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

This Sudoku Puzzle has 81 steps and it is solved using Hidden Single, Locked Pair, Naked Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), undefined, Grouped Discontinuous Nice Loop, Discontinuous Nice Loop, Empty Rectangle, Grouped AIC, Naked Pair, Hidden Triple, Continuous Nice Loop, 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 3 / Column 5 → 4 (Hidden Single)
  2. Row 1 / Column 6 → 6 (Hidden Single)
  3. Row 6 / Column 3 → 4 (Hidden Single)
  4. Row 4 / Column 9 → 4 (Hidden Single)
  5. Row 8 / Column 6 → 4 (Hidden Single)
  6. Row 9 / Column 1 → 4 (Hidden Single)
  7. Row 7 / Column 6 → 2 (Hidden Single)
  8. Row 4 / Column 6 → 5 (Hidden Single)
  9. Locked Pair: 3,5 in r8c45 => r79c5,r8c178<>3, r79c5,r8c278<>5
  10. Row 1 / Column 8 → 5 (Hidden Single)
  11. Row 8 / Column 5 → 5 (Hidden Single)
  12. Row 8 / Column 4 → 3 (Naked Single)
  13. Row 3 / Column 4 → 5 (Hidden Single)
  14. Locked Candidates Type 1 (Pointing): 8 in b8 => r5c5<>8
  15. Locked Candidates Type 1 (Pointing): 9 in b8 => r125c5<>9
  16. Locked Candidates Type 1 (Pointing): 9 in b2 => r2c28<>9
  17. Locked Candidates Type 1 (Pointing): 9 in b1 => r45c1<>9
  18. Locked Candidates Type 2 (Claiming): 9 in c8 => r456c7,r5c9<>9
  19. Locked Candidates Type 2 (Claiming): 7 in c9 => r13c7,r2c8<>7
  20. Finned X-Wing: 3 c68 r26 fr4c8 fr5c8 => r6c7<>3
  21. Grouped Discontinuous Nice Loop: 2 r3c3 -2- r2c23 =2= r2c8 -2- r8c8 -7- r8c7 =7= r4c7 =6= r5c7 -6- r5c3 =6= r3c3 => r3c3<>2
  22. Grouped Discontinuous Nice Loop: 6 r4c1 -6- r8c1 =6= r8c2 =1= r2c2 -1- r2c4 =1= r6c4 -1- r5c5 -3- r5c13 =3= r4c1 => r4c1<>6
  23. Discontinuous Nice Loop: 2 r8c1 -2- r8c8 -7- r8c7 =7= r4c7 =6= r4c2 -6- r8c2 =6= r8c1 => r8c1<>2
  24. Empty Rectangle: 2 in b3 (r35c1) => r5c8<>2
  25. Discontinuous Nice Loop: 3 r5c1 -3- r5c5 -1- r1c5 =1= r1c1 =9= r3c1 =2= r5c1 => r5c1<>3
  26. Grouped AIC: 2/6 2- r5c1 =2= r3c1 -2- r2c23 =2= r2c8 -2- r8c8 -7- r8c7 =7= r4c7 =6= r5c7 -6 => r5c7<>2, r5c1<>6
  27. Almost Locked Set XZ-Rule: A=r4c1 {38}, B=r5c159 {1238}, X=8, Z=3 => r5c3<>3
  28. Row 4 / Column 1 → 3 (Hidden Single)
  29. Discontinuous Nice Loop: 2 r5c9 -2- r5c1 -8- r7c1 -1- r7c9 =1= r5c9 => r5c9<>2
  30. Locked Candidates Type 1 (Pointing): 2 in b6 => r6c2<>2
  31. Naked Pair: 1,3 in r5c59 => r5c7<>1, r5c78<>3
  32. Hidden Triple: 1,2,3 in r5c9,r6c78 => r6c78<>8, r6c8<>9
  33. X-Wing: 3 c68 r26 => r2c5<>3
  34. XYZ-Wing: 1/2/7 in r68c7,r8c8 => r9c7<>2
  35. Continuous Nice Loop: 2/7/8/9 3= r1c5 =1= r1c1 =9= r3c1 -9- r3c7 -2- r6c7 -1- r6c4 =1= r5c5 =3= r1c5 =1 => r8c7<>2, r1c5<>7, r1c1<>8, r3c9<>9
  36. Row 2 / Column 5 → 7 (Hidden Single)
  37. XY-Wing: 1/7/2 in r68c7,r8c8 => r6c8<>2
  38. Row 6 / Column 8 → 3 (Naked Single)
  39. Row 5 / Column 9 → 1 (Naked Single)
  40. Row 6 / Column 6 → 9 (Naked Single)
  41. Row 2 / Column 6 → 3 (Full House)
  42. Row 5 / Column 5 → 3 (Naked Single)
  43. Row 6 / Column 7 → 2 (Naked Single)
  44. Row 4 / Column 4 → 8 (Naked Single)
  45. Row 6 / Column 4 → 1 (Full House)
  46. Row 6 / Column 2 → 8 (Full House)
  47. Row 2 / Column 4 → 9 (Full House)
  48. Row 1 / Column 5 → 1 (Full House)
  49. Row 3 / Column 7 → 9 (Naked Single)
  50. Row 5 / Column 1 → 2 (Naked Single)
  51. Row 1 / Column 1 → 9 (Naked Single)
  52. Row 3 / Column 1 → 6 (Naked Single)
  53. Row 3 / Column 3 → 7 (Naked Single)
  54. Row 3 / Column 9 → 2 (Full House)
  55. Row 8 / Column 1 → 1 (Naked Single)
  56. Row 7 / Column 1 → 8 (Full House)
  57. Row 1 / Column 3 → 8 (Naked Single)
  58. Row 2 / Column 8 → 8 (Naked Single)
  59. Row 8 / Column 7 → 7 (Naked Single)
  60. Row 7 / Column 5 → 9 (Naked Single)
  61. Row 9 / Column 5 → 8 (Full House)
  62. Row 1 / Column 7 → 3 (Naked Single)
  63. Row 1 / Column 9 → 7 (Full House)
  64. Row 2 / Column 3 → 2 (Naked Single)
  65. Row 2 / Column 2 → 1 (Full House)
  66. Row 5 / Column 8 → 9 (Naked Single)
  67. Row 4 / Column 7 → 6 (Naked Single)
  68. Row 8 / Column 8 → 2 (Naked Single)
  69. Row 4 / Column 8 → 7 (Full House)
  70. Row 4 / Column 2 → 9 (Full House)
  71. Row 5 / Column 7 → 8 (Full House)
  72. Row 8 / Column 2 → 6 (Full House)
  73. Row 7 / Column 9 → 3 (Naked Single)
  74. Row 9 / Column 9 → 9 (Full House)
  75. Row 9 / Column 7 → 5 (Naked Single)
  76. Row 7 / Column 7 → 1 (Full House)
  77. Row 7 / Column 3 → 5 (Full House)
  78. Row 5 / Column 2 → 5 (Naked Single)
  79. Row 9 / Column 2 → 2 (Full House)
  80. Row 9 / Column 3 → 3 (Full House)
  81. Row 5 / Column 3 → 6 (Full House)
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