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.

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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