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.

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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