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

This Sudoku Puzzle has 74 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), undefined, Grouped AIC, Grouped Discontinuous Nice Loop, Discontinuous Nice Loop, Naked Triple, Locked Pair, AIC, Naked Single, Full House techniques.

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

Solution Steps:

  1. Row 1 / Column 5 → 2 (Hidden Single)
  2. Row 6 / Column 4 → 1 (Hidden Single)
  3. Row 9 / Column 1 → 1 (Hidden Single)
  4. Row 5 / Column 7 → 1 (Hidden Single)
  5. Row 7 / Column 4 → 2 (Hidden Single)
  6. Row 9 / Column 9 → 2 (Hidden Single)
  7. Row 2 / Column 5 → 1 (Hidden Single)
  8. Locked Candidates Type 1 (Pointing): 4 in b1 => r56c3<>4
  9. Row 5 / Column 5 → 4 (Hidden Single)
  10. Row 3 / Column 3 → 4 (Hidden Single)
  11. Row 1 / Column 6 → 4 (Hidden Single)
  12. Row 7 / Column 5 → 9 (Hidden Single)
  13. Row 8 / Column 2 → 9 (Hidden Single)
  14. Locked Candidates Type 1 (Pointing): 7 in b1 => r7c1<>7
  15. Locked Candidates Type 1 (Pointing): 3 in b2 => r2c128<>3
  16. Locked Candidates Type 1 (Pointing): 3 in b3 => r7c9<>3
  17. Locked Candidates Type 2 (Claiming): 3 in c2 => r7c13,r9c3<>3
  18. XYZ-Wing: 6/7/8 in r2c8,r3c57 => r3c9<>6
  19. Grouped AIC: 8 8- r7c9 -6- r7c123 =6= r9c23 -6- r9c5 -8- r8c46 =8= r8c7 -8 => r79c7<>8
  20. Grouped Discontinuous Nice Loop: 6 r3c1 -6- r3c5 =6= r2c46 -6- r2c8 -7- r2c1 =7= r3c1 => r3c1<>6
  21. Grouped AIC: 6 6- r3c7 =6= r3c5 =8= r9c5 -8- r8c46 =8= r8c7 -8- r7c9 -6 => r1c9,r789c7<>6
  22. Discontinuous Nice Loop: 6 r7c3 -6- r7c9 -8- r8c7 -7- r8c6 =7= r9c6 -7- r9c3 =7= r7c3 => r7c3<>6
  23. Discontinuous Nice Loop: 6 r7c8 -6- r7c9 -8- r8c7 -7- r8c6 =7= r9c6 =3= r9c2 -3- r7c2 =3= r7c8 => r7c8<>6
  24. Grouped Discontinuous Nice Loop: 6 r1c7 -6- r3c7 =6= r3c5 =8= r9c5 -8- r8c46 =8= r8c7 -8- r7c9 -6- r5c9 -9- r1c9 =9= r1c7 => r1c7<>6
  25. Locked Candidates Type 2 (Claiming): 6 in r1 => r2c12<>6
  26. Naked Triple: 3,8,9 in r1c79,r3c9 => r3c7<>8
  27. Grouped AIC: 6 6- r2c8 =6= r3c7 -6- r3c5 =6= r9c5 -6- r8c46 =6= r8c8 -6 => r46c8<>6
  28. Locked Pair: 2,4 in r46c8 => r4c7,r7c8<>4
  29. Row 7 / Column 7 → 4 (Hidden Single)
  30. Row 9 / Column 7 → 5 (Hidden Single)
  31. AIC: 6 6- r2c8 -7- r7c8 =7= r7c3 =5= r5c3 -5- r5c4 -6- r5c9 =6= r4c7 -6- r3c7 =6= r3c5 -6 => r2c46,r3c7<>6
  32. Row 3 / Column 7 → 7 (Naked Single)
  33. Row 2 / Column 8 → 6 (Naked Single)
  34. Row 8 / Column 7 → 8 (Naked Single)
  35. Row 1 / Column 7 → 9 (Naked Single)
  36. Row 4 / Column 7 → 6 (Full House)
  37. Row 7 / Column 9 → 6 (Naked Single)
  38. Row 5 / Column 9 → 9 (Naked Single)
  39. Row 3 / Column 5 → 6 (Hidden Single)
  40. Row 9 / Column 5 → 8 (Full House)
  41. Row 2 / Column 1 → 7 (Hidden Single)
  42. Row 2 / Column 2 → 5 (Hidden Single)
  43. Locked Candidates Type 1 (Pointing): 6 in b7 => r9c6<>6
  44. Naked Triple: 4,6,8 in r46c2,r6c3 => r46c1<>8, r5c13,r6c1<>6
  45. Row 5 / Column 4 → 6 (Hidden Single)
  46. Row 8 / Column 4 → 3 (Naked Single)
  47. Row 2 / Column 4 → 8 (Naked Single)
  48. Row 2 / Column 6 → 3 (Full House)
  49. Row 4 / Column 4 → 5 (Full House)
  50. Row 8 / Column 8 → 7 (Naked Single)
  51. Row 7 / Column 8 → 3 (Full House)
  52. Row 8 / Column 6 → 6 (Full House)
  53. Row 9 / Column 6 → 7 (Full House)
  54. Row 7 / Column 2 → 8 (Naked Single)
  55. Row 9 / Column 3 → 6 (Naked Single)
  56. Row 9 / Column 2 → 3 (Full House)
  57. Row 4 / Column 2 → 4 (Naked Single)
  58. Row 6 / Column 2 → 6 (Full House)
  59. Row 7 / Column 1 → 5 (Naked Single)
  60. Row 7 / Column 3 → 7 (Full House)
  61. Row 6 / Column 3 → 8 (Naked Single)
  62. Row 4 / Column 8 → 2 (Naked Single)
  63. Row 6 / Column 8 → 4 (Full House)
  64. Row 5 / Column 1 → 3 (Naked Single)
  65. Row 5 / Column 3 → 5 (Full House)
  66. Row 1 / Column 3 → 3 (Full House)
  67. Row 6 / Column 6 → 9 (Naked Single)
  68. Row 4 / Column 6 → 8 (Full House)
  69. Row 4 / Column 1 → 9 (Full House)
  70. Row 6 / Column 1 → 2 (Full House)
  71. Row 3 / Column 1 → 8 (Naked Single)
  72. Row 1 / Column 1 → 6 (Full House)
  73. Row 1 / Column 9 → 8 (Full House)
  74. Row 3 / Column 9 → 3 (Full House)
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