Solution for Evil Sudoku #4176158432940

4
5
6
4
7
9
7
5
2
6
1
7
2
6
1
8
5
7
1
4
3
8
1
6
4
3

This Sudoku Puzzle has 61 steps and it is solved using Naked Single, Hidden Single, Full House, Locked Candidates Type 1 (Pointing), Naked Triple, Hidden Pair, Skyscraper, Uniqueness Test 1 techniques.

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Solution Steps:

  1. Row 2 / Column 4 → 3 (Naked Single)
  2. Row 3 / Column 4 → 2 (Naked Single)
  3. Row 1 / Column 5 → 5 (Hidden Single)
  4. Row 3 / Column 2 → 7 (Hidden Single)
  5. Row 3 / Column 7 → 4 (Hidden Single)
  6. Row 1 / Column 1 → 1 (Hidden Single)
  7. Row 8 / Column 5 → 4 (Hidden Single)
  8. Row 7 / Column 8 → 1 (Hidden Single)
  9. Row 2 / Column 8 → 9 (Naked Single)
  10. Row 1 / Column 9 → 8 (Naked Single)
  11. Row 1 / Column 7 → 3 (Naked Single)
  12. Row 3 / Column 9 → 1 (Full House)
  13. Row 3 / Column 6 → 8 (Naked Single)
  14. Row 2 / Column 5 → 1 (Full House)
  15. Row 3 / Column 3 → 3 (Full House)
  16. Row 8 / Column 6 → 5 (Hidden Single)
  17. Row 8 / Column 8 → 2 (Naked Single)
  18. Row 9 / Column 8 → 5 (Naked Single)
  19. Row 5 / Column 6 → 1 (Hidden Single)
  20. Row 9 / Column 1 → 3 (Hidden Single)
  21. Row 4 / Column 7 → 2 (Hidden Single)
  22. Row 1 / Column 2 → 2 (Hidden Single)
  23. Row 1 / Column 3 → 9 (Full House)
  24. Locked Candidates Type 1 (Pointing): 9 in b8 => r7c17<>9
  25. Row 8 / Column 2 → 9 (Hidden Single)
  26. Row 8 / Column 7 → 6 (Full House)
  27. Naked Triple: 2,6,8 in r279c3 => r5c3<>8, r6c3<>6
  28. Hidden Pair: 6,8 in r4c15 => r4c1<>9
  29. Row 6 / Column 1 → 9 (Hidden Single)
  30. Naked Triple: 4,5,7 in r6c349 => r6c5<>7
  31. Skyscraper: 7 in r6c9,r7c7 (connected by r67c4) => r5c7,r9c9<>7
  32. Row 5 / Column 7 → 9 (Naked Single)
  33. Row 9 / Column 9 → 9 (Naked Single)
  34. Row 4 / Column 9 → 5 (Naked Single)
  35. Row 6 / Column 9 → 7 (Full House)
  36. Uniqueness Test 1: 4/5 in r5c34,r6c34 => r5c4<>4, r5c4<>5
  37. Row 5 / Column 4 → 7 (Naked Single)
  38. Row 5 / Column 5 → 8 (Naked Single)
  39. Row 7 / Column 4 → 9 (Naked Single)
  40. Row 4 / Column 5 → 6 (Naked Single)
  41. Row 5 / Column 2 → 3 (Naked Single)
  42. Row 4 / Column 4 → 4 (Naked Single)
  43. Row 6 / Column 4 → 5 (Full House)
  44. Row 7 / Column 6 → 2 (Naked Single)
  45. Row 9 / Column 5 → 7 (Full House)
  46. Row 6 / Column 5 → 2 (Full House)
  47. Row 4 / Column 1 → 8 (Naked Single)
  48. Row 7 / Column 1 → 6 (Full House)
  49. Row 5 / Column 8 → 4 (Naked Single)
  50. Row 4 / Column 8 → 3 (Full House)
  51. Row 5 / Column 3 → 5 (Full House)
  52. Row 4 / Column 6 → 9 (Full House)
  53. Row 6 / Column 6 → 3 (Full House)
  54. Row 6 / Column 2 → 6 (Naked Single)
  55. Row 6 / Column 3 → 4 (Full House)
  56. Row 2 / Column 2 → 8 (Full House)
  57. Row 2 / Column 3 → 6 (Full House)
  58. Row 9 / Column 7 → 8 (Naked Single)
  59. Row 7 / Column 7 → 7 (Full House)
  60. Row 7 / Column 3 → 8 (Full House)
  61. Row 9 / Column 3 → 2 (Full House)
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