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

This Sudoku Puzzle has 72 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Naked Pair, Locked Candidates Type 2 (Claiming), Hidden Pair, undefined, Discontinuous Nice Loop, AIC, Locked Pair, Full House 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 3 / Column 9 → 1 (Naked Single)
  2. Row 9 / Column 3 → 9 (Hidden Single)
  3. Row 2 / Column 1 → 9 (Hidden Single)
  4. Row 8 / Column 5 → 8 (Hidden Single)
  5. Row 9 / Column 8 → 4 (Hidden Single)
  6. Row 8 / Column 3 → 7 (Hidden Single)
  7. Row 2 / Column 5 → 6 (Hidden Single)
  8. Row 7 / Column 4 → 6 (Hidden Single)
  9. Row 1 / Column 2 → 4 (Hidden Single)
  10. Row 4 / Column 9 → 7 (Hidden Single)
  11. Row 7 / Column 7 → 7 (Hidden Single)
  12. Row 5 / Column 5 → 7 (Hidden Single)
  13. Locked Candidates Type 1 (Pointing): 9 in b3 => r56c8<>9
  14. Locked Candidates Type 1 (Pointing): 2 in b5 => r123c4<>2
  15. Locked Candidates Type 1 (Pointing): 5 in b5 => r23c4<>5
  16. Locked Candidates Type 1 (Pointing): 3 in b7 => r5c2<>3
  17. Naked Pair: 1,3 in r4c57 => r4c1348<>1, r4c348<>3
  18. Row 6 / Column 3 → 3 (Hidden Single)
  19. Locked Candidates Type 2 (Claiming): 1 in c3 => r2c2<>1
  20. Hidden Pair: 2,5 in r46c4 => r46c4<>8, r6c4<>1, r6c4<>9
  21. Row 6 / Column 8 → 8 (Hidden Single)
  22. Row 4 / Column 3 → 8 (Hidden Single)
  23. Row 2 / Column 2 → 8 (Hidden Single)
  24. Row 3 / Column 3 → 6 (Hidden Single)
  25. Row 2 / Column 6 → 5 (Hidden Single)
  26. Row 3 / Column 2 → 5 (Hidden Single)
  27. Locked Candidates Type 1 (Pointing): 2 in b4 => r8c1<>2
  28. XYZ-Wing: 1/3/6 in r4c7,r5c28 => r5c7<>1
  29. Discontinuous Nice Loop: 3 r8c2 -3- r8c9 -5- r8c8 =5= r4c8 =6= r4c1 -6- r8c1 =6= r8c2 => r8c2<>3
  30. Locked Candidates Type 2 (Claiming): 3 in r8 => r7c8<>3
  31. AIC: 1 1- r4c7 -3- r4c5 =3= r1c5 -3- r2c4 -1- r2c3 -2- r2c7 =2= r8c7 -2- r7c8 -1 => r5c8,r8c7<>1
  32. XY-Chain: 3 3- r2c9 -4- r6c9 -5- r4c8 -6- r5c8 -3 => r1c8<>3
  33. Locked Pair: 2,9 in r13c8 => r2c7,r78c8<>2
  34. Row 7 / Column 8 → 1 (Naked Single)
  35. Row 7 / Column 6 → 3 (Naked Single)
  36. Row 7 / Column 2 → 2 (Full House)
  37. Row 8 / Column 7 → 2 (Hidden Single)
  38. Row 2 / Column 3 → 2 (Hidden Single)
  39. Row 1 / Column 3 → 1 (Full House)
  40. Row 9 / Column 2 → 3 (Hidden Single)
  41. Row 2 / Column 4 → 1 (Hidden Single)
  42. Row 9 / Column 4 → 7 (Naked Single)
  43. Row 9 / Column 6 → 1 (Full House)
  44. Row 3 / Column 4 → 9 (Naked Single)
  45. Row 5 / Column 6 → 8 (Naked Single)
  46. Row 1 / Column 5 → 3 (Naked Single)
  47. Row 3 / Column 8 → 2 (Naked Single)
  48. Row 3 / Column 6 → 7 (Full House)
  49. Row 1 / Column 6 → 2 (Full House)
  50. Row 1 / Column 4 → 8 (Full House)
  51. Row 1 / Column 8 → 9 (Full House)
  52. Row 5 / Column 4 → 3 (Naked Single)
  53. Row 4 / Column 5 → 1 (Naked Single)
  54. Row 6 / Column 5 → 9 (Full House)
  55. Row 5 / Column 8 → 6 (Naked Single)
  56. Row 4 / Column 7 → 3 (Naked Single)
  57. Row 4 / Column 8 → 5 (Naked Single)
  58. Row 8 / Column 8 → 3 (Full House)
  59. Row 8 / Column 9 → 5 (Full House)
  60. Row 5 / Column 2 → 1 (Naked Single)
  61. Row 8 / Column 2 → 6 (Full House)
  62. Row 8 / Column 1 → 1 (Full House)
  63. Row 2 / Column 7 → 4 (Naked Single)
  64. Row 2 / Column 9 → 3 (Full House)
  65. Row 6 / Column 9 → 4 (Full House)
  66. Row 4 / Column 4 → 2 (Naked Single)
  67. Row 4 / Column 1 → 6 (Full House)
  68. Row 6 / Column 4 → 5 (Full House)
  69. Row 5 / Column 1 → 4 (Naked Single)
  70. Row 5 / Column 7 → 9 (Full House)
  71. Row 6 / Column 7 → 1 (Full House)
  72. Row 6 / Column 1 → 2 (Full House)
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