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

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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