Go back
Construct your own retro #3

Construct your own retro #3

Posers and Puzzles

Vote Up
Vote Down

Find a position with 8 pieces or less, where no king is in check, it is not given who moved last, but it is still possible to conclude what was the exact position before the last ply and also what was the exact position before the last 2 plies.

Vote Up
Vote Down

Originally posted by David113
Find a position with 8 pieces or less, where no king is in check, it is not given who moved last, but it is still possible to conclude what was the exact position before the last ply and also what was the exact position before the last 2 plies.
In other words, you want a sound "Last 2 single moves?" problem.

Vote Up
Vote Down

Right

5 edits
Vote Up
Vote Down

Originally posted by David113
Find a position with 8 pieces or less, where no king is in check, it is not given who moved last, but it is still possible to conclude what was the exact position before the last ply and also what was the exact position before the last 2 plies.
Nevermind. I just realized my position doesn't work.

Vote Up
Vote Down

What about this?

Vote Up
Vote Down

Originally posted by LemonJello
What about this?

[fen]Kn1k4/Rppp4/p7/8/8/8/8/8 w[/fen]
The Black King could have just captured any piece (even R works, if K came from e7) on d8.

1 edit
Vote Up
Vote Down

Originally posted by BigDoggProblem
The Black King could have just captured any piece (even R works, if K came from e7) on d8.
Yep, you're right. I'm struggling with this problem.

3 edits
Vote Up
Vote Down

What about this?

Vote Up
Vote Down

Originally posted by LemonJello
What about this?

[fen]1rk5/Kpppp3/1p/8/8/8/8/8 w - - 0 1[/fen]
This has the same cook as my 7-unit attempt. It's possible that Black moved ...Kd8-c8 last, preceeded by Ka8-a7 and ...Rc8xb8+.

Vote Up
Vote Down

Originally posted by BigDoggProblem
This has the same cook as my 7-unit attempt. It's possible that Black moved ...Kd8-c8 last, preceeded by Ka8-a7 and ...Rc8xb8+.
Ugh. I guess I didn't learn much from that other thread. I'll have to think more about this problem later.

1 edit
Vote Up
Vote Down

*post deleted*