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

This Sudoku Puzzle has 64 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), undefined, Locked Candidates Type 2 (Claiming), Naked Triple, Full House, Uniqueness Test 2 techniques.

Naked Single Explanation
Hidden Single Explanation
Locked Candidates Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 7 / Column 4 → 7 (Naked Single)
  2. Row 1 / Column 9 → 3 (Hidden Single)
  3. Row 9 / Column 5 → 8 (Hidden Single)
  4. Row 8 / Column 7 → 3 (Hidden Single)
  5. Row 1 / Column 5 → 9 (Hidden Single)
  6. Row 1 / Column 3 → 5 (Naked Single)
  7. Row 1 / Column 1 → 4 (Naked Single)
  8. Row 3 / Column 2 → 1 (Naked Single)
  9. Locked Candidates Type 1 (Pointing): 9 in b1 => r2c789<>9
  10. Locked Candidates Type 1 (Pointing): 6 in b2 => r4c4<>6
  11. Locked Candidates Type 1 (Pointing): 6 in b8 => r6c6<>6
  12. X-Wing: 2 r14 c48 => r3c8<>2
  13. W-Wing: 7/4 in r2c7,r5c6 connected by 4 in r2c4,r3c6 => r5c7<>7
  14. W-Wing: 4/2 in r3c6,r4c8 connected by 2 in r1c48 => r3c8<>4
  15. Row 3 / Column 8 → 9 (Naked Single)
  16. Row 5 / Column 7 → 9 (Hidden Single)
  17. Row 9 / Column 7 → 4 (Naked Single)
  18. Row 2 / Column 7 → 7 (Naked Single)
  19. Row 8 / Column 2 → 4 (Hidden Single)
  20. Locked Candidates Type 2 (Claiming): 9 in r7 => r8c13,r9c1<>9
  21. XY-Wing: 7/8/3 in r48c3,r7c2 => r5c2,r7c3<>3
  22. Row 7 / Column 2 → 3 (Hidden Single)
  23. Locked Candidates Type 2 (Claiming): 8 in c2 => r5c3,r6c1<>8
  24. Naked Triple: 4,5,8 in r5c248 => r5c6<>4
  25. Row 5 / Column 6 → 7 (Naked Single)
  26. Row 6 / Column 6 → 2 (Naked Single)
  27. Row 3 / Column 6 → 4 (Naked Single)
  28. Row 6 / Column 7 → 5 (Naked Single)
  29. Row 3 / Column 7 → 2 (Full House)
  30. Row 3 / Column 9 → 5 (Full House)
  31. Row 2 / Column 4 → 6 (Naked Single)
  32. Row 1 / Column 4 → 2 (Full House)
  33. Row 1 / Column 8 → 6 (Full House)
  34. Row 4 / Column 8 → 2 (Hidden Single)
  35. Uniqueness Test 2: 8/9 in r2c13,r7c13 => r7c8,r9c1<>1
  36. Row 7 / Column 8 → 8 (Naked Single)
  37. Row 5 / Column 8 → 4 (Naked Single)
  38. Row 2 / Column 8 → 1 (Full House)
  39. Row 2 / Column 9 → 4 (Full House)
  40. Row 8 / Column 9 → 9 (Naked Single)
  41. Row 9 / Column 9 → 1 (Full House)
  42. Row 4 / Column 9 → 7 (Naked Single)
  43. Row 6 / Column 9 → 8 (Full House)
  44. Row 5 / Column 4 → 5 (Naked Single)
  45. Row 4 / Column 4 → 4 (Full House)
  46. Row 8 / Column 6 → 6 (Naked Single)
  47. Row 9 / Column 6 → 9 (Full House)
  48. Row 4 / Column 3 → 3 (Naked Single)
  49. Row 6 / Column 2 → 6 (Naked Single)
  50. Row 5 / Column 2 → 8 (Naked Single)
  51. Row 9 / Column 2 → 5 (Full House)
  52. Row 9 / Column 1 → 6 (Full House)
  53. Row 4 / Column 5 → 6 (Naked Single)
  54. Row 4 / Column 1 → 5 (Full House)
  55. Row 5 / Column 3 → 1 (Naked Single)
  56. Row 5 / Column 5 → 3 (Full House)
  57. Row 6 / Column 5 → 1 (Full House)
  58. Row 6 / Column 1 → 7 (Full House)
  59. Row 7 / Column 3 → 9 (Naked Single)
  60. Row 7 / Column 1 → 1 (Full House)
  61. Row 8 / Column 1 → 8 (Naked Single)
  62. Row 2 / Column 1 → 9 (Full House)
  63. Row 2 / Column 3 → 8 (Full House)
  64. Row 8 / Column 3 → 7 (Full House)
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