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.

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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