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

This Sudoku Puzzle has 63 steps and it is solved using Naked Single, Hidden Single, Full House, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Skyscraper, Sue de Coq, undefined 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 8 / Column 2 → 5 (Naked Single)
  2. Row 4 / Column 2 → 9 (Naked Single)
  3. Row 1 / Column 4 → 1 (Hidden Single)
  4. Row 1 / Column 2 → 6 (Naked Single)
  5. Row 3 / Column 2 → 1 (Full House)
  6. Row 1 / Column 5 → 8 (Naked Single)
  7. Row 1 / Column 6 → 5 (Naked Single)
  8. Row 7 / Column 3 → 1 (Hidden Single)
  9. Row 4 / Column 1 → 5 (Hidden Single)
  10. Row 3 / Column 1 → 7 (Naked Single)
  11. Row 1 / Column 3 → 3 (Naked Single)
  12. Row 7 / Column 1 → 6 (Naked Single)
  13. Row 2 / Column 1 → 9 (Naked Single)
  14. Row 6 / Column 3 → 6 (Naked Single)
  15. Row 6 / Column 1 → 3 (Naked Single)
  16. Row 9 / Column 1 → 2 (Full House)
  17. Row 5 / Column 3 → 2 (Full House)
  18. Row 8 / Column 3 → 7 (Full House)
  19. Row 3 / Column 8 → 6 (Hidden Single)
  20. Row 4 / Column 8 → 2 (Hidden Single)
  21. Row 8 / Column 6 → 2 (Hidden Single)
  22. Row 1 / Column 7 → 2 (Hidden Single)
  23. Locked Candidates Type 1 (Pointing): 4 in b2 => r2c789<>4
  24. Locked Candidates Type 2 (Claiming): 7 in c7 => r79c8,r9c9<>7
  25. Skyscraper: 9 in r5c7,r6c5 (connected by r7c57) => r5c4,r6c89<>9
  26. Row 6 / Column 5 → 9 (Hidden Single)
  27. Row 1 / Column 9 → 9 (Hidden Single)
  28. Row 1 / Column 8 → 7 (Full House)
  29. Sue de Coq: r79c5 - {3467} (r4c5 - {37}, r789c4 - {4569}) => r7c6<>4, r9c6<>6
  30. XY-Chain: 1 1- r6c8 -4- r8c8 -9- r8c4 -4- r5c4 -6- r9c4 -5- r9c9 -1 => r46c9,r9c8<>1
  31. Row 4 / Column 6 → 1 (Hidden Single)
  32. Row 6 / Column 8 → 1 (Hidden Single)
  33. W-Wing: 7/4 in r6c6,r7c5 connected by 4 in r2c56 => r4c5,r79c6<>7
  34. Row 4 / Column 5 → 3 (Naked Single)
  35. Row 4 / Column 9 → 7 (Full House)
  36. Row 7 / Column 6 → 8 (Naked Single)
  37. Row 6 / Column 9 → 4 (Naked Single)
  38. Row 6 / Column 6 → 7 (Full House)
  39. Row 9 / Column 6 → 3 (Naked Single)
  40. Row 3 / Column 9 → 5 (Naked Single)
  41. Row 5 / Column 7 → 9 (Naked Single)
  42. Row 5 / Column 8 → 3 (Full House)
  43. Row 3 / Column 3 → 8 (Naked Single)
  44. Row 2 / Column 3 → 5 (Full House)
  45. Row 3 / Column 7 → 4 (Full House)
  46. Row 9 / Column 9 → 1 (Naked Single)
  47. Row 2 / Column 9 → 3 (Full House)
  48. Row 2 / Column 8 → 8 (Naked Single)
  49. Row 2 / Column 7 → 1 (Full House)
  50. Row 7 / Column 7 → 7 (Naked Single)
  51. Row 9 / Column 7 → 8 (Full House)
  52. Row 9 / Column 8 → 5 (Naked Single)
  53. Row 7 / Column 5 → 4 (Naked Single)
  54. Row 9 / Column 4 → 6 (Naked Single)
  55. Row 9 / Column 5 → 7 (Full House)
  56. Row 2 / Column 5 → 6 (Full House)
  57. Row 2 / Column 6 → 4 (Full House)
  58. Row 5 / Column 6 → 6 (Full House)
  59. Row 5 / Column 4 → 4 (Full House)
  60. Row 7 / Column 8 → 9 (Naked Single)
  61. Row 7 / Column 4 → 5 (Full House)
  62. Row 8 / Column 4 → 9 (Full House)
  63. Row 8 / Column 8 → 4 (Full House)
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