+! 10 Kg6 Rg4+ 11 Kxh6 Rg6+ 12 Kxg6 Kg4 13 Se5+ Kh3 and there's no mate in one.
Jake, I think we have to avoid f7 at all costs. In your line, after 1. Kxc2 Rh3 2. Kb2 Rh4 3. Ka3 Rh3 4. Kb4 Rh4 5. Kc5 Rh3 6. Kd6 Rh4 7. Ke7? Rh3 8. Kf7?, 8. ... Nh6+ 9. Kg6 Kg4! 10. Ne5+ Kh4 11. Kxh6 Nd4, and the Black King escapes the "cage"...
ExcluirI think I have it now.
ResponderExcluir1 Kxc2 Rh3 2 Kb2 Rh4 3 Ka3 Rh3 4 Kb4 Rh4 5 Kc5 Rh3 6 Kd6 Rh4 7 Ke7 Rh3 8 Kf8 Rh4 9 Kg7 Rh3 10 Kg6 Rh4 11 Kf5!
11 ... Rh3 12 Kg5 Rh4 13 Kxh4 S any 14 Sd4 or Se5
11 ... Sh6+ 12 Kg5 (threat 13 Se5 mate) Sf7+ 13 Kxh4 S any 14 Sd4 or Se5
If Black plays
In the second line Black could also play 12 ... Sg4 and the subsequent play doesn't change.
ExcluirNever mind. I found out why this sequence doesn't work.
ExcluirHere's the real solution:
ResponderExcluir1 Kxc2 Rh3 2 Kb2 Rh4 3 Ka3 Rh3 4 Kb4 Rh4 5 Kc5 Rh3 6 Kd6 Rh4 7 Ke6! Rh3 8 Ke7 Rh4 9 Kf8 Rh3 10 Kg7 Rh4 11 Kg6 Rh3 12 Kg5 Rh4 13 Kxh4 S any 14 Se5 or Sd4
That's it, Jake!!
ExcluirThe Black Knights cannot move, as mate would follow. So, Black has to keep moving his Rook...
1. Kxc2 Rh3 2. Kb2 Rh4 3. Ka3 Rh3 4. Kb4 Rh4 5. Kc5 Rh3 6. Kd6 Rh4 7. Ke6! Rh3 8. Ke7 Rh4 9. Kf8 Rh3 10. Kg7 Rh4 11. Kg6 Rh3 12. Kg5!
12. ... Rh4 13. Kxh4!
13. ... Nc1/Nc3/Nd4 14. N(x)d4#
13. ... Nh6/Nf6/Ne5 14. N(x)e5#
12. ... h4 13. Kg6!
13. ... Nc1/Nc3/Nd4 14. N(x)d4#
13. ... Nh6/Nf6/Ne5+ 14. N(x)e5#
Keywords: Minimal (White), Maximal (Black).
This is a World Record in chess composition - longest known mate of King and Knight against all.