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Your task is to set up a symmetrical (both vertically and horizontally) position on the first 7 ranks of a chess board that meet all of the criteria below.
For this puzzle, there is no eighth rank. It does not even exist.
That makes a chess board with 7 ranks x 8 files = 56 squares.
You have only...
If: 12 = 616 and 11 = 252 and 9 = 8 then 15 = ?
This question encloses a logic of association with a simple but trickily hidden explanation.
