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

This Sudoku Puzzle has 71 steps and it is solved using Hidden Single, Naked Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Pair, Naked Triple, Full House, Empty Rectangle, undefined, Hidden Rectangle, Finned Swordfish 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 1 / Column 4 → 7 (Hidden Single)
  2. Row 1 / Column 3 → 5 (Hidden Single)
  3. Row 1 / Column 6 → 1 (Naked Single)
  4. Row 1 / Column 8 → 9 (Naked Single)
  5. Locked Candidates Type 1 (Pointing): 8 in b8 => r9c13<>8
  6. Locked Candidates Type 2 (Claiming): 2 in r1 => r2c123,r3c12<>2
  7. Naked Pair: 2,3 in r25c5 => r4689c5<>3, r6c5<>2
  8. Locked Candidates Type 1 (Pointing): 3 in b8 => r9c78<>3
  9. Naked Triple: 1,6,7 in r79c8,r8c9 => r8c78,r9c79<>7, r8c8,r9c9<>1, r8c8<>6
  10. Row 8 / Column 8 → 3 (Naked Single)
  11. Row 8 / Column 7 → 4 (Naked Single)
  12. Row 9 / Column 5 → 4 (Hidden Single)
  13. Row 1 / Column 1 → 4 (Hidden Single)
  14. Row 1 / Column 2 → 2 (Full House)
  15. Locked Candidates Type 2 (Claiming): 5 in c5 => r4c6,r6c4<>5
  16. Naked Triple: 1,5,6 in r7c46,r8c5 => r9c4<>1, r9c46<>5, r9c6<>6
  17. Locked Candidates Type 1 (Pointing): 5 in b8 => r7c7<>5
  18. Naked Triple: 1,5,6 in r7c468 => r7c23<>1, r7c23<>6
  19. Empty Rectangle: 3 in b1 (r25c5) => r5c2<>3
  20. XYZ-Wing: 2/3/8 in r5c45,r9c4 => r6c4<>3
  21. Hidden Rectangle: 4/9 in r5c23,r7c23 => r5c3<>9
  22. Finned Swordfish: 2 r357 c347 fr5c5 => r6c4<>2
  23. Row 6 / Column 4 → 1 (Naked Single)
  24. Row 7 / Column 4 → 5 (Naked Single)
  25. Row 7 / Column 6 → 6 (Naked Single)
  26. Row 7 / Column 8 → 1 (Naked Single)
  27. Row 8 / Column 5 → 1 (Naked Single)
  28. Row 3 / Column 8 → 8 (Naked Single)
  29. Row 8 / Column 9 → 7 (Naked Single)
  30. Row 3 / Column 7 → 2 (Naked Single)
  31. Row 5 / Column 8 → 7 (Naked Single)
  32. Row 9 / Column 8 → 6 (Full House)
  33. Row 2 / Column 7 → 7 (Naked Single)
  34. Row 2 / Column 9 → 1 (Full House)
  35. Row 3 / Column 4 → 3 (Naked Single)
  36. Row 7 / Column 7 → 9 (Naked Single)
  37. Row 2 / Column 5 → 2 (Naked Single)
  38. Row 3 / Column 6 → 5 (Full House)
  39. Row 9 / Column 4 → 8 (Naked Single)
  40. Row 5 / Column 4 → 2 (Full House)
  41. Row 9 / Column 6 → 3 (Full House)
  42. Row 7 / Column 2 → 4 (Naked Single)
  43. Row 7 / Column 3 → 2 (Full House)
  44. Row 9 / Column 7 → 5 (Naked Single)
  45. Row 9 / Column 9 → 2 (Full House)
  46. Row 5 / Column 5 → 3 (Naked Single)
  47. Row 5 / Column 2 → 9 (Naked Single)
  48. Row 6 / Column 7 → 3 (Naked Single)
  49. Row 4 / Column 7 → 8 (Full House)
  50. Row 5 / Column 3 → 4 (Naked Single)
  51. Row 5 / Column 6 → 8 (Full House)
  52. Row 4 / Column 6 → 9 (Full House)
  53. Row 2 / Column 2 → 3 (Naked Single)
  54. Row 6 / Column 3 → 6 (Naked Single)
  55. Row 4 / Column 9 → 5 (Naked Single)
  56. Row 6 / Column 9 → 9 (Full House)
  57. Row 6 / Column 1 → 2 (Naked Single)
  58. Row 6 / Column 5 → 5 (Full House)
  59. Row 4 / Column 5 → 6 (Full House)
  60. Row 8 / Column 3 → 8 (Naked Single)
  61. Row 8 / Column 1 → 6 (Full House)
  62. Row 2 / Column 3 → 9 (Naked Single)
  63. Row 2 / Column 1 → 8 (Full House)
  64. Row 3 / Column 1 → 1 (Naked Single)
  65. Row 3 / Column 2 → 6 (Full House)
  66. Row 9 / Column 3 → 1 (Naked Single)
  67. Row 4 / Column 3 → 3 (Full House)
  68. Row 4 / Column 1 → 7 (Naked Single)
  69. Row 4 / Column 2 → 1 (Full House)
  70. Row 9 / Column 2 → 7 (Full House)
  71. Row 9 / Column 1 → 9 (Full House)
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