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

This Sudoku Puzzle has 89 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), undefined, Locked Pair, Naked Triple, Empty Rectangle, AIC, Uniqueness Test 4, Hidden Rectangle, Naked Single, Continuous Nice Loop, Locked Triple, 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 6 / Column 7 → 1 (Hidden Single)
  2. Row 4 / Column 8 → 2 (Hidden Single)
  3. Row 2 / Column 5 → 5 (Hidden Single)
  4. Row 8 / Column 9 → 2 (Hidden Single)
  5. Row 3 / Column 7 → 8 (Hidden Single)
  6. Row 7 / Column 5 → 2 (Hidden Single)
  7. Row 7 / Column 4 → 3 (Hidden Single)
  8. Row 8 / Column 4 → 4 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 3 in b2 => r4c6<>3
  10. Locked Candidates Type 1 (Pointing): 7 in b2 => r4c6<>7
  11. Locked Candidates Type 1 (Pointing): 3 in b6 => r5c5<>3
  12. Locked Candidates Type 1 (Pointing): 5 in b7 => r3c2<>5
  13. Locked Candidates Type 1 (Pointing): 8 in b8 => r8c1<>8
  14. Locked Candidates Type 2 (Claiming): 1 in r7 => r89c2<>1
  15. Locked Candidates Type 2 (Claiming): 6 in c4 => r123c6<>6
  16. XYZ-Wing: 4/5/6 in r79c7,r9c2 => r9c9<>4
  17. Locked Candidates Type 1 (Pointing): 4 in b9 => r45c7<>4
  18. Locked Pair: 7,9 in r45c7 => r1c7,r5c9<>7, r1c7,r5c8<>9
  19. Locked Candidates Type 1 (Pointing): 4 in b6 => r5c3<>4
  20. Naked Triple: 1,6,9 in r9c569 => r9c7<>6
  21. Empty Rectangle: 6 in b7 (r17c7) => r1c1<>6
  22. AIC: 4 4- r3c1 =4= r7c1 =8= r7c3 -8- r5c3 =8= r5c5 -8- r8c5 -6- r8c1 -7- r8c2 -5- r9c2 -4 => r23c2,r7c1<>4
  23. Row 3 / Column 1 → 4 (Hidden Single)
  24. Locked Candidates Type 1 (Pointing): 6 in b1 => r7c3<>6
  25. Uniqueness Test 4: 3/4 in r2c89,r5c89 => r2c89<>3
  26. AIC: 7 7- r1c1 -3- r2c2 =3= r2c6 =8= r8c6 -8- r8c5 -6- r8c1 =6= r7c1 =8= r7c3 -8- r5c3 -7 => r123c3,r6c1<>7
  27. Locked Candidates Type 2 (Claiming): 7 in c3 => r46c2<>7
  28. XY-Chain: 8 8- r6c1 -3- r1c1 -7- r8c1 -6- r8c5 -8 => r6c5<>8
  29. XY-Chain: 6 6- r4c6 -9- r6c4 -8- r6c1 -3- r1c1 -7- r8c1 -6 => r8c6<>6
  30. Hidden Rectangle: 6/9 in r4c56,r9c56 => r4c6<>9
  31. Row 4 / Column 6 → 6 (Naked Single)
  32. Continuous Nice Loop: 3/7 8= r2c6 =3= r2c2 -3- r1c1 -7- r8c1 -6- r8c5 -8- r8c6 =8= r2c6 =3 => r3c2<>3, r2c6<>7
  33. AIC: 6 6- r1c7 -5- r9c7 =5= r8c8 =1= r8c6 =8= r2c6 -8- r2c4 -6 => r1c4,r2c9<>6
  34. XY-Chain: 2 2- r1c4 -9- r6c4 -8- r6c1 -3- r1c1 -7- r3c2 -2 => r1c3,r3c4<>2
  35. Row 1 / Column 4 → 2 (Hidden Single)
  36. Hidden Rectangle: 2/7 in r3c23,r6c23 => r6c3<>7
