perplexus.info :: Games : No colors known?

No colors known? (Posted on 2004-08-04)

A friend told me about a chess game he had seen. At certain moment, the only pieces on board were a Queen at h8, a Rook at g6, and the Kings at h6 and g8. He didn't remember what color was each piece, but it can be worked out... how?

      +---+---+---+---+---+---+---+---+
      |   |   |   |   |   |   | K | Q | 8
      +---+---+---+---+---+---+---+---+
      |   |   |   |   |   |   |   |   | 7
      +---+---+---+---+---+---+---+---+
      |   |   |   |   |   |   | R | K | 6
      +---+---+---+---+---+---+---+---+
      |   |   |   |   |   |   |   |   | 5
      +---+---+---+---+---+---+---+---+
      |   |   |   |   |   |   |   |   | 4
      +---+---+---+---+---+---+---+---+
      |   |   |   |   |   |   |   |   | 3
      +---+---+---+---+---+---+---+---+
      |   |   |   |   |   |   |   |   | 2
      +---+---+---+---+---+---+---+---+
      |   |   |   |   |   |   |   |   | 1
      +---+---+---+---+---+---+---+---+
        a   b   c   d   e   f   g   h

If the Rook had been at g7, what would have been the colors?

See The Solution Submitted by Federico Kereki

Rating: 3.1429 (7 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)

Puzzle Answer

Comment 17 of 17 |

Both Kings cannot be in check, so one is in double check by Rg6 and Qh8 -- the only possibility is that the last move was g7xh8=Q+, so Kh6, Qh8 and Rg6 are White, and Kg8 is Black.

In the second case, the only possibility is that the last move was h7-h8=Q+, with Kg8, Qh8 and Rg7 being White, and Kh6 Black.

Posted by K Sengupta on 2024-01-19 23:15:32

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