Can you place the 6 'double dominoes' 1-1, 2-2, 3-3, 4-4, 5-5, 6-6 to form the border of a 4x4 square with equal sums for each of the four sides?
Solution to the Problem:
| 1 | 1 | 6 | 6 |
| 5 | 2 | ||
| 5 | 2 | ||
| 3 | 3 | 4 | 4 |
| or |
| 1 | 1 | 6 | 6 |
| 4 | 3 | ||
| 4 | 3 | ||
| 5 | 5 | 2 | 2 |
James Alarie and David & Judy Dixon sent in both solutions. Actually, David & Judy sent in all sixteen ways that it can be done -- you can rotate and reflect the two basic solutions to get the sixteen different configurations.
Mikael Holmquist sent in the following picture for his solution:
Correctly solved by:
| 1. Fede Baeza | Castellon, Spain |
| 2. Walt Arrison | Philadelphia, Pennsylvania |
| 3. Wajih Ansari | Harrisonburg, Virginia |
| 4. Chris Rogers | Winchester, Virginia |
| 5. Jason LaRusso | Winchester, Virginia |
| 6. Jeffrey Gaither | Winchester, Virginia |
| 7. David & Judy Dixon | Bennettsville, South Carolina |
| 8. William Funk | San Antonio, Texas |
| 9. John Funk | Ventura, California |
| 10. Tarpley Ashworth | Harrisonburg, Virginia |
| 11. Keith Mealy | Cincinnati, Ohio |
| 12. Tristan Collins | Winchester, Virginia |
| 13. Okechi Egekwu | Harrisonburg, Virginia |
| 14. Van Pham | Harrisonburg, Virginia |
| 15. Felix Morling | Tullängskolan, Örebro, Sweden |
| 16. Sara Christopher | Columbus, Georgia |
| 17. Jaime Garcia | Virginia Tech, Blacksburg, Virginia |
| 18. Crystal Church | Columbus, Georgia |
| 19. Justin Crabill | Harrisonburg, Virginia |
| 20. Clay Thomas | ---------- |
| 21.Samuel Coffin | Columbus, Georgia |
| 22. Kevin Jacobson | Columbus, Georgia |
| 23. Cameron Burkholder | Winchester, Virginia |
| 24. Daniel Surber | Winchester, Virginia |
| 25. Sheila Shah | Arlington, Virginia |
|
26. Ako Saleh, Bahadir Güngör & Jonathan Jansson Aldenfalk |
Tullängskolan, Örebro of Sweden |
| 27. James Alarie | University of Michigan -- Flint, Flint, Michigan |
| 28. Henry Woodward | Columbus, Georgia |
| 29. Maziar Vafadari | Columbus, Georgia |
| 30. Ben Swartz | Stephens City, Virginia |
| 31. Cathleen Meyerhoeffer | Harrisonburg, Virginia |
| 32. Jo Monhollen | Winchester, Virginia |
| 33. Cameron Saunders | Columbus, Georgia |
| 34. Blake Bowden | Columbus, Georgia |
| 35. Edie Ringger | Columbus, Georgia |
| 36. Irene Mathieu | Winchester, Virginia |
| 37. Viktor Logrell | Tullängsskolan, Örebro, Sweden |
| 38. Leslee Champion | Columbus, Georgia |
| 39. Mikael Holmquist | Tullängsskolan, Örebro, Sweden |
| 40. Nate Troup | Arlington, Virginia |
| 41. Libba Richardson | ---------- |
| 42. Laura Rickman | Columbus, Georgia |
| 43. Jackie Henson | Columbus, Georgia |
| 44. Simon Berentsen | Tullängsskolan, Örebro, Sweden |
| 45. Gustav Nilsson | Tullängsskolan, Örebro, Sweden |
| 46. Misty Carlisle | Winchester, Virginia |
| 47. Chris Hernley | Winchester, Virginia |
| 48. Daniel Gardiner | Winchester, Virginia |
| 49. Rob Adams | Winchester, Virginia |
| 50. John Todd | Harrisonburg, Virginia |
| 51. Arsalan Heydarian | Harrisonburg, Virginia |
| 52. Trey Mason | Winchester, Virginia |
| 53. Derick Gilkeson | Harrisonburg, Virginia |
| 54. Arin Smith | Winchester, Virginia |
| 55. Alex McIntire | Columbus, Georgia |
| 56. Heather Douglas | Harrisonburg, Virginia |
| 57. Dashiell Waugh-Quasebarth | Winchester, Virginia |