  37. Row 6 / Column 5 → 7 (Hidden Single)
  38. Row 4 / Column 5 → 3 (Hidden Single)
  39. XY-Chain: 2 2- r3c2 -7- r1c1 -3- r6c1 -8- r6c3 -2 => r3c3,r6c2<>2
  40. Row 3 / Column 2 → 2 (Hidden Single)
  41. Row 6 / Column 3 → 2 (Hidden Single)
  42. Locked Triple: 1,5,6 in r123c3 => r2c2,r7c3<>1
  43. Row 7 / Column 2 → 1 (Hidden Single)
  44. XY-Chain: 5 5- r1c7 -6- r7c7 -4- r7c3 -8- r5c3 -7- r5c7 -9- r5c5 -8- r6c4 -9- r3c4 -6- r3c3 -5 => r1c3,r3c8<>5
  45. Row 3 / Column 3 → 5 (Hidden Single)
  46. W-Wing: 1/6 in r1c3,r9c9 connected by 6 in r17c7 => r1c9<>1
  47. XY-Chain: 3 3- r1c1 -7- r2c2 -3- r2c6 -8- r2c4 -6- r3c4 -9- r3c8 -3 => r1c89<>3
  48. Locked Candidates Type 1 (Pointing): 3 in b3 => r3c6<>3
  49. XY-Chain: 3 3- r1c1 -7- r1c9 -6- r1c3 -1- r2c3 -6- r2c4 -8- r2c6 -3 => r1c6,r2c2<>3
  50. Row 2 / Column 2 → 7 (Naked Single)
  51. Row 1 / Column 1 → 3 (Naked Single)
  52. Row 8 / Column 2 → 5 (Naked Single)
  53. Row 6 / Column 1 → 8 (Naked Single)
  54. Row 8 / Column 8 → 1 (Naked Single)
  55. Row 9 / Column 2 → 4 (Naked Single)
  56. Row 5 / Column 3 → 7 (Naked Single)
  57. Row 6 / Column 4 → 9 (Naked Single)
  58. Row 5 / Column 5 → 8 (Full House)
  59. Row 6 / Column 2 → 3 (Full House)
  60. Row 4 / Column 2 → 9 (Full House)
  61. Row 4 / Column 3 → 4 (Full House)
  62. Row 4 / Column 7 → 7 (Full House)
  63. Row 7 / Column 1 → 6 (Naked Single)
  64. Row 8 / Column 1 → 7 (Full House)
  65. Row 7 / Column 3 → 8 (Full House)
  66. Row 7 / Column 7 → 4 (Full House)
  67. Row 2 / Column 8 → 4 (Naked Single)
  68. Row 8 / Column 6 → 8 (Naked Single)
  69. Row 8 / Column 5 → 6 (Full House)
  70. Row 9 / Column 5 → 9 (Full House)
  71. Row 9 / Column 6 → 1 (Full House)
  72. Row 9 / Column 9 → 6 (Naked Single)
  73. Row 9 / Column 7 → 5 (Full House)
  74. Row 5 / Column 7 → 9 (Naked Single)
  75. Row 1 / Column 7 → 6 (Full House)
  76. Row 3 / Column 4 → 6 (Naked Single)
  77. Row 2 / Column 4 → 8 (Full House)
  78. Row 2 / Column 9 → 1 (Naked Single)
  79. Row 5 / Column 8 → 3 (Naked Single)
  80. Row 5 / Column 9 → 4 (Full House)
  81. Row 2 / Column 6 → 3 (Naked Single)
  82. Row 2 / Column 3 → 6 (Full House)
  83. Row 1 / Column 3 → 1 (Full House)
  84. Row 1 / Column 9 → 7 (Naked Single)
  85. Row 3 / Column 9 → 3 (Full House)
  86. Row 3 / Column 8 → 9 (Naked Single)
  87. Row 1 / Column 8 → 5 (Full House)
  88. Row 1 / Column 6 → 9 (Full House)
  89. Row 3 / Column 6 → 7 (Full House)
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