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

This Sudoku Puzzle has 70 steps and it is solved using Hidden Single, Naked Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Hidden Pair, Swordfish, undefined, Hidden Rectangle, Continuous Nice Loop, Naked Pair, Full House techniques.

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

Solution Steps:

  1. Row 1 / Column 4 → 8 (Hidden Single)
  2. Row 6 / Column 1 → 8 (Hidden Single)
  3. Row 8 / Column 9 → 3 (Hidden Single)
  4. Row 6 / Column 4 → 3 (Hidden Single)
  5. Row 3 / Column 4 → 7 (Naked Single)
  6. Row 2 / Column 4 → 6 (Naked Single)
  7. Row 8 / Column 6 → 8 (Hidden Single)
  8. Row 2 / Column 3 → 3 (Hidden Single)
  9. Row 3 / Column 5 → 3 (Hidden Single)
  10. Row 6 / Column 6 → 6 (Hidden Single)
  11. Row 5 / Column 1 → 3 (Hidden Single)
  12. Locked Candidates Type 1 (Pointing): 7 in b1 => r1c79<>7
  13. Locked Candidates Type 1 (Pointing): 2 in b6 => r5c6<>2
  14. Locked Candidates Type 2 (Claiming): 7 in r6 => r4c8,r5c79<>7
  15. Row 7 / Column 7 → 7 (Hidden Single)
  16. Row 8 / Column 5 → 7 (Hidden Single)
  17. Hidden Pair: 6,7 in r1c13 => r1c1<>2, r1c1<>5, r1c3<>1
  18. Swordfish: 4 r159 c379 => r47c3,r7c9<>4
  19. XYZ-Wing: 1/5/9 in r26c2,r3c3 => r1c2<>1
  20. Hidden Rectangle: 4/9 in r7c48,r8c48 => r7c4<>9
  21. Finned X-Wing: 1 c57 r15 fr3c7 => r1c9<>1
  22. Continuous Nice Loop: 4/5 9= r8c4 =2= r8c2 -2- r1c2 -5- r1c5 -1- r5c5 -9- r4c4 =9= r8c4 =2 => r8c4<>4, r1c79<>5
  23. Row 7 / Column 4 → 4 (Hidden Single)
  24. W-Wing: 1/5 in r2c6,r6c2 connected by 5 in r1c25 => r2c2<>1
  25. Row 3 / Column 3 → 1 (Hidden Single)
  26. X-Wing: 1 c57 r15 => r5c69<>1
  27. Row 5 / Column 6 → 7 (Naked Single)
  28. Naked Pair: 2,4 in r15c9 => r3c9<>2, r9c9<>4
  29. XY-Wing: 2/5/4 in r1c9,r39c7 => r1c7<>4
  30. Row 1 / Column 9 → 4 (Hidden