# Construct your own retro #4

David113
Posers and Puzzles 13 Nov '06 23:53
1. 13 Nov '06 23:53
Find a position with 4 pieces, where it is possible to conclude what were the last 3 plies. In your solution a king may be in check; if no king is in check you are allowed to specify who moved last.
2. BigDoggProblem
14 Nov '06 00:34
Originally posted by David113
Find a position with 4 pieces, where it is possible to conclude what were the last 3 plies. In your solution a king may be in check; if no king is in check you are allowed to specify who moved last.
3. 14 Nov '06 00:54
fxe6 en passant, preceded by e5, preceded by a1B right?
4. BigDoggProblem
14 Nov '06 00:55
Originally posted by Ian68
fxe6 en passant, preceded by e5, preceded by a1B right?
White's pawns are moving up the board, so a1B is impossible.
5. 14 Nov '06 01:04
Originally posted by BigDoggProblem
White's pawns are moving up the board, so a1B is impossible.
Oh yes, so how did the bishop get there?
6. BigDoggProblem
14 Nov '06 02:38
Originally posted by Ian68
Oh yes, so how did the bishop get there?
A bishop stuck in the corner like that can only give check via discovery, of course.
7. 14 Nov '06 04:21
Originally posted by BigDoggProblem
A bishop stuck in the corner like that can only give check via discovery, of course.
fxe6 en passant removes a pawn from e5 which is a discovered check, but the pawn was moved e7-e5 the previous move to block check from the bishop. The bishop can only have moved on the a1-h8 diagonal so with the black pawn still on e7 black's king would have been in check before and after white's previous move.

Don't you need to move everything across 1 square: bishop on b1, pawn on f6 and king on g6?
8. BigDoggProblem
14 Nov '06 05:02
Originally posted by Ian68
fxe6 en passant removes a pawn from e5 which is a discovered check, but the pawn was moved e7-e5 the previous move to block check from the bishop. The bishop can only have moved on the a1-h8 diagonal so with the black pawn still on e7 black's king would have been in check before and after white's previous move.

Don't you need to move everything across 1 square: bishop on b1, pawn on f6 and king on g6?
Is -1.fxe6 the only possible en passant capture?

Moving the pieces one square to the right gives several possible last moves. Ba2 could have captured almost any piece on b1, giving check.
9. BigDoggProblem
17 Nov '06 21:32
The last moves in my solution were -1.dxe6ep e7-e5 -2.d4-d5+. I'm surprised no one got this.
10. 17 Nov '06 22:26
Originally posted by BigDoggProblem
The last moves in my solution were -1.dxe6ep e7-e5 -2.d4-d5+. I'm surprised no one got this.
well you posted the correct position right away. not much there to add then ðŸ˜‰

i knew this one from a book. white king is on d7 and author is N. Hoeg, Skakbladet 1916 ðŸ™‚
11. BigDoggProblem