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| Pierre Gré, Échecs Français, 1981. Código FEN: k2b4/B7/K7/8/8/8/8/4R3 w - - 0 1. |
As Brancas jogam e dão xeque-mate em 4 lances!
(White to play and give checkmate in 4 moves!)
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| Pierre Gré, Échecs Français, 1981. Código FEN: k2b4/B7/K7/8/8/8/5R2/8 w - - 0 1. |
Mudei a posição da Torre... mas as Brancas ainda jogam e dão xeque-mate em 4 lances!
(I changed the Rook's position... but yet White to play and give checkmate in 4 moves!)
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| Pierre Gré, Échecs Français, 1981. Código FEN: k2b4/B7/K7/5R2/8/8/8/8 w - - 0 1. |
Empurrei a Torre... mas as Brancas ainda jogam e dão xeque-mate em 4 lances!
(I pushed the Rook... but yet White to play and give checkmate in 4 moves!)
PCFilho
So, originally a two-part twin but you made it a three-part.
ResponderExcluirFor part (a) the try 1 Rc1? (threat 2 Rc8 mate) is refuted by 1 Bc7!. 1 Re6! threatens 2 Rg6 which would put Black in zugzwang: any move allows 3 Rg8+ and mate at b8, d8, or f8. The only defense that doesn't allow 2 Re8+ and mate next move is 1 ... Be7, after which White has 2 Rc6! (threat 3 Rc8 mate) Bd6 3 Rc8+ Bb8 4 Rxb8.
Part (b) has the white rook starting on f2. Again, immediately moving the rook to the c-file fails: 1 Rc2? (threat 2 Rc8 mate) Bc7!. The key this time is 1 Rg2! which threatens 2 Rg6 or Rg7 with identical play to part (a)'s threat. Only one defense doesn't allow 2 Rg8+ and mate next move, namely 1 ... Bg5, after which White has 2 Rc2! (threat 3 Rc8 mate) Bf4 3 Rc8+ Bb8 4 Rxb8.
Part (c), the part you came up with, has the rook starting on f5. Again, 1 Rc5? (threat 2 Rc8 mate) dies to 1 ... Bc7!. The key is 1 Rh5! which puts Black in zugzwang. After 1 ... Bf6 (a random bishop move allows 2 Rh8+ and mate next move) White has 2 Rc5! (threat 3 Rc8 mate) Be5 3 Rc8+ Bb8 4 Rxb8.
The high degree of unity among the three parts (the unifying factors being that all three parts feature the Roman theme and that each part ends with the same ideal mate) is quite appealing.
Well done, Jake. I thought you would enjoy this post. :)
Excluir