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

This Sudoku Puzzle has 75 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Pair, undefined, Finned Swordfish, Discontinuous Nice Loop, Naked Single, Full House, Empty Rectangle, Grouped AIC 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 4 / Column 7 → 1 (Hidden Single)
  2. Row 3 / Column 1 → 2 (Hidden Single)
  3. Row 2 / Column 3 → 1 (Hidden Single)
  4. Row 1 / Column 6 → 1 (Hidden Single)
  5. Row 7 / Column 8 → 1 (Hidden Single)
  6. Row 8 / Column 2 → 1 (Hidden Single)
  7. Row 1 / Column 3 → 9 (Hidden Single)
  8. Row 7 / Column 9 → 9 (Hidden Single)
  9. Row 4 / Column 5 → 9 (Hidden Single)
  10. Row 2 / Column 7 → 9 (Hidden Single)
  11. Row 3 / Column 6 → 9 (Hidden Single)
  12. Row 5 / Column 8 → 9 (Hidden Single)
  13. Row 6 / Column 8 → 3 (Hidden Single)
  14. Row 1 / Column 8 → 6 (Hidden Single)
  15. Locked Candidates Type 1 (Pointing): 5 in b2 => r79c4<>5
  16. Locked Candidates Type 1 (Pointing): 7 in b3 => r3c45<>7
  17. Locked Candidates Type 1 (Pointing): 7 in b4 => r89c3<>7
  18. Locked Candidates Type 1 (Pointing): 4 in b9 => r9c23<>4
  19. Locked Candidates Type 2 (Claiming): 4 in c3 => r46c1,r5c2<>4
  20. Naked Pair: 3,6 in r4c1,r5c2 => r45c3<>3, r6c1<>6
  21. Row 8 / Column 3 → 3 (Hidden Single)
  22. X-Wing: 6 r59 c24 => r4c4<>6
  23. 2-String Kite: 3 in r3c2,r4c4 (connected by r4c1,r5c2) => r3c4<>3
  24. Finned Swordfish: 8 r359 c347 fr3c5 => r1c4<>8
  25. Discontinuous Nice Loop: 4/7/8 r6c3 =5= r6c1 -5- r8c1 -6- r8c5 =6= r9c4 =8= r9c3 =5= r6c3 => r6c3<>4, r6c3<>7, r6c3<>8
  26. Row 6 / Column 3 → 5 (Naked Single)
  27. Row 6 / Column 1 → 8 (Naked Single)
  28. Row 9 / Column 3 → 8 (Naked Single)
  29. Row 5 / Column 3 → 4 (Naked Single)
  30. Row 4 / Column 3 → 7 (Full House)
  31. Row 5 / Column 7 → 8 (Hidden Single)
  32. Row 1 / Column 9 → 8 (Hidden Single)
  33. Locked Candidates Type 1 (Pointing): 2 in b6 => r6c56<>2
  34. Row 6 / Column 6 → 7 (Naked Single)
  35. Empty Rectangle: 4 in b3 (r4c49) => r3c4<>4
  36. Grouped AIC: 3/6 3- r4c1 -6- r8c1 -5- r7c12 =5= r7c6 =3= r5c6 -3- r5c2 -6 => r5c2<>3, r4c1<>6
  37. Row 5 / Column 2 → 6 (Naked Single)
  38. Row 4 / Column 1 → 3 (Full House)
  39. Row 4 / Column 4 → 4 (Naked Single)
  40. Row 4 / Column 9 → 6 (Full House)
  41. Row 6 / Column 5 → 6 (Naked Single)
  42. Row 3 / Column 2 → 3 (Hidden Single)
  43. Row 8 / Column 1 → 6 (Hidden Single)
  44. Row 9 / Column 4 → 6 (Hidden Single)
  45. Locked Candidates Type 2 (Claiming): 5 in r8 => r9c7<>5
  46. Naked Pair: 4,5 in r2c19 => r2c4<>5, r2c5<>4
  47. XY-Chain: 7 7- r2c4 -3- r5c4 -2- r5c6 -3- r7c6 -5- r9c6 -2- r8c5 -7 => r2c5,r7c4<>7
  48. Row 2 / Column 5 → 3 (Naked Single)
  49. Row 2 / Column 4 → 7 (Naked Single)
  50. XY-Chain: 4 4- r2c9 -5- r8c9 -2- r8c5 -7- r7c5 -8- r3c5 -4 => r3c78<>4
  51. Row 3 / Column 8 → 7 (Naked Single)
  52. Row 9 / Column 8 → 4 (Full House)
  53. Row 3 / Column 7 → 5 (Naked Single)
  54. Row 2 / Column 9 → 4 (Full House)
  55. Row 2 / Column 1 → 5 (Full House)
  56. Row 1 / Column 2 → 4 (Full House)
  57. Row 7 / Column 1 → 4 (Full House)
  58. Row 3 / Column 4 → 8 (Naked Single)
  59. Row 3 / Column 5 → 4 (Full House)
  60. Row 6 / Column 9 → 2 (Naked Single)
  61. Row 6 / Column 7 → 4 (Full House)
  62. Row 8 / Column 9 → 5 (Full House)
  63. Row 1 / Column 5 → 2 (Naked Single)
  64. Row 1 / Column 4 → 5 (Full House)
  65. Row 7 / Column 4 → 3 (Naked Single)
  66. Row 5 / Column 4 → 2 (Full House)
  67. Row 5 / Column 6 → 3 (Full House)
  68. Row 8 / Column 5 → 7 (Naked Single)
  69. Row 7 / Column 5 → 8 (Full House)
  70. Row 8 / Column 7 → 2 (Full House)
  71. Row 9 / Column 7 → 7 (Full House)
  72. Row 7 / Column 6 → 5 (Naked Single)
  73. Row 7 / Column 2 → 7 (Full House)
  74. Row 9 / Column 2 → 5 (Full House)
  75. Row 9 / Column 6 → 2 (Full House)
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