Solution for Hard Sudoku #2182619357418

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

This Sudoku Puzzle has 61 steps and it is solved using Hidden Single, Locked Triple, Naked Single, Locked Candidates Type 1 (Pointing), Naked Pair, undefined, Skyscraper, Full House techniques.

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

Solution Steps:

  1. Row 2 / Column 2 → 2 (Hidden Single)
  2. Locked Triple: 1,2,6 in r456c7 => r37c7,r46c8,r5c9<>6, r5c9,r7c7<>1, r46c8<>2
  3. Row 5 / Column 9 → 5 (Naked Single)
  4. Row 5 / Column 3 → 2 (Naked Single)
  5. Locked Candidates Type 1 (Pointing): 3 in b4 => r3c3<>3
  6. Locked Candidates Type 1 (Pointing): 3 in b6 => r78c8<>3
  7. Locked Candidates Type 1 (Pointing): 7 in b6 => r2c8<>7
  8. Naked Pair: 1,6 in r5c17 => r5c46<>1, r5c6<>6
  9. X-Wing: 9 c37 r37 => r3c2568,r7c2458<>9
  10. Skyscraper: 9 in r1c2,r2c5 (connected by r8c25) => r1c46<>9
  11. Row 1 / Column 2 → 9 (Hidden Single)
  12. Row 3 / Column 7 → 9 (Hidden Single)
  13. Row 7 / Column 7 → 4 (Naked Single)
  14. Row 7 / Column 3 → 9 (Hidden Single)
  15. Row 3 / Column 2 → 8 (Hidden Single)
  16. Row 3 / Column 8 → 6 (Naked Single)
  17. Row 2 / Column 8 → 8 (Naked Single)
  18. Row 2 / Column 9 → 7 (Naked Single)
  19. Row 1 / Column 9 → 4 (Full House)
  20. Row 7 / Column 8 → 5 (Naked Single)
  21. Row 2 / Column 1 → 5 (Naked Single)
  22. Row 2 / Column 4 → 9 (Naked Single)
  23. Row 2 / Column 5 → 6 (Full House)
  24. Row 3 / Column 3 → 4 (Naked Single)
  25. Row 5 / Column 4 → 8 (Naked Single)
  26. Row 3 / Column 1 → 3 (Naked Single)
  27. Row 1 / Column 1 → 7 (Full House)
  28. Row 6 / Column 3 → 3 (Naked Single)
  29. Row 4 / Column 3 → 5 (Full House)
  30. Row 1 / Column 4 → 3 (Naked Single)
  31. Row 1 / Column 6 → 8 (Full House)
  32. Row 5 / Column 6 → 9 (Naked Single)
  33. Row 3 / Column 6 → 1 (Naked Single)
  34. Row 3 / Column 5 → 5 (Full House)
  35. Row 6 / Column 8 → 7 (Naked Single)
  36. Row 7 / Column 4 → 1 (Naked Single)
  37. Row 9 / Column 6 → 2 (Naked Single)
  38. Row 4 / Column 8 → 3 (Naked Single)
  39. Row 6 / Column 5 → 1 (Naked Single)
  40. Row 6 / Column 4 → 2 (Naked Single)
  41. Row 9 / Column 4 → 5 (Full House)
  42. Row 7 / Column 2 → 6 (Naked Single)
  43. Row 7 / Column 5 → 8 (Naked Single)
  44. Row 7 / Column 9 → 3 (Full House)
  45. Row 8 / Column 5 → 9 (Naked Single)
  46. Row 8 / Column 6 → 3 (Full House)
  47. Row 4 / Column 6 → 6 (Full House)
  48. Row 4 / Column 5 → 7 (Full House)
  49. Row 9 / Column 8 → 9 (Naked Single)
  50. Row 8 / Column 8 → 2 (Full House)
  51. Row 6 / Column 7 → 6 (Naked Single)
  52. Row 6 / Column 2 → 4 (Full House)
  53. Row 4 / Column 2 → 1 (Naked Single)
  54. Row 4 / Column 7 → 2 (Full House)
  55. Row 5 / Column 7 → 1 (Full House)
  56. Row 5 / Column 1 → 6 (Full House)
  57. Row 8 / Column 2 → 5 (Full House)
  58. Row 9 / Column 1 → 1 (Naked Single)
  59. Row 8 / Column 1 → 4 (Full House)
  60. Row 8 / Column 9 → 1 (Full House)
  61. Row 9 / Column 9 → 6 (Full House)
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