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

This Sudoku Puzzle has 66 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Pair, Hidden Rectangle, undefined, AIC 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 5 / Column 2 → 2 (Hidden Single)
  2. Row 6 / Column 8 → 3 (Hidden Single)
  3. Row 7 / Column 9 → 8 (Hidden Single)
  4. Row 5 / Column 7 → 9 (Hidden Single)
  5. Row 7 / Column 4 → 2 (Hidden Single)
  6. Row 2 / Column 9 → 9 (Hidden Single)
  7. Row 1 / Column 9 → 2 (Hidden Single)
  8. Row 2 / Column 7 → 6 (Naked Single)
  9. Row 2 / Column 1 → 1 (Naked Single)
  10. Row 2 / Column 3 → 3 (Naked Single)
  11. Row 2 / Column 5 → 2 (Full House)
  12. Row 8 / Column 7 → 2 (Hidden Single)
  13. Row 9 / Column 3 → 2 (Hidden Single)
  14. Row 9 / Column 8 → 6 (Hidden Single)
  15. Row 8 / Column 9 → 5 (Hidden Single)
  16. Row 6 / Column 3 → 9 (Hidden Single)
  17. Locked Candidates Type 1 (Pointing): 8 in b2 => r6c4<>8
  18. Locked Candidates Type 1 (Pointing): 1 in b3 => r5c8<>1
  19. Locked Candidates Type 2 (Claiming): 1 in r5 => r4c56,r6c45<>1
  20. Naked Pair: 4,7 in r7c18 => r7c26<>4, r7c2<>7
  21. Hidden Rectangle: 3/4 in r8c25,r9c25 => r8c2<>4
  22. XY-Chain: 1 1- r1c8 -4- r7c8 -7- r9c9 -4- r9c5 -3- r9c4 -5- r5c4 -1 => r1c4<>1
  23. AIC: 7 7- r5c8 =7= r5c5 =1= r8c5 -1- r7c6 -9- r7c2 =9= r9c2 =7= r9c9 -7 => r46c9,r7c8<>7
  24. Row 7 / Column 8 → 4 (Naked Single)
  25. Row 9 / Column 9 → 7 (Full House)
  26. Row 1 / Column 8 → 1 (Naked Single)
  27. Row 7 / Column 1 → 7 (Naked Single)
  28. Row 3 / Column 8 → 5 (Naked Single)
  29. Row 3 / Column 7 → 4 (Full House)
  30. Row 5 / Column 8 → 7 (Full House)
  31. Locked Candidates Type 2 (Claiming): 4 in r5 => r4c56,r6c5<>4
  32. Locked Candidates Type 2 (Claiming): 5 in r5 => r4c6,r6c4<>5
  33. Row 6 / Column 4 → 6 (Naked Single)
  34. Row 4 / Column 6 → 3 (Naked Single)
  35. Row 1 / Column 6 → 6 (Naked Single)
  36. Row 1 / Column 3 → 4 (Naked Single)
  37. Row 3 / Column 6 → 1 (Naked Single)
  38. Row 1 / Column 2 → 8 (Naked Single)
  39. Row 1 / Column 4 → 3 (Full House)
  40. Row 3 / Column 4 → 8 (Full House)
  41. Row 7 / Column 6 → 9 (Naked Single)
  42. Row 7 / Column 2 → 1 (Full House)
  43. Row 9 / Column 4 → 5 (Naked Single)
  44. Row 5 / Column 4 → 1 (Full House)
  45. Row 8 / Column 3 → 6 (Naked Single)
  46. Row 9 / Column 6 → 4 (Naked Single)
  47. Row 5 / Column 6 → 5 (Full House)
  48. Row 5 / Column 5 → 4 (Full House)
  49. Row 3 / Column 3 → 7 (Naked Single)
  50. Row 3 / Column 2 → 6 (Full House)
  51. Row 4 / Column 3 → 1 (Full House)
  52. Row 8 / Column 1 → 4 (Naked Single)
  53. Row 8 / Column 2 → 3 (Naked Single)
  54. Row 8 / Column 5 → 1 (Full House)
  55. Row 9 / Column 5 → 3 (Full House)
  56. Row 9 / Column 2 → 9 (Full House)
  57. Row 4 / Column 9 → 4 (Naked Single)
  58. Row 6 / Column 9 → 1 (Full House)
  59. Row 6 / Column 1 → 5 (Naked Single)
  60. Row 4 / Column 1 → 6 (Full House)
  61. Row 4 / Column 2 → 7 (Naked Single)
  62. Row 6 / Column 2 → 4 (Full House)
  63. Row 6 / Column 7 → 8 (Naked Single)
  64. Row 4 / Column 7 → 5 (Full House)
  65. Row 4 / Column 5 → 8 (Full House)
  66. Row 6 / Column 5 → 7 (Full House)
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