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

This Sudoku Puzzle has 69 steps and it is solved using Hidden Single, Naked Single, Locked Candidates Type 1 (Pointing), Hidden Rectangle, Finned Swordfish, Discontinuous Nice Loop, Grouped Discontinuous Nice Loop, undefined, Locked Pair, Full House techniques.

Naked Single Explanation
Hidden Single Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 6 / Column 1 → 7 (Hidden Single)
  2. Row 9 / Column 5 → 1 (Hidden Single)
  3. Row 2 / Column 3 → 7 (Hidden Single)
  4. Row 7 / Column 5 → 2 (Hidden Single)
  5. Row 6 / Column 5 → 4 (Naked Single)
  6. Row 4 / Column 5 → 7 (Hidden Single)
  7. Locked Candidates Type 1 (Pointing): 9 in b3 => r789c7<>9
  8. Locked Candidates Type 1 (Pointing): 1 in b4 => r5c4<>1
  9. Locked Candidates Type 1 (Pointing): 3 in b4 => r13c2<>3
  10. Locked Candidates Type 1 (Pointing): 8 in b7 => r12c1<>8
  11. Hidden Rectangle: 3/6 in r1c15,r3c15 => r3c1<>6
  12. Finned Swordfish: 6 r248 c268 fr2c1 => r13c2<>6
  13. Discontinuous Nice Loop: 6 r2c8 -6- r2c1 -5- r7c1 =5= r8c2 =6= r8c8 -6- r2c8 => r2c8<>6
  14. Locked Candidates Type 1 (Pointing): 6 in b3 => r9c9<>6
  15. Grouped Discontinuous Nice Loop: 4 r8c8 -4- r8c46 =4= r7c6 -4- r7c3 -9- r9c13 =9= r9c8 =6= r8c8 => r8c8<>4
  16. Almost Locked Set XZ-Rule: A=r7c36 {479}, B=r7c89,r89c8,r9c79 {2346789}, X=7, Z=4 => r7c7<>4
  17. Almost Locked Set XZ-Rule: A=r7c36 {479}, B=r79c9,r89c8,r9c7 {246789}, X=7, Z=4,9 => r7c8<>4, r7c8<>9
  18. Row 7 / Column 8 → 3 (Naked Single)
  19. Row 6 / Column 2 → 3 (Hidden Single)
  20. Row 4 / Column 7 → 3 (Hidden Single)
  21. Locked Pair: 1,2 in r46c8 => r29c8,r5c79<>2
  22. Row 2 / Column 8 → 4 (Naked Single)
  23. Row 2 / Column 2 → 2 (Hidden Single)
  24. Row 4 / Column 2 → 6 (Naked Single)
  25. Row 5 / Column 2 → 9 (Naked Single)
  26. Row 5 / Column 1 → 1 (Naked Single)
  27. Row 5 / Column 3 → 2 (Full House)
  28. Row 1 / Column 2 → 8 (Hidden Single)
  29. Row 5 / Column 5 → 6 (Hidden Single)
  30. Row 1 / Column 5 → 3 (Naked Single)
  31. Row 3 / Column 5 → 5 (Full House)
  32. Row 2 / Column 4 → 8 (Naked Single)
  33. Row 3 / Column 2 → 4 (Naked Single)
  34. Row 8 / Column 2 → 5 (Full House)
  35. Row 2 / Column 6 → 6 (Naked Single)
  36. Row 2 / Column 1 → 5 (Full House)
  37. Row 5 / Column 4 → 5 (Naked Single)
  38. Row 3 / Column 4 → 1 (Naked Single)
  39. Row 1 / Column 6 → 4 (Full House)
  40. Row 4 / Column 4 → 2 (Naked Single)
  41. Row 4 / Column 8 → 1 (Naked Single)
  42. Row 4 / Column 6 → 8 (Full House)
  43. Row 6 / Column 4 → 9 (Naked Single)
  44. Row 6 / Column 6 → 1 (Full House)
  45. Row 6 / Column 8 → 2 (Full House)
  46. Row 8 / Column 4 → 4 (Full House)
  47. Row 8 / Column 7 → 7 (Naked Single)
  48. Row 3 / Column 7 → 9 (Naked Single)
  49. Row 8 / Column 6 → 9 (Naked Single)
  50. Row 7 / Column 6 → 7 (Full House)
  51. Row 8 / Column 8 → 6 (Full House)
  52. Row 9 / Column 8 → 9 (Full House)
  53. Row 1 / Column 7 → 2 (Naked Single)
  54. Row 3 / Column 1 → 3 (Naked Single)
  55. Row 3 / Column 3 → 6 (Naked Single)
  56. Row 3 / Column 9 → 7 (Full House)
  57. Row 1 / Column 9 → 6 (Full House)
  58. Row 1 / Column 1 → 9 (Naked Single)
  59. Row 1 / Column 3 → 1 (Full House)
  60. Row 9 / Column 3 → 4 (Naked Single)
  61. Row 7 / Column 3 → 9 (Full House)
  62. Row 7 / Column 1 → 8 (Naked Single)
  63. Row 9 / Column 1 → 6 (Full House)
  64. Row 9 / Column 7 → 8 (Naked Single)
  65. Row 9 / Column 9 → 2 (Full House)
  66. Row 7 / Column 7 → 5 (Naked Single)
  67. Row 7 / Column 9 → 4 (Full House)
  68. Row 5 / Column 7 → 4 (Full House)
  69. Row 5 / Column 9 → 8 (Full House)
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