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

This Sudoku Puzzle has 77 steps and it is solved using Hidden Single, Locked Candidates Type 2 (Claiming), undefined, Discontinuous Nice Loop, Naked Single, Locked Candidates Type 1 (Pointing), Naked Triple, Empty Rectangle, Sue de Coq, Full House, Hidden Rectangle 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 2 / Column 2 → 7 (Hidden Single)
  2. Row 6 / Column 4 → 7 (Hidden Single)
  3. Row 8 / Column 4 → 2 (Hidden Single)
  4. Row 2 / Column 8 → 8 (Hidden Single)
  5. Row 8 / Column 3 → 7 (Hidden Single)
  6. Locked Candidates Type 2 (Claiming): 6 in r2 => r3c4<>6
  7. X-Wing: 3 r68 c16 => r2479c6,r79c1<>3
  8. 2-String Kite: 5 in r5c9,r8c6 (connected by r7c9,r8c8) => r5c6<>5
  9. Discontinuous Nice Loop: 1/3/9 r1c9 =2= r1c7 -2- r4c7 -4- r6c8 =4= r6c6 =3= r8c6 =5= r8c8 -5- r4c8 =5= r5c9 =2= r1c9 => r1c9<>1, r1c9<>3, r1c9<>9
  10. Row 1 / Column 9 → 2 (Naked Single)
  11. Discontinuous Nice Loop: 1/6/8/9 r5c1 =2= r5c7 =7= r5c9 =5= r7c9 -5- r8c8 =5= r8c6 =3= r6c6 =4= r6c8 -4- r4c7 -2- r4c2 =2= r5c1 => r5c1<>1, r5c1<>6, r5c1<>8, r5c1<>9
  12. Row 5 / Column 1 → 2 (Naked Single)
  13. Row 5 / Column 7 → 7 (Naked Single)
  14. Row 5 / Column 3 → 6 (Hidden Single)
  15. Row 4 / Column 7 → 2 (Hidden Single)
  16. Row 7 / Column 2 → 2 (Hidden Single)
  17. Row 5 / Column 6 → 8 (Hidden Single)
  18. Row 6 / Column 2 → 8 (Hidden Single)
  19. Locked Candidates Type 1 (Pointing): 1 in b4 => r4c46<>1
  20. Locked Candidates Type 1 (Pointing): 4 in b6 => r1c8<>4
  21. Naked Triple: 1,6,9 in r1c238 => r1c15<>1, r1c17<>6, r1c15<>9
  22. Row 1 / Column 1 → 5 (Naked Single)
  23. Empty Rectangle: 9 in b2 (r5c59) => r2c9<>9
  24. Locked Candidates Type 2 (Claiming): 9 in r2 => r3c5<>9
  25. XY-Wing: 5/9/1 in r35c9,r5c4 => r3c4<>1
  26. Sue de Coq: r789c1 - {13689} (r6c1 - {39}, r8c2 - {16}) => r79c3<>1, r3c1,r79c3<>8, r3c1<>9
  27. Row 3 / Column 3 → 8 (Hidden Single)
  28. Row 3 / Column 9 → 9 (Hidden Single)
  29. Row 5 / Column 9 → 5 (Naked Single)
  30. Row 5 / Column 4 → 1 (Naked Single)
  31. Row 5 / Column 5 → 9 (Full House)
  32. Row 2 / Column 6 → 9 (Hidden Single)
  33. Row 2 / Column 4 → 6 (Hidden Single)
  34. Locked Candidates Type 1 (Pointing): 1 in b2 => r79c5<>1
  35. Locked Candidates Type 1 (Pointing): 3 in b2 => r79c5<>3
  36. W-Wing: 4/3 in r6c6,r7c3 connected by 3 in r4c34 => r7c6<>4
  37. W-Wing: 4/3 in r7c3,r9c4 connected by 3 in r4c34 => r7c5,r9c3<>4
  38. Row 7 / Column 3 → 4 (Hidden Single)
  39. Locked Candidates Type 2 (Claiming): 3 in r7 => r9c79<>3
  40. Hidden Rectangle: 6/8 in r7c17,r9c17 => r7c1<>6
  41. XY-Chain: 1 1- r1c8 -6- r3c7 -4- r1c7 -3- r1c5 -4- r9c5 -7- r9c9 -1 => r2c9,r78c8<>1
  42. Row 2 / Column 9 → 3 (Naked Single)
  43. Row 2 / Column 5 → 1 (Full House)
  44. Row 1 / Column 7 → 4 (Naked Single)
  45. Row 1 / Column 5 → 3 (Naked Single)
  46. Row 3 / Column 7 → 6 (Naked Single)
  47. Row 1 / Column 8 → 1 (Full House)
  48. Row 3 / Column 1 → 1 (Naked Single)
  49. Row 9 / Column 7 → 8 (Naked Single)
  50. Row 7 / Column 7 → 3 (Full House)
  51. Row 1 / Column 3 → 9 (Naked Single)
  52. Row 1 / Column 2 → 6 (Full House)
  53. Row 7 / Column 1 → 8 (Naked Single)
  54. Row 9 / Column 3 → 3 (Naked Single)
  55. Row 4 / Column 3 → 1 (Full House)
  56. Row 8 / Column 2 → 1 (Naked Single)
  57. Row 4 / Column 2 → 9 (Full House)
  58. Row 6 / Column 1 → 3 (Full House)
  59. Row 8 / Column 1 → 6 (Naked Single)
  60. Row 9 / Column 1 → 9 (Full House)
  61. Row 9 / Column 4 → 4 (Naked Single)
  62. Row 4 / Column 8 → 4 (Naked Single)
  63. Row 6 / Column 8 → 9 (Full House)
  64. Row 6 / Column 6 → 4 (Full House)
  65. Row 8 / Column 8 → 5 (Naked Single)
  66. Row 7 / Column 8 → 6 (Full House)
  67. Row 8 / Column 6 → 3 (Full House)
  68. Row 3 / Column 4 → 5 (Naked Single)
  69. Row 3 / Column 5 → 4 (Full House)
  70. Row 4 / Column 4 → 3 (Full House)
  71. Row 4 / Column 6 → 5 (Full House)
  72. Row 9 / Column 5 → 7 (Naked Single)
  73. Row 7 / Column 5 → 5 (Full House)
  74. Row 7 / Column 6 → 1 (Naked Single)
  75. Row 7 / Column 9 → 7 (Full House)
  76. Row 9 / Column 9 → 1 (Full House)
  77. Row 9 / Column 6 → 6 (Full House)
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