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Subject: Re: 3x3 chessboard puzzle, for humans [OT]

Author: Roy Eassa

Date: 14:41:07 04/24/02

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On April 24, 2002 at 17:17:46, Hans van der Zijden wrote:

>On April 24, 2002 at 14:44:07, Roy Eassa wrote:
>
>>
>>You have a 3x3 chessboard as follows:
>>
>>White's king is on c2.
>>White has pawns on a2, a3, and b3.
>>White has a queen on c3.
>>White has a rook on c1.
>>White has bishops on b1 and b2.
>>Square a1 is empty.
>>
>>White makes consectutive moves with the goal of getting his king to a1 in as few
>>moves as possible, with the following constraints:
>>
>>1) White must NEVER move the king to b2.
>>2) No pawn or piece can leave the 3x3 chessboard (i.e., the pawns cannot move at
>>all).
>>
>>What's the shortest solution?
>>
>>
>>[Adapted from H.E. Dedeney 1922.]
>
>1.Ba1 2.Qb2 3.Kc3 4.Bc2 5.Rb1 6.Qc1 7.Bb2 8.Ra1 9.Bb1 10.Kc2 11.Bc3 12.Qb2
>13.Kc1 14.Bc2 15.Rb1 16.Qa1 17.Rb2 18.Bb1 19.Rc2 20.Bb2 21.Rc3 22.Bc2 23.Kb1
>24.Bc1 25.Qb2 26.Ka1
>
>No computer was used in finding this solution.
>
>Hans


Good job!  You found what looks to be the optimal solution.




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