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Posers and Puzzles

Posers and Puzzles

  1. 13 May '08 06:32
    Black

    White
  2. Standard member SwissGambit
    Caninus Interruptus
    13 May '08 06:38 / 1 edit
    Originally posted by heinzkat
    Black
    [fen]8/8/3KPk2/8/8/8/8/B7[/fen]
    White
    Nope, not legal. [I suspect the diagram did not come out as intended.]
  3. 13 May '08 06:41
    Originally posted by SwissGambit
    Nope.
    SOLV'D (SwissGambit)
  4. 13 May '08 06:54
    Pointe of the PM by Jirakon
    Nope, not legal.
    SOLV'D (Jirakon). The answer is very complicated, as you can see...
  5. Standard member wolfgang59
    Infidel
    13 May '08 07:22
    Originally posted by SwissGambit
    Nope, not legal. [I suspect the diagram did not come out as intended.]
    The board is upside down and white has just promoted a pawn to a bishop. ... else its illegal.
  6. 13 May '08 07:26
    Originally posted by wolfgang59
    illegal.
    SOLV'D (wolfgang59)
  7. Standard member wolfgang59
    Infidel
    13 May '08 09:57
    Sorry I should have PMed you but didnt think I was right.
    (I NEVER SOLVE CHESS PROBLEMS!) LOL
  8. 13 May '08 18:01
    b) wK->d7. Why is this position not illegal anymore?
  9. 13 May '08 18:19
    Originally posted by heinzkat
    b) wK->d7. Why is this position not illegal anymore?
    I can't see a reason... maybe I'm just not good at this. Did you mean wKd5?
  10. 13 May '08 18:24
    Originally posted by heinzkat
    b) wK->d7. Why is this position not illegal anymore?
    e. p.
  11. 13 May '08 18:26
    Originally posted by David113
    e. p.
    Good one! Didn't consider that.
  12. 13 May '08 18:34
    Originally posted by David113
    e. p.
    Then why was e.p. not possible in the 'a)' part of the problem?
  13. 13 May '08 18:36 / 1 edit
    Originally posted by heinzkat
    Then why was e.p. not possible in the 'a)' part of the problem?
    bPe7 would put wKd6 in check (i.e. both kings would be in check simultaneously, bK from wBa1).
  14. 13 May '08 18:41
    Originally posted by curseknight
    bPe7 would put wKd6 in check.
    Yes... therefore the previous moves cannot have been d4-d5+, e7-e5, d5xe6 e.p.+, since White cannot have played d4-d5 while his own King was in check. Therefore, the first position is illegal.

    With the wK->d7 the previous moves can/must have been (in order to reach the position) d4-d5+, e7-e5. d4xe6 e.p.+.

    I welcome better thought out explanations.

    (on a sidenote, 'can have been', is there a better construction to say this?)
  15. 13 May '08 18:47 / 1 edit
    Originally posted by heinzkat
    Yes... therefore the previous moves cannot have been d4-d5+, e7-e5, d5xe6 e.p.+, since White cannot have played d4-d5 while his own King was in check. Therefore, the first position is illegal.

    With the wK->d7 the previous moves can/must have been (in order to reach the position) d4-d5+, e7-e5. d4xe6 e.p.+.

    I welcome better thought out explanations.

    (on a sidenote, 'can have been', is there a better construction to say this?)
    "were possibly" might be useful there. Good problem, at first I could not see how en passant was possible, forgetting the pawn check.