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

This Sudoku Puzzle has 69 steps and it is solved using Hidden Single, Naked Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Full House, Naked Pair, Hidden Rectangle, Sue de Coq, undefined techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 5 / Column 5 → 1 (Hidden Single)
  2. Row 7 / Column 7 → 4 (Hidden Single)
  3. Row 1 / Column 5 → 6 (Hidden Single)
  4. Row 7 / Column 9 → 5 (Hidden Single)
  5. Row 1 / Column 6 → 2 (Hidden Single)
  6. Row 3 / Column 5 → 4 (Hidden Single)
  7. Row 5 / Column 8 → 2 (Hidden Single)
  8. Row 6 / Column 8 → 4 (Naked Single)
  9. Row 4 / Column 8 → 5 (Naked Single)
  10. Row 6 / Column 4 → 2 (Hidden Single)
  11. Row 1 / Column 7 → 7 (Hidden Single)
  12. Row 3 / Column 7 → 5 (Hidden Single)
  13. Locked Candidates Type 1 (Pointing): 5 in b2 => r2c1<>5
  14. Locked Candidates Type 1 (Pointing): 9 in b3 => r56c9<>9
  15. Locked Candidates Type 1 (Pointing): 7 in b5 => r38c6<>7
  16. Row 3 / Column 4 → 7 (Hidden Single)
  17. Locked Candidates Type 1 (Pointing): 3 in b6 => r6c6<>3
  18. Locked Candidates Type 1 (Pointing): 3 in b9 => r9c134<>3
  19. Locked Candidates Type 1 (Pointing): 3 in b8 => r8c1<>3
  20. Locked Candidates Type 2 (Claiming): 8 in r7 => r8c2,r9c3<>8
  21. Locked Candidates Type 2 (Claiming): 9 in c5 => r8c46,r9c4<>9
  22. Row 9 / Column 4 → 8 (Naked Single)
  23. Row 9 / Column 7 → 3 (Naked Single)
  24. Row 6 / Column 7 → 9 (Naked Single)
  25. Row 5 / Column 7 → 8 (Full House)
  26. Row 9 / Column 9 → 1 (Naked Single)
  27. Row 5 / Column 9 → 6 (Naked Single)
  28. Row 6 / Column 9 → 3 (Full House)
  29. Row 9 / Column 8 → 7 (Naked Single)
  30. Row 8 / Column 8 → 8 (Full House)
  31. Row 2 / Column 8 → 1 (Full House)
  32. Naked Pair: 8,9 in r3c69 => r3c13<>9, r3c3<>8
  33. Hidden Rectangle: 5/9 in r1c13,r5c13 => r1c1<>9
  34. Sue de Coq: r79c3 - {3689} (r36c3 - {136}, r78c2,r8c1 - {1789}) => r7c1<>7, r9c1<>9
  35. XY-Chain: 3 3- r3c3 -1- r6c3 -6- r6c6 -7- r5c6 -9- r4c4 -3- r8c4 -5- r2c4 -9- r2c1 -6- r9c1 -2- r7c1 -3 => r3c1,r7c3<>3
  36. Row 3 / Column 1 → 1 (Naked Single)
  37. Row 7 / Column 3 → 8 (Naked Single)
  38. Row 3 / Column 3 → 3 (Naked Single)
  39. Row 7 / Column 2 → 7 (Naked Single)
  40. Row 7 / Column 5 → 2 (Naked Single)
  41. Row 7 / Column 1 → 3 (Full House)
  42. Row 8 / Column 1 → 9 (Naked Single)
  43. Row 9 / Column 5 → 9 (Naked Single)
  44. Row 8 / Column 5 → 7 (Full House)
  45. Row 2 / Column 1 → 6 (Naked Single)
  46. Row 8 / Column 2 → 1 (Naked Single)
  47. Row 9 / Column 3 → 6 (Naked Single)
  48. Row 9 / Column 1 → 2 (Full House)
  49. Row 4 / Column 1 → 4 (Naked Single)
  50. Row 6 / Column 2 → 6 (Naked Single)
  51. Row 6 / Column 3 → 1 (Naked Single)
  52. Row 6 / Column 6 → 7 (Full House)
  53. Row 1 / Column 1 → 5 (Naked Single)
  54. Row 5 / Column 1 → 7 (Full House)
  55. Row 4 / Column 2 → 9 (Naked Single)
  56. Row 5 / Column 3 → 5 (Full House)
  57. Row 5 / Column 6 → 9 (Full House)
  58. Row 1 / Column 3 → 9 (Full House)
  59. Row 2 / Column 2 → 8 (Naked Single)
  60. Row 1 / Column 2 → 4 (Full House)
  61. Row 1 / Column 9 → 8 (Full House)
  62. Row 3 / Column 9 → 9 (Full House)
  63. Row 3 / Column 6 → 8 (Full House)
  64. Row 4 / Column 4 → 3 (Naked Single)
  65. Row 4 / Column 6 → 6 (Full House)
  66. Row 2 / Column 6 → 5 (Naked Single)
  67. Row 2 / Column 4 → 9 (Full House)
  68. Row 8 / Column 4 → 5 (Full House)
  69. Row 8 / Column 6 → 3 (Full House)
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