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

This Sudoku Puzzle has 67 steps and it is solved using Hidden Single, Locked Candidates Type 2 (Claiming), Naked Pair, Naked Single, Locked Candidates Type 1 (Pointing), undefined, Empty Rectangle, Uniqueness Test 3, Remote Pair, 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 2 / Column 6 → 1 (Hidden Single)
  2. Row 4 / Column 2 → 4 (Hidden Single)
  3. Row 1 / Column 1 → 4 (Hidden Single)
  4. Row 7 / Column 7 → 3 (Hidden Single)
  5. Row 2 / Column 8 → 3 (Hidden Single)
  6. Row 2 / Column 5 → 4 (Hidden Single)
  7. Row 1 / Column 2 → 1 (Hidden Single)
  8. Row 4 / Column 8 → 1 (Hidden Single)
  9. Row 3 / Column 9 → 1 (Hidden Single)
  10. Row 4 / Column 6 → 8 (Hidden Single)
  11. Locked Candidates Type 2 (Claiming): 8 in r8 => r79c9,r9c78<>8
  12. Row 1 / Column 7 → 8 (Hidden Single)
  13. Naked Pair: 6,9 in r14c3 => r3569c3<>6, r35679c3<>9
  14. Naked Pair: 3,5 in r36c3 => r57c3<>5
  15. Row 5 / Column 3 → 1 (Naked Single)
  16. Row 9 / Column 1 → 1 (Hidden Single)
  17. Locked Candidates Type 1 (Pointing): 6 in b7 => r8c46<>6
  18. Naked Pair: 2,9 in r19c8 => r68c8<>9, r8c8<>2
  19. 2-String Kite: 2 in r5c1,r8c4 (connected by r5c5,r6c4) => r8c1<>2
  20. 2-String Kite: 7 in r1c5,r9c7 (connected by r1c9,r2c7) => r9c5<>7
  21. Empty Rectangle: 5 in b4 (r68c8) => r8c1<>5
  22. Uniqueness Test 3: 7/8 in r7c35,r9c35 => r1c5<>6, r1c5<>9
  23. Row 1 / Column 5 → 7 (Naked Single)
  24. Naked Pair: 6,9 in r24c4 => r6c4<>6, r68c4<>9
  25. Remote Pair: 6/9 r1c3 -9- r4c3 -6- r4c4 -9- r2c4 => r2c2<>6, r2c2<>9
  26. Row 2 / Column 2 → 5 (Naked Single)
  27. Row 3 / Column 3 → 3 (Naked Single)
  28. Row 6 / Column 3 → 5 (Naked Single)
  29. Row 6 / Column 8 → 8 (Naked Single)
  30. Row 8 / Column 8 → 5 (Naked Single)
  31. Row 3 / Column 7 → 5 (Hidden Single)
  32. Row 7 / Column 1 → 5 (Hidden Single)
  33. Row 6 / Column 1 → 3 (Hidden Single)
  34. Row 8 / Column 9 → 8 (Hidden Single)
  35. Row 5 / Column 9 → 5 (Hidden Single)
  36. Row 5 / Column 1 → 2 (Hidden Single)
  37. Row 6 / Column 4 → 2 (Hidden Single)
  38. Row 8 / Column 4 → 7 (Naked Single)
  39. Row 8 / Column 6 → 9 (Naked Single)
  40. Row 7 / Column 6 → 4 (Naked Single)
  41. Row 8 / Column 1 → 6 (Naked Single)
  42. Row 3 / Column 1 → 9 (Full House)
  43. Row 8 / Column 2 → 2 (Full House)
  44. Row 1 / Column 3 → 6 (Full House)
  45. Row 3 / Column 5 → 6 (Full House)
  46. Row 2 / Column 4 → 9 (Full House)
  47. Row 4 / Column 4 → 6 (Full House)
  48. Row 4 / Column 3 → 9 (Full House)
  49. Row 6 / Column 2 → 6 (Full House)
  50. Row 7 / Column 2 → 9 (Full House)
  51. Row 9 / Column 6 → 6 (Naked Single)
  52. Row 6 / Column 6 → 7 (Full House)
  53. Row 5 / Column 5 → 9 (Full House)
  54. Row 6 / Column 9 → 9 (Full House)
  55. Row 5 / Column 7 → 6 (Full House)
  56. Row 1 / Column 9 → 2 (Naked Single)
  57. Row 1 / Column 8 → 9 (Full House)
  58. Row 9 / Column 8 → 2 (Full House)
  59. Row 2 / Column 7 → 7 (Naked Single)
  60. Row 2 / Column 9 → 6 (Full House)
  61. Row 9 / Column 7 → 9 (Full House)
  62. Row 7 / Column 9 → 7 (Naked Single)
  63. Row 9 / Column 9 → 4 (Full House)
  64. Row 9 / Column 5 → 8 (Naked Single)
  65. Row 7 / Column 5 → 2 (Full House)
  66. Row 7 / Column 3 → 8 (Full House)
  67. Row 9 / Column 3 → 7 (Full House)
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