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Post History
Simple strategy A greedy strategy works. Place X in squares 1, 2. (1, 2) excludes 3. Available: (4, 5, 6, 7, 8, 9, 10, 11, 12, 13). Place X in square 4. (1, 4) excludes 7. (2, 4) excludes 6....
#1: Initial revision
by
Peter Taylor
·
2026-08-24T08:54:26Z (24 days ago)
<details><summary>Simple strategy</summary> A greedy strategy works. * Place X in squares 1, 2. * (1, 2) excludes 3. Available: (4, 5, 6, 7, 8, 9, 10, 11, 12, 13). * Place X in square 4. * (1, 4) excludes 7. (2, 4) excludes 6. Available: (5, 8, 9, 10, 11, 12, 13). * Place X in square 5. * (1, 5) excludes 9. (2, 5) excludes 8. (4, 5) excludes 6. Available: (10, 11, 12, 13). * Place X in square 10. This generates no exclusions because squares 15, 16, 18, 19 don't exist. Available: (11, 12, 13). * Place X in square 11. (10, 11) excludes 12, but all other squares which would be excluded don't exist. Available: (13). * Place X in square 13. </details>