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

This Sudoku Puzzle has 71 steps and it is solved using Hidden Single, Locked Pair, Locked Candidates Type 1 (Pointing), Naked Single, Full House, Locked Candidates Type 2 (Claiming), Naked Pair, undefined, Turbot Fish, Uniqueness Test 4, Hidden Rectangle techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 2 / Column 4 → 1 (Hidden Single)
  2. Row 6 / Column 4 → 8 (Hidden Single)
  3. Row 5 / Column 7 → 8 (Hidden Single)
  4. Row 8 / Column 3 → 1 (Hidden Single)
  5. Row 5 / Column 1 → 1 (Hidden Single)
  6. Row 4 / Column 4 → 7 (Hidden Single)
  7. Row 1 / Column 7 → 1 (Hidden Single)
  8. Row 6 / Column 9 → 1 (Hidden Single)
  9. Row 7 / Column 3 → 7 (Hidden Single)
  10. Row 6 / Column 8 → 7 (Hidden Single)
  11. Row 3 / Column 7 → 7 (Hidden Single)
  12. Row 8 / Column 9 → 7 (Hidden Single)
  13. Row 1 / Column 5 → 7 (Hidden Single)
  14. Row 4 / Column 7 → 3 (Hidden Single)
  15. Row 8 / Column 8 → 3 (Hidden Single)
  16. Row 5 / Column 6 → 3 (Hidden Single)
  17. Row 5 / Column 9 → 2 (Hidden Single)
  18. Locked Pair: 4,6 in r79c9 => r13c9<>6, r3c9,r79c7<>4
  19. Row 2 / Column 7 → 4 (Hidden Single)
  20. Locked Candidates Type 1 (Pointing): 5 in b4 => r123c3<>5
  21. Locked Candidates Type 1 (Pointing): 5 in b6 => r23c8<>5
  22. Row 2 / Column 6 → 5 (Hidden Single)
  23. Row 6 / Column 3 → 5 (Hidden Single)
  24. Row 8 / Column 6 → 2 (Hidden Single)
  25. Row 8 / Column 4 → 6 (Naked Single)
  26. Row 3 / Column 4 → 2 (Hidden Single)
  27. Row 4 / Column 8 → 5 (Hidden Single)
  28. Row 5 / Column 8 → 4 (Full House)
  29. Locked Candidates Type 2 (Claiming): 2 in c1 => r9c3<>2
  30. Naked Pair: 6,9 in r3c58 => r3c13<>6, r3c3<>9
  31. 2-String Kite: 6 in r1c6,r5c3 (connected by r4c6,r5c5) => r1c3<>6
  32. Turbot Fish: 9 r1c6 =9= r6c6 -9- r6c2 =9= r5c3 => r1c3<>9
  33. X-Wing: 9 r16 c26 => r2c2<>9
  34. XYZ-Wing: 4/6/8 in r8c2,r9c39 => r9c1<>4
  35. Uniqueness Test 4: 5/9 in r5c45,r9c45 => r59c5<>9
  36. Hidden Rectangle: 2/6 in r2c23,r4c23 => r4c3<>6
  37. Finned X-Wing: 6 r14 c26 fr1c1 => r2c2<>6
  38. Row 2 / Column 2 → 2 (Naked Single)
  39. Row 4 / Column 3 → 2 (Hidden Single)
  40. Locked Candidates Type 1 (Pointing): 4 in b4 => r8c2<>4
  41. Row 8 / Column 2 → 8 (Naked Single)
  42. Row 8 / Column 5 → 4 (Full House)
  43. Row 7 / Column 5 → 9 (Naked Single)
  44. Row 3 / Column 5 → 6 (Naked Single)
  45. Row 1 / Column 6 → 9 (Full House)
  46. Row 7 / Column 7 → 2 (Naked Single)
  47. Row 9 / Column 7 → 9 (Full House)
  48. Row 9 / Column 4 → 5 (Naked Single)
  49. Row 5 / Column 4 → 9 (Full House)
  50. Row 9 / Column 5 → 8 (Full House)
  51. Row 5 / Column 5 → 5 (Full House)
  52. Row 5 / Column 3 → 6 (Full House)
  53. Row 3 / Column 8 → 9 (Naked Single)
  54. Row 2 / Column 8 → 6 (Full House)
  55. Row 2 / Column 3 → 9 (Full House)
  56. Row 1 / Column 2 → 6 (Naked Single)
  57. Row 6 / Column 6 → 4 (Naked Single)
  58. Row 4 / Column 6 → 6 (Full House)
  59. Row 4 / Column 2 → 4 (Full House)
  60. Row 6 / Column 2 → 9 (Full House)
  61. Row 9 / Column 3 → 4 (Naked Single)
  62. Row 1 / Column 1 → 5 (Naked Single)
  63. Row 3 / Column 3 → 3 (Naked Single)
  64. Row 1 / Column 3 → 8 (Full House)
  65. Row 1 / Column 9 → 3 (Full House)
  66. Row 3 / Column 1 → 4 (Full House)
  67. Row 3 / Column 9 → 5 (Full House)
  68. Row 7 / Column 1 → 6 (Naked Single)
  69. Row 7 / Column 9 → 4 (Full House)
  70. Row 9 / Column 9 → 6 (Full House)
  71. Row 9 / Column 1 → 2 (Full House)
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