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

This Sudoku Puzzle has 74 steps and it is solved using Hidden Single, Locked Triple, Locked Candidates Type 1 (Pointing), Naked Triple, Naked Single, Turbot Fish, Uniqueness Test 3, Hidden Rectangle, undefined, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 5 / Column 2 → 6 (Hidden Single)
  2. Row 4 / Column 9 → 5 (Hidden Single)
  3. Row 2 / Column 3 → 6 (Hidden Single)
  4. Row 6 / Column 3 → 8 (Hidden Single)
  5. Locked Triple: 2,3,7 in r5c456 => r46c5,r5c89<>3, r46c5,r5c89<>7
  6. Row 6 / Column 9 → 7 (Hidden Single)
  7. Locked Candidates Type 1 (Pointing): 2 in b1 => r8c1<>2
  8. Locked Candidates Type 1 (Pointing): 6 in b3 => r78c9<>6
  9. Locked Candidates Type 1 (Pointing): 9 in b4 => r6c7<>9
  10. Locked Candidates Type 1 (Pointing): 1 in b5 => r17c5<>1
  11. Locked Candidates Type 1 (Pointing): 4 in b5 => r78c5<>4
  12. Row 8 / Column 2 → 4 (Hidden Single)
  13. Locked Candidates Type 1 (Pointing): 3 in b6 => r279c7<>3
  14. Locked Candidates Type 1 (Pointing): 1 in b7 => r4c3<>1
  15. Naked Triple: 2,6,9 in r78c7,r8c9 => r7c89<>9, r7c9,r9c7<>2
  16. Row 7 / Column 9 → 3 (Naked Single)
  17. Row 9 / Column 7 → 8 (Naked Single)
  18. Naked Triple: 3,7,8 in r3c128 => r3c46<>7, r3c6<>3, r3c9<>8
  19. Locked Candidates Type 1 (Pointing): 7 in b2 => r2c1<>7
  20. Naked Triple: 2,8,9 in r258c9 => r1c9<>2, r1c9<>8, r1c9<>9
  21. Row 1 / Column 1 → 2 (Hidden Single)
  22. Turbot Fish: 5 r1c2 =5= r2c1 -5- r8c1 =5= r8c5 => r1c5<>5
  23. Uniqueness Test 3: 5/7 in r7c28,r9c28 => r13c2<>3
  24. Locked Candidates Type 1 (Pointing): 3 in b1 => r46c1<>3
  25. Hidden Rectangle: 1/4 in r3c46,r7c46 => r7c6<>1
  26. XY-Chain: 8 8- r3c8 -3- r3c1 -7- r4c1 -1- r4c5 -4- r4c7 -3- r4c3 -7- r8c3 -2- r8c9 -9- r5c9 -8 => r2c9,r5c8<>8
  27. Row 5 / Column 8 → 9 (Naked Single)
  28. Row 5 / Column 9 → 8 (Naked Single)
  29. Row 2 / Column 5 → 8 (Hidden Single)
  30. Row 1 / Column 4 → 9 (Hidden Single)
  31. Row 1 / Column 2 → 5 (Hidden Single)
  32. Row 2 / Column 1 → 3 (Naked Single)
  33. Row 2 / Column 6 → 7 (Naked Single)
  34. Row 3 / Column 1 → 7 (Naked Single)
  35. Row 3 / Column 2 → 8 (Full House)
  36. Row 2 / Column 4 → 5 (Naked Single)
  37. Row 4 / Column 1 → 1 (Naked Single)
  38. Row 3 / Column 8 → 3 (Naked Single)
  39. Row 4 / Column 5 → 4 (Naked Single)
  40. Row 6 / Column 1 → 9 (Naked Single)
  41. Row 8 / Column 1 → 5 (Full House)
  42. Row 1 / Column 8 → 8 (Naked Single)
  43. Row 4 / Column 7 → 3 (Naked Single)
  44. Row 4 / Column 3 → 7 (Full House)
  45. Row 6 / Column 2 → 3 (Full House)
  46. Row 6 / Column 7 → 4 (Full House)
  47. Row 6 / Column 5 → 1 (Full House)
  48. Row 8 / Column 3 → 2 (Naked Single)
  49. Row 9 / Column 2 → 7 (Naked Single)
  50. Row 7 / Column 2 → 9 (Full House)
  51. Row 7 / Column 3 → 1 (Naked Single)
  52. Row 9 / Column 3 → 3 (Full House)
  53. Row 8 / Column 9 → 9 (Naked Single)
  54. Row 9 / Column 8 → 5 (Naked Single)
  55. Row 7 / Column 8 → 7 (Full House)
  56. Row 2 / Column 9 → 2 (Naked Single)
  57. Row 2 / Column 7 → 9 (Full House)
  58. Row 8 / Column 7 → 6 (Naked Single)
  59. Row 7 / Column 7 → 2 (Full House)
  60. Row 8 / Column 5 → 7 (Full House)
  61. Row 7 / Column 4 → 4 (Naked Single)
  62. Row 5 / Column 5 → 3 (Naked Single)
  63. Row 3 / Column 4 → 1 (Naked Single)
  64. Row 7 / Column 6 → 6 (Naked Single)
  65. Row 7 / Column 5 → 5 (Full House)
  66. Row 1 / Column 5 → 6 (Full House)
  67. Row 5 / Column 6 → 2 (Naked Single)
  68. Row 5 / Column 4 → 7 (Full House)
  69. Row 9 / Column 4 → 2 (Full House)
  70. Row 9 / Column 6 → 1 (Full House)
  71. Row 3 / Column 9 → 6 (Naked Single)
  72. Row 3 / Column 6 → 4 (Full House)
  73. Row 1 / Column 6 → 3 (Full House)
  74. Row 1 / Column 9 → 1 (Full House)
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