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

This Sudoku Puzzle has 78 steps and it is solved using Naked Single, Hidden Single, Locked Pair, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Swordfish, Hidden Pair, undefined, AIC, Full House, Naked Pair, Uniqueness Test 1 techniques.

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

Solution Steps:

  1. Row 6 / Column 2 → 9 (Naked Single)
  2. Row 4 / Column 2 → 8 (Naked Single)
  3. Row 1 / Column 8 → 8 (Hidden Single)
  4. Row 3 / Column 7 → 7 (Hidden Single)
  5. Row 3 / Column 4 → 5 (Naked Single)
  6. Row 7 / Column 4 → 8 (Hidden Single)
  7. Row 5 / Column 6 → 8 (Hidden Single)
  8. Row 4 / Column 6 → 9 (Hidden Single)
  9. Row 7 / Column 8 → 9 (Hidden Single)
  10. Row 5 / Column 7 → 9 (Hidden Single)
  11. Locked Pair: 5,7 in r5c13 => r46c3,r5c59<>5, r5c5,r6c3<>7
  12. Locked Candidates Type 1 (Pointing): 4 in b4 => r123c3<>4
  13. Locked Candidates Type 1 (Pointing): 6 in b4 => r79c3<>6
  14. Locked Candidates Type 1 (Pointing): 7 in b7 => r7c56<>7
  15. Locked Candidates Type 1 (Pointing): 2 in b8 => r46c5<>2
  16. Locked Candidates Type 2 (Claiming): 6 in r8 => r7c56,r9c56<>6
  17. Locked Candidates Type 2 (Claiming): 1 in c7 => r79c9,r8c8<>1
  18. Locked Candidates Type 2 (Claiming): 2 in c8 => r4c7,r6c9<>2
  19. Naked Triple: 2,4,5 in r1c179 => r1c3<>5, r1c5<>4
  20. Swordfish: 1 c248 r268 => r2c3,r6c59,r8c57<>1
  21. Hidden Pair: 1,2 in r6c48 => r6c4<>6, r6c4<>7, r6c8<>4, r6c8<>5
  22. W-Wing: 3/1 in r5c5,r8c2 connected by 1 in r68c4 => r8c5<>3
  23. Finned X-Wing: 3 c26 r28 fr7c6 fr9c6 => r8c4<>3
  24. AIC: 5 5- r7c6 -3- r9c6 -4- r2c6 =4= r2c8 -4- r8c8 -5 => r7c79,r8c56<>5
  25. AIC: 3 3- r8c2 -1- r2c2 =1= r2c8 =4= r2c6 -4- r9c6 -3 => r8c6,r9c3<>3
  26. AIC: 1 1- r5c5 -3- r5c9 =3= r4c7 -3- r8c7 =3= r8c2 =1= r8c4 -1 => r6c4,r79c5<>1
  27. Row 6 / Column 4 → 2 (Naked Single)
  28. Row 6 / Column 8 → 1 (Naked Single)
  29. Row 5 / Column 9 → 3 (Naked Single)
  30. Row 5 / Column 5 → 1 (Naked Single)
  31. Row 8 / Column 4 → 1 (Hidden Single)
  32. Row 8 / Column 2 → 3 (Naked Single)
  33. Row 2 / Column 2 → 1 (Full House)
  34. Row 4 / Column 8 → 2 (Hidden Single)
  35. Row 3 / Column 9 → 1 (Hidden Single)
  36. Row 2 / Column 4 → 7 (Hidden Single)
  37. Locked Pair: 4,5 in r8c78 => r8c56,r9c79<>4
  38. Locked Pair: 2,6 in r79c9 => r1c9,r79c7<>2
  39. Row 1 / Column 7 → 2 (Hidden Single)
  40. Naked Pair: 3,4 in r29c6 => r7c6<>3
  41. Row 7 / Column 6 → 5 (Naked Single)
  42. Uniqueness Test 1: 6/7 in r6c56,r8c56 => r6c5<>6, r6c5<>7
  43. Row 6 / Column 5 → 5 (Naked Single)
  44. Row 6 / Column 9 → 4 (Naked Single)
  45. Row 4 / Column 7 → 5 (Full House)
  46. Row 1 / Column 9 → 5 (Naked Single)
  47. Row 2 / Column 8 → 4 (Full House)
  48. Row 8 / Column 8 → 5 (Full House)
  49. Row 6 / Column 3 → 6 (Naked Single)
  50. Row 6 / Column 6 → 7 (Full House)
  51. Row 8 / Column 7 → 4 (Naked Single)
  52. Row 1 / Column 1 → 4 (Naked Single)
  53. Row 2 / Column 6 → 3 (Naked Single)
  54. Row 2 / Column 3 → 5 (Full House)
  55. Row 4 / Column 3 → 4 (Naked Single)
  56. Row 8 / Column 6 → 6 (Naked Single)
  57. Row 9 / Column 6 → 4 (Full House)
  58. Row 8 / Column 5 → 7 (Full House)
  59. Row 3 / Column 1 → 8 (Naked Single)
  60. Row 1 / Column 4 → 6 (Naked Single)
  61. Row 4 / Column 4 → 3 (Full House)
  62. Row 4 / Column 5 → 6 (Full House)
  63. Row 5 / Column 3 → 7 (Naked Single)
  64. Row 5 / Column 1 → 5 (Full House)
  65. Row 3 / Column 3 → 9 (Naked Single)
  66. Row 1 / Column 3 → 3 (Full House)
  67. Row 1 / Column 5 → 9 (Full House)
  68. Row 3 / Column 5 → 4 (Full House)
  69. Row 9 / Column 1 → 6 (Naked Single)
  70. Row 7 / Column 1 → 7 (Full House)
  71. Row 7 / Column 3 → 1 (Naked Single)
  72. Row 9 / Column 3 → 8 (Full House)
  73. Row 9 / Column 9 → 2 (Naked Single)
  74. Row 7 / Column 9 → 6 (Full House)
  75. Row 7 / Column 7 → 3 (Naked Single)
  76. Row 7 / Column 5 → 2 (Full House)
  77. Row 9 / Column 5 → 3 (Full House)
  78. Row 9 / Column 7 → 1 (Full House)
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