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1.  Marinkatomb
wotagr8game
08 Sep '06 13:14
White to mate in one...

2. 08 Sep '06 13:17
Does this involve an en passant per chance?
3. 08 Sep '06 13:18
1.a5xb6 (en passant)#
4. 08 Sep '06 13:19
Originally posted by Marinkatomb
White to mate in one...

[fen]rb6/k1p4R/P1P5/PpK5/8/8/8/5B2 w - - 0 1[/fen]
haha! that actaully took me a while.

the awnser is _____________

yeah! work it out for youselves you lazy buggers!
5.  ivan2908
SelfProclaimedTitler
08 Sep '06 13:19
axb6++ Black can recapture because of pawn pinned to the king
6.  Marinkatomb
wotagr8game
08 Sep '06 13:21
It's sneaky ain't it.
7. 08 Sep '06 13:48
Interesting puzzle. As a minor aside, I'm thinking the position could never occur in an actual game.
8. 08 Sep '06 14:44
What do you mean by 'actual game'? The position can certainly be obtained via legal moves.

The posters so far forgot to mention/show the condition (proof is easy) for the solution: blacks last move MUST HAVE BEEN b7-b5.
9. 08 Sep '06 15:11
Originally posted by Mephisto2
What do you mean by 'actual game'? The position can certainly be obtained via legal moves.

The posters so far forgot to mention/show the condition (proof is easy) for the solution: blacks last move MUST HAVE BEEN b7-b5.
yes..... Via legal moves it is most certainly possible....

[Date "????.??.??"]
[Round "?"]
[White "White player"]
[Black "Black player"]
[Result "*"]
[WhiteElo "0"]
[BlackElo "0"]
[ECO "C20"]
[TimeControl "0"]

1. e4 e5 2. Qg4 Qg5 3. Qxg5 Nf6 4. Qxf6 d5 5. exd5 Be7 6. Qxg7 Kd8 7. Qxh8+
Kd7 8. Qxh7 Nc6 9. dxc6+ Kxc6 10. Qxf7 a5 11. b3 a4 12. bxa4 Bc5 13. f4 exf4
14. g3 fxg3 15. Bb2 gxh2 16. Bd4 Bxd4 17. Qd7+ Bxd7 18. Nc3 hxg1=Q 19. Rxg1
Bg4 20. Rxg4 Bxc3 21. Rg7 Bxa1 22. d4 Bxd4 23. Ke2 Ba7 24. Kd3 Bb8 25. Kd4
Kb6 26. a5+ Ka7 27. Bg2 Ka6 28. Kc5 Ka7 29. a4 Ka6 30. Kd5 Ka7 31. c4 Ka6 32.
c5 Ka7 33. c6 Ka6 34. Kc4 Ka7 35. a6 Kb6 36. Bf1 Ka7 37. Rh7 Kb6 38. a5+ Ka7
39. Kc5 b5 40. axb6# *
10.  Marinkatomb
wotagr8game
08 Sep '06 15:11 / 1 edit
Originally posted by Mephisto2
What do you mean by 'actual game'? The position can certainly be obtained via legal moves.

The posters so far forgot to mention/show the condition (proof is easy) for the solution: blacks last move MUST HAVE BEEN b7-b5.
I don't think you're correct there actually. Blacks black bishop would have had to move from f8-d6-b8, but it can't as there is a black pawn on c7....

Edit:ACtually i'm wrong, it could get to b8 via the a-file.
11. 08 Sep '06 15:13 / 2 edits
ignore.
12. 08 Sep '06 15:18
f8-c5-a7-b8
13. 08 Sep '06 15:40
bxb5 results ina stale'mate'
14. 08 Sep '06 15:43
Originally posted by Mephisto2
What do you mean by 'actual game'? The position can certainly be obtained via legal moves.
Sorry, I stand corrected. I missed the a5+, Ka7, Kc5 possibility.