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

This Sudoku Puzzle has 77 steps and it is solved using Locked Candidates Type 1 (Pointing), Hidden Pair, Hidden Single, Naked Pair, Naked Single, Naked Triple, Locked Candidates Type 2 (Claiming), Locked Pair, Full House, undefined techniques.

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

Solution Steps:

  1. Locked Candidates Type 1 (Pointing): 6 in b4 => r5c4589<>6
  2. Locked Candidates Type 1 (Pointing): 8 in b4 => r137c1<>8
  3. Hidden Pair: 7,9 in r8c6,r9c5 => r8c6,r9c5<>1, r8c6<>5, r9c5<>4
  4. Hidden Pair: 2,9 in r69c7 => r69c7<>1, r69c7<>5, r6c7<>6, r6c7<>7
  5. Row 7 / Column 7 → 1 (Hidden Single)
  6. Locked Candidates Type 1 (Pointing): 1 in b8 => r2356c4<>1
  7. Naked Pair: 4,5 in r7c16 => r7c35<>4, r7c38<>5
  8. Row 7 / Column 5 → 3 (Naked Single)
  9. Naked Triple: 1,4,5 in r589c4 => r23c4<>4, r6c4<>5
  10. Hidden Pair: 1,9 in r2c36 => r2c36<>4, r2c3<>7, r2c36<>8, r2c6<>2
  11. Row 2 / Column 2 → 2 (Hidden Single)
  12. Row 8 / Column 1 → 2 (Hidden Single)
  13. Row 3 / Column 1 → 1 (Hidden Single)
  14. Row 2 / Column 3 → 9 (Naked Single)
  15. Row 2 / Column 6 → 1 (Naked Single)
  16. Locked Candidates Type 1 (Pointing): 7 in b1 => r3c78<>7
  17. Locked Candidates Type 2 (Claiming): 4 in r2 => r3c8<>4
  18. Locked Candidates Type 2 (Claiming): 7 in c1 => r5c23<>7
  19. Locked Pair: 5,6 in r5c23 => r456c1,r5c489<>5
  20. Row 5 / Column 4 → 4 (Naked Single)
  21. Row 5 / Column 9 → 1 (Naked Single)
  22. Row 9 / Column 3 → 4 (Hidden Single)
  23. Row 7 / Column 1 → 5 (Naked Single)
  24. Row 1 / Column 1 → 4 (Naked Single)
  25. Row 7 / Column 6 → 4 (Naked Single)
  26. Row 6 / Column 5 → 1 (Hidden Single)
  27. Row 9 / Column 4 → 1 (Hidden Single)
  28. Row 8 / Column 4 → 5 (Naked Single)
  29. Row 8 / Column 3 → 1 (Hidden Single)
  30. Row 3 / Column 5 → 4 (Hidden Single)
  31. Row 3 / Column 3 → 7 (Hidden Single)
  32. Row 3 / Column 6 → 9 (Hidden Single)
  33. Row 8 / Column 6 → 7 (Naked Single)
  34. Row 9 / Column 5 → 9 (Full House)
  35. Row 8 / Column 2 → 6 (Naked Single)
  36. Row 9 / Column 7 → 2 (Naked Single)
  37. Row 5 / Column 2 → 5 (Naked Single)
  38. Row 7 / Column 3 → 8 (Naked Single)
  39. Row 7 / Column 8 → 6 (Full House)
  40. Row 9 / Column 2 → 7 (Full House)
  41. Row 8 / Column 9 → 3 (Naked Single)
  42. Row 8 / Column 8 → 9 (Full House)
  43. Row 6 / Column 7 → 9 (Naked Single)
  44. Row 5 / Column 3 → 6 (Naked Single)
  45. Row 1 / Column 3 → 5 (Full House)
  46. Row 5 / Column 1 → 9 (Hidden Single)
  47. Locked Candidates Type 1 (Pointing): 6 in b3 => r4c7<>6
  48. W-Wing: 3/8 in r2c4,r3c2 connected by 8 in r1c26 => r3c4<>3
  49. Row 2 / Column 4 → 3 (Hidden Single)
  50. Row 2 / Column 7 → 7 (Naked Single)
  51. Locked Candidates Type 2 (Claiming): 8 in r2 => r3c8<>8
  52. XY-Wing: 6/7/8 in r4c15,r6c4 => r4c6,r6c1<>8
  53. Row 4 / Column 6 → 5 (Naked Single)
  54. Row 6 / Column 1 → 7 (Naked Single)
  55. Row 4 / Column 1 → 8 (Full House)
  56. Row 4 / Column 7 → 3 (Naked Single)
  57. Row 1 / Column 7 → 6 (Naked Single)
  58. Row 3 / Column 7 → 5 (Full House)
  59. Row 1 / Column 5 → 2 (Naked Single)
  60. Row 3 / Column 8 → 3 (Naked Single)
  61. Row 1 / Column 6 → 8 (Naked Single)
  62. Row 1 / Column 2 → 3 (Full House)
  63. Row 3 / Column 2 → 8 (Full House)
  64. Row 3 / Column 4 → 6 (Full House)
  65. Row 6 / Column 6 → 2 (Full House)
  66. Row 6 / Column 4 → 8 (Full House)
  67. Row 5 / Column 5 → 7 (Naked Single)
  68. Row 4 / Column 5 → 6 (Full House)
  69. Row 5 / Column 8 → 2 (Full House)
  70. Row 6 / Column 8 → 5 (Naked Single)
  71. Row 6 / Column 9 → 6 (Full House)
  72. Row 4 / Column 9 → 4 (Naked Single)
  73. Row 4 / Column 8 → 7 (Full House)
  74. Row 9 / Column 8 → 8 (Naked Single)
  75. Row 2 / Column 8 → 4 (Full House)
  76. Row 2 / Column 9 → 8 (Full House)
  77. Row 9 / Column 9 → 5 (Full House)
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