# I'm interested in extremely difficult retros.....

David113
Posers and Puzzles 11 Jul '08 11:29
1. 11 Jul '08 11:29
Can somebody (SwissGambit? π) post some examples of difficult retros? but NOT PGs, please - I have enough of those.π

Thank youπ
2. 11 Jul '08 16:20
Hmm, I typed "difficult retro" on google. This was the first result:
I don't know how to set "illegal" positions in fen, so I will just write the pieces squares.

Pieces: Kc8, Kd6, Qc6, Rd8, Rf6, Ba8, Ne8, a7, b7

Colour the pieces. What was the last move?

I'm afraid it's too easy for you though, so I will look a bit further π
3. 11 Jul '08 16:421 edit
4. 11 Jul '08 16:50
Originally posted by heinzkat
[fen]B1KRN3/PP6/2QK1R2/8/8/8/8/8[/fen]
Actually, this retro is not difficult at all...π
5. 11 Jul '08 16:53
Ever tried your hand at SwissGambit's Illegal Cluster problem(s)?
6. 11 Jul '08 17:111 edit

white to move and draw.
7. 12 Jul '08 10:06
Hint: 50-move rule
8. 12 Jul '08 16:33
Originally posted by crazyblue

[fen]nB3RbN/1kppppq1/1p4p1/1P3p2/Bp3P1n/4PrbP/2PP1rP1/R3K3 w - - 0 1[/fen]

white to move and draw.
But in that one the idea is clear immediately (that white castles and thus proves that 50 moves were made without capture/pawn move).
9. SwissGambit
Caninus Interruptus
12 Jul '08 16:541 edit
Originally posted by David113
Can somebody (SwissGambit? π) post some examples of difficult retros? but NOT PGs, please - I have enough of those.π

Thank youπ

Release the position
10. 12 Jul '08 17:061 edit
That means, I suppose, pick as few as possible pieces off the board in order to make it legal?

edit: Googled it, I suppose you need to fix the diagram (2 Black Kings)
11. SwissGambit
Caninus Interruptus
12 Jul '08 17:27
Originally posted by heinzkat
That means, I suppose, pick as few as possible pieces off the board in order to make it legal?

edit: Googled it, I suppose you need to fix the diagram (2 Black Kings)
How did you find it given that the diagram was wrong?
12. 12 Jul '08 17:301 edit
"Release the position"

In essence, this stipulation asks you to find how a given (usually quite tangled) position can be reached legally. So that it really asks for a proof game but without insisting on giving all painful details of a proof game. You "only" have to find the tricky maneuver that is required to lock everything the way it appears in the diagram.
13. 12 Jul '08 18:31
Originally posted by SwissGambit
How did you find it given that the diagram was wrong?
I guess he googled "release the position", not the diagram, and found that in a "release the position" problem the position must be leagl so the 2 kings are a mistake.π
14. 12 Jul '08 19:05
Originally posted by David113
I guess he googled "release the position", not the diagram, and found that in a "release the position" problem the position must be leagl so the 2 kings are a mistake.π
Yes, that is what I did, sorry for being unclear.
15. 12 Jul '08 20:55
Originally posted by SwissGambit
[fen]Nrbb4/qprp3p/PpQK1p1P/RRpp4/Brk2P2/B1P5/1PP5/1N6 w[/fen]
Release the position
Thank you SwissGambitπ