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Interesting Problem...

From: Ajay Askoolum, 22nd July 1997

Vector 14:2, page 16

competitions and puzzles

Transcribed from the printed issue; not yet reviewed. Read it in the PDF of the issue, page 16

Given a chess board (8×8 cells), place exactly 16 dots, one in any given cell such that:

  1. each row
  2. each column
  3. each diagonal

is either empty or has exactly 2 dots in it.

This can be judged by APL solution + execution time. (The solution is not unique … but how many solutions are there?)

[An available solution has 3 lines & executes in 0.5 seconds on a 33Mhz 486]