Posers and Puzzles

Posers and Puzzles

  1. Joined
    01 May '05
    Moves
    390
    18 Sep '05 00:44
    There is one promoted piece for each side in this position. Which pieces are the promoted ones?

  2. SubscriberBigDoggProblem
    Just...the Dogg
    bigdogghouse.com/RHP
    Joined
    26 Nov '04
    Moves
    123662
    18 Sep '05 01:572 edits
    Originally posted by fetofs
    There is one promoted piece for each side in this position. Which pieces are the promoted ones?

    [fen]rn3bN1/1ppp2pB/4k1Np/8/5B2/Kp1RP1P1/3PP2P/8[/fen]
    The last moves were:

    0...a4xb3ep -1.b2-b4 Kd6xPe6 -2.d5xe6ep e7-e5 -3.Bg5-f4.



    wBg5 is a promoted piece, because the original died on c1.

    However, there is no need for a second promoted piece to be present in the diagram. Black's a-pawn could capture wQ and wR, letting wPa through to a7. Pa7xQb8 produces the Bf4. f2xNe3 opens the f-file and Pf7 promotes and goes to d5 for c4xd5. Thus, it can't be proven that there is a second promoted piece on the board and the problem is cooked.
  3. Joined
    01 May '05
    Moves
    390
    18 Sep '05 02:001 edit
    Originally posted by BigDoggProblem

    However, there is no need for a second promoted piece to be present in the diagram. Thus, it can't be proven that there is a second promoted piece on the board and the problem is cooked.
    But does it need to be proven or needed?
  4. SubscriberBigDoggProblem
    Just...the Dogg
    bigdogghouse.com/RHP
    Joined
    26 Nov '04
    Moves
    123662
    18 Sep '05 03:53
    Originally posted by fetofs
    But does it need to be proven or needed?
    Absolutely.

    There should be no solution possible other than the composer's intended solution.

    In this case, why even bother talking about which pieces are promoted? Only Bf4 was for sure. A better stipulation would be, "Is the position legal?". This would force the solver to find the two e.p. captures, which seems to be the main point of the problem.
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