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

This Sudoku Puzzle has 70 steps and it is solved using Locked Candidates Type 1 (Pointing), Hidden Pair, Finned Swordfish, Continuous Nice Loop, Hidden Single, Naked Single, Hidden Triple, Full House techniques.

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

Solution Steps:

  1. Locked Candidates Type 1 (Pointing): 3 in b1 => r46c2<>3
  2. Locked Candidates Type 1 (Pointing): 7 in b1 => r79c3<>7
  3. Locked Candidates Type 1 (Pointing): 9 in b8 => r46c5<>9
  4. Hidden Pair: 4,5 in r8c2,r9c3 => r8c2<>2, r8c2,r9c3<>8, r9c3<>6, r9c3<>9
  5. Locked Candidates Type 1 (Pointing): 2 in b7 => r7c7<>2
  6. Locked Candidates Type 1 (Pointing): 6 in b7 => r45c1<>6
  7. Finned Swordfish: 5 r159 c359 fr1c7 => r2c9<>5
  8. Continuous Nice Loop: 3/5/6/7/9 6= r1c5 =2= r6c5 -2- r5c4 =2= r5c3 =6= r5c6 -6- r3c6 =6= r1c5 =2 => r1c5<>3, r1c5,r5c3<>5, r4c6<>6, r1c5<>7, r5c3<>9
  9. Row 5 / Column 9 → 5 (Hidden Single)
  10. Row 1 / Column 7 → 5 (Hidden Single)
  11. Locked Candidates Type 1 (Pointing): 3 in b6 => r79c7<>3
  12. Hidden Pair: 1,3 in r7c59 => r7c59<>7, r7c5<>9, r7c9<>8
  13. Row 9 / Column 5 → 9 (Hidden Single)
  14. Row 9 / Column 3 → 5 (Hidden Single)
  15. Row 8 / Column 2 → 4 (Naked Single)
  16. Row 4 / Column 2 → 5 (Hidden Single)
  17. Hidden Triple: 2,6,9 in r13c8,r3c7 => r1c8<>4, r13c8,r3c7<>7, r3c78<>8, r3c8<>1
  18. Row 8 / Column 8 → 1 (Hidden Single)
  19. Row 7 / Column 9 → 3 (Naked Single)
  20. Row 7 / Column 5 → 1 (Naked Single)
  21. Row 8 / Column 7 → 2 (Hidden Single)
  22. Row 9 / Column 4 → 3 (Hidden Single)
  23. Row 8 / Column 1 → 6 (Hidden Single)
  24. Row 1 / Column 2 → 3 (Hidden Single)
  25. Row 3 / Column 6 → 3 (Hidden Single)
  26. Row 8 / Column 4 → 8 (Hidden Single)
  27. Row 5 / Column 1 → 3 (Hidden Single)
  28. Row 5 / Column 6 → 6 (Hidden Single)
  29. Row 5 / Column 3 → 2 (Naked Single)
  30. Row 5 / Column 4 → 4 (Naked Single)
  31. Row 5 / Column 8 → 9 (Full House)
  32. Row 1 / Column 5 → 6 (Hidden Single)
  33. Row 1 / Column 8 → 2 (Naked Single)
  34. Row 1 / Column 4 → 7 (Naked Single)
  35. Row 3 / Column 8 → 6 (Naked Single)
  36. Row 1 / Column 9 → 4 (Naked Single)
  37. Row 1 / Column 3 → 9 (Full House)
  38. Row 2 / Column 5 → 5 (Naked Single)
  39. Row 4 / Column 4 → 1 (Naked Single)
  40. Row 3 / Column 4 → 2 (Full House)
  41. Row 2 / Column 6 → 1 (Full House)
  42. Row 3 / Column 7 → 9 (Naked Single)
  43. Row 3 / Column 2 → 8 (Naked Single)
  44. Row 7 / Column 3 → 8 (Naked Single)
  45. Row 8 / Column 5 → 7 (Naked Single)
  46. Row 8 / Column 6 → 5 (Full House)
  47. Row 3 / Column 3 → 7 (Naked Single)
  48. Row 2 / Column 3 → 4 (Full House)
  49. Row 3 / Column 9 → 1 (Full House)
  50. Row 6 / Column 2 → 9 (Naked Single)
  51. Row 7 / Column 2 → 2 (Full House)
  52. Row 4 / Column 3 → 6 (Naked Single)
  53. Row 6 / Column 3 → 1 (Full House)
  54. Row 4 / Column 1 → 8 (Full House)
  55. Row 7 / Column 7 → 7 (Naked Single)
  56. Row 7 / Column 1 → 9 (Full House)
  57. Row 9 / Column 1 → 7 (Full House)
  58. Row 4 / Column 5 → 3 (Naked Single)
  59. Row 6 / Column 5 → 2 (Full House)
  60. Row 6 / Column 6 → 7 (Naked Single)
  61. Row 4 / Column 6 → 9 (Full House)
  62. Row 2 / Column 7 → 8 (Naked Single)
  63. Row 2 / Column 9 → 7 (Full House)
  64. Row 9 / Column 9 → 8 (Full House)
  65. Row 4 / Column 7 → 4 (Naked Single)
  66. Row 4 / Column 8 → 7 (Full House)
  67. Row 6 / Column 8 → 8 (Naked Single)
  68. Row 6 / Column 7 → 3 (Full House)
  69. Row 9 / Column 8 → 4 (Full House)
  70. Row 9 / Column 7 → 6 (Full House)
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