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8 Queens Puzzle - Genetic Algorithms 2

This is the C# source code for part 2 of my series on genetic algorithms.

In this part we extend the solver we built in part 1 to solve a problem for which there are multiple correct answers - the 8 Queens Puzzle. This puzzle asks us to place 8 Chess Queens on a chess board such that none of them are under attack.

Sample output:

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. . . . Q . . .
Q Q . . . . Q . 
. . Q . . . . .
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generation          1 fitness   30008 elapsed: 00:00:00.1161487
. . . . Q Q Q . 
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Q Q . . . . . . 
. . Q . . . . Q
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generation          1 fitness   10014 elapsed: 00:00:00.1220378
. . Q . . . . .
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Q . . . . . . Q
Q . . Q . . . . 
. . Q . . . . .
. . . Q . . . . 
. . Q . . . . .
generation          1 fitness   20 elapsed: 00:00:00.1248852
. . . . Q . . Q
. . Q . . . . .
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. . . Q . . . . 
. . . . Q Q . . 
. . Q . . . . .
generation          1 fitness   14 elapsed: 00:00:00.1344589
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. . . Q Q . . .
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. . Q . . . . .
. Q . . . Q . . 
Q . . . . . . .
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generation          1 fitness   12 elapsed: 00:00:00.1451020
Q . . . Q . . .
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generation          1 fitness   10 elapsed: 00:00:00.1546707
Q . . . Q . . .
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generation          2 fitness    8 elapsed: 00:00:00.2066084
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generation          3 fitness    6 elapsed: 00:00:00.2303158
Q . . . . . . .
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. . . . . Q . Q 
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generation         21 fitness    4 elapsed: 00:00:00.7416604
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generation         99 fitness    2 elapsed: 00:00:02.7303553
. . . Q . . . . 
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Q . . . . . . .
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generation        316 fitness    0 elapsed: 00:00:06.9379407
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