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This is not a very elegant or concise or even efficient solution. I tried
finding the weirdest solution I could think of. The idea is to reduce (or in
this case, enlarge :) the problem to the exact-cover problem. So I
formalized 6 constraints that need to be satisfied by a solution:

1) all the pieces need to be placed
2) all the columns need to be occupied
3) the left rook must appear to the left of the king and the right rook to
the right
4) the left bishop must appear to the left of the right one
5) the left knight must appear to the left of the right knight
6) each color must be occupied by exactly one bishop

The program constructs rows of a DLX matrix (if you don't know this
algorithm, it's described here: http://en.wikipedia.org/wiki/Dancing_Links).
It then uses a DLX solver that I wrote to find legal combinations of piece
placements. The enumeration order is not the same as the one on the internet
but is deterministic.

The file 'dlx.rb' contains the DLX solver.

Mushfeq.

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This is not a very elegant or concise or even efficient solution. I tried finding the weirdest solution I could think of. The idea is to reduce (or in this case, enlarge :) the problem to the exact-cover problem. So I formalized 6 constraints that need to be satisfied by a solution:
<br><br>1) all the pieces need to be placed<br>2) all the columns need to be occupied<br>3) the left rook must appear to the left of the king and the right rook to the right<br>4) the left bishop must appear to the left of the right one
<br>5) the left knight must appear to the left of the right knight<br>6) each color must be occupied by exactly one bishop<br><br>The program constructs rows of a DLX matrix (if you don't know this algorithm, it's described here: 
<a hrefttp://en.wikipedia.org/wiki/Dancing_Links">http://en.wikipedia.org/wiki/Dancing_Links</a>). It then uses a DLX solver that I wrote to find legal combinations of piece placements. The enumeration order is not the same as the one on the internet but is deterministic.
<br><br>The file 'dlx.rb' contains the DLX solver. <br><br>Mushfeq.<br><br>

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