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

This Sudoku Puzzle has 67 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), undefined, AIC, Continuous Nice Loop techniques.

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

Solution Steps:

  1. Row 6 / Column 3 → 8 (Naked Single)
  2. Row 4 / Column 3 → 5 (Naked Single)
  3. Row 2 / Column 3 → 7 (Naked Single)
  4. Row 4 / Column 1 → 9 (Naked Single)
  5. Row 9 / Column 3 → 3 (Naked Single)
  6. Row 8 / Column 3 → 4 (Full House)
  7. Row 4 / Column 2 → 2 (Naked Single)
  8. Row 6 / Column 1 → 1 (Naked Single)
  9. Row 5 / Column 2 → 7 (Full House)
  10. Row 7 / Column 6 → 4 (Hidden Single)
  11. Row 9 / Column 8 → 9 (Hidden Single)
  12. Row 3 / Column 9 → 7 (Hidden Single)
  13. Row 8 / Column 1 → 7 (Hidden Single)
  14. Row 8 / Column 4 → 3 (Hidden Single)
  15. Row 7 / Column 4 → 7 (Hidden Single)
  16. Row 9 / Column 4 → 5 (Hidden Single)
  17. Row 2 / Column 1 → 5 (Hidden Single)
  18. Locked Candidates Type 1 (Pointing): 2 in b9 => r8c5<>2
  19. Finned X-Wing: 2 c48 r35 fr6c4 => r5c6<>2
  20. Row 5 / Column 6 → 8 (Naked Single)
  21. Finned X-Wing: 6 c16 r39 fr1c6 fr2c6 => r3c4<>6
  22. AIC: 4 4- r4c5 -6- r6c4 =6= r1c4 =8= r1c2 =4= r3c2 =9= r3c4 -9- r2c5 =9= r6c5 =4= r6c7 -4 => r4c78,r6c5<>4
  23. Row 4 / Column 5 → 4 (Hidden Single)
  24. Row 6 / Column 7 → 4 (Hidden Single)
  25. Locked Candidates Type 1 (Pointing): 6 in b5 => r6c9<>6
  26. Continuous Nice Loop: 2/3/6/8/9 9= r3c2 =4= r3c8 =2= r5c8 -2- r5c4 -9- r3c4 =9= r3c2 =4 => r5c79<>2, r3c8<>3, r3c28<>6, r3c2<>8, r6c4<>9
  27. Row 3 / Column 6 → 3 (Hidden Single)
  28. Row 4 / Column 8 → 3 (Hidden Single)
  29. Row 2 / Column 9 → 3 (Hidden Single)
  30. W-Wing: 6/8 in r4c9,r8c5 connected by 8 in r48c7 => r8c9<>6
  31. XY-Chain: 6 6- r2c2 -9- r3c2 -4- r3c8 -2- r3c7 -6- r3c1 -8- r9c1 -6 => r3c1,r789c2<>6
  32. Row 3 / Column 1 → 8 (Naked Single)
  33. Row 9 / Column 1 → 6 (Full House)
  34. Row 3 / Column 7 → 6 (Hidden Single)
  35. Row 4 / Column 7 → 8 (Naked Single)
  36. Row 4 / Column 9 → 6 (Full House)
  37. Row 1 / Column 4 → 8 (Hidden Single)
  38. Row 7 / Column 8 → 6 (Hidden Single)
  39. Row 8 / Column 5 → 6 (Hidden Single)
  40. Row 6 / Column 4 → 6 (Hidden Single)
  41. W-Wing: 1/5 in r1c9,r5c7 connected by 5 in r15c8 => r2c7,r5c9<>1
  42. Row 2 / Column 7 → 2 (Naked Single)
  43. Row 3 / Column 8 → 4 (Naked Single)
  44. Row 8 / Column 7 → 5 (Naked Single)
  45. Row 5 / Column 7 → 1 (Full House)
  46. Row 1 / Column 8 → 5 (Naked Single)
  47. Row 1 / Column 9 → 1 (Full House)
  48. Row 5 / Column 8 → 2 (Full House)
  49. Row 3 / Column 2 → 9 (Naked Single)
  50. Row 3 / Column 4 → 2 (Full House)
  51. Row 5 / Column 4 → 9 (Full House)
  52. Row 5 / Column 9 → 5 (Full House)
  53. Row 6 / Column 9 → 9 (Full House)
  54. Row 6 / Column 5 → 2 (Full House)
  55. Row 7 / Column 9 → 8 (Naked Single)
  56. Row 8 / Column 9 → 2 (Full House)
  57. Row 8 / Column 2 → 8 (Full House)
  58. Row 1 / Column 6 → 6 (Naked Single)
  59. Row 1 / Column 2 → 4 (Full House)
  60. Row 2 / Column 2 → 6 (Full House)
  61. Row 7 / Column 5 → 1 (Naked Single)
  62. Row 7 / Column 2 → 5 (Full House)
  63. Row 9 / Column 2 → 1 (Full House)
  64. Row 2 / Column 6 → 1 (Naked Single)
  65. Row 2 / Column 5 → 9 (Full House)
  66. Row 9 / Column 5 → 8 (Full House)
  67. Row 9 / Column 6 → 2 (Full House)
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