Please turn on javascript in your browser to play chess.
Posers and Puzzles

Posers and Puzzles

  1. 11 Jul '08 11:29
    Can somebody (SwissGambit? ) post some examples of difficult retros? but NOT PGs, please - I have enough of those.

    Thank you
  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
  3. 11 Jul '08 16:42 / 1 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...
  5. 11 Jul '08 16:53
    Ever tried your hand at SwissGambit's Illegal Cluster problem(s)?
  6. 11 Jul '08 17:11 / 1 edit
    how about this (unless you know it already, it will probably keep you busy for a while ):



    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
    how about this (unless you know it already, it will probably keep you busy for a while ):

    [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. Standard member SwissGambit
    Caninus Interruptus
    12 Jul '08 16:54 / 1 edit
    Originally posted by David113
    Can somebody (SwissGambit? ) post some examples of difficult retros? but NOT PGs, please - I have enough of those.

    Thank you

    Release the position
  10. 12 Jul '08 17:06 / 1 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. Standard member 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 17:30 / 1 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.
  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.
    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 SwissGambit