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

This Sudoku Puzzle has 74 steps and it is solved using Naked Single, Hidden Single, Locked Pair, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Hidden Pair, Empty Rectangle, undefined, AIC, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 2 / Column 9 → 7 (Naked Single)
  2. Row 2 / Column 3 → 6 (Naked Single)
  3. Row 6 / Column 3 → 7 (Naked Single)
  4. Row 8 / Column 3 → 9 (Hidden Single)
  5. Locked Pair: 2,8 in r2c12 => r2c5,r3c12<>8, r1c2<>2
  6. Locked Candidates Type 1 (Pointing): 5 in b7 => r45c2<>5
  7. Locked Candidates Type 2 (Claiming): 1 in c3 => r4c12,r5c2<>1
  8. Locked Candidates Type 2 (Claiming): 9 in c9 => r4c78,r6c78<>9
  9. Naked Triple: 6,7,8 in r5c246 => r5c8<>6, r5c8<>7
  10. Row 4 / Column 8 → 7 (Hidden Single)
  11. Hidden Pair: 2,6 in r1c46 => r1c46<>4, r1c46<>7
  12. Locked Candidates Type 1 (Pointing): 4 in b2 => r4689c5<>4
  13. Locked Candidates Type 1 (Pointing): 4 in b5 => r4c12<>4
  14. Empty Rectangle: 1 in b1 (r7c28) => r3c8<>1
  15. Locked Candidates Type 1 (Pointing): 1 in b3 => r1c2<>1
  16. XYZ-Wing: 2/6/8 in r24c1,r5c2 => r6c1<>8
  17. AIC: 1 1- r8c7 -2- r7c8 =2= r6c8 =6= r9c8 -6- r8c9 -1 => r79c8,r8c125,r9c7<>1
  18. Row 7 / Column 2 → 1 (Hidden Single)
  19. Row 9 / Column 5 → 1 (Hidden Single)
  20. Row 3 / Column 1 → 1 (Hidden Single)
  21. Row 7 / Column 4 → 5 (Hidden Single)
  22. Row 8 / Column 5 → 7 (Naked Single)
  23. Row 1 / Column 5 → 4 (Naked Single)
  24. Row 8 / Column 2 → 5 (Hidden Single)
  25. Row 1 / Column 4 → 2 (Hidden Single)
  26. Row 1 / Column 6 → 6 (Naked Single)
  27. Row 1 / Column 2 → 7 (Hidden Single)
  28. Row 3 / Column 2 → 9 (Naked Single)
  29. Row 9 / Column 1 → 7 (Hidden Single)
  30. Row 2 / Column 8 → 4 (Hidden Single)
  31. Locked Candidates Type 1 (Pointing): 9 in b8 => r4c6<>9
  32. 2-String Kite: 6 in r6c8,r8c1 (connected by r8c9,r9c8) => r6c1<>6
  33. W-Wing: 7/8 in r3c4,r5c6 connected by 8 in r9c46 => r3c6,r5c4<>7
  34. Row 3 / Column 4 → 7 (Hidden Single)
  35. Row 5 / Column 6 → 7 (Hidden Single)
  36. XY-Wing: 1/2/9 in r18c7,r7c8 => r1c8,r9c7<>9
  37. Row 1 / Column 8 → 1 (Naked Single)
  38. Row 1 / Column 7 → 9 (Full House)
  39. Row 9 / Column 7 → 3 (Naked Single)
  40. Row 5 / Column 8 → 5 (Naked Single)
  41. Row 2 / Column 7 → 5 (Naked Single)
  42. Row 3 / Column 8 → 3 (Full House)
  43. Row 5 / Column 3 → 1 (Naked Single)
  44. Row 4 / Column 3 → 5 (Full House)
  45. Row 2 / Column 5 → 3 (Naked Single)
  46. Row 3 / Column 6 → 8 (Naked Single)
  47. Row 3 / Column 5 → 5 (Full House)
  48. Row 4 / Column 6 → 3 (Hidden Single)
  49. Row 6 / Column 2 → 3 (Hidden Single)
  50. Row 9 / Column 4 → 8 (Hidden Single)
  51. Row 5 / Column 4 → 6 (Naked Single)
  52. Row 4 / Column 4 → 4 (Full House)
  53. Row 5 / Column 2 → 8 (Full House)
  54. Row 2 / Column 2 → 2 (Naked Single)
  55. Row 2 / Column 1 → 8 (Full House)
  56. Row 4 / Column 2 → 6 (Naked Single)
  57. Row 9 / Column 2 → 4 (Full House)
  58. Row 8 / Column 1 → 6 (Full House)
  59. Row 4 / Column 1 → 2 (Naked Single)
  60. Row 6 / Column 1 → 4 (Full House)
  61. Row 9 / Column 6 → 9 (Naked Single)
  62. Row 9 / Column 8 → 6 (Full House)
  63. Row 8 / Column 9 → 1 (Naked Single)
  64. Row 7 / Column 6 → 2 (Naked Single)
  65. Row 7 / Column 8 → 9 (Full House)
  66. Row 6 / Column 8 → 2 (Full House)
  67. Row 8 / Column 7 → 2 (Full House)
  68. Row 8 / Column 6 → 4 (Full House)
  69. Row 4 / Column 9 → 9 (Naked Single)
  70. Row 6 / Column 9 → 6 (Full House)
  71. Row 6 / Column 7 → 8 (Naked Single)
  72. Row 4 / Column 7 → 1 (Full House)
  73. Row 4 / Column 5 → 8 (Full House)
  74. Row 6 / Column 5 → 9 (Full House)
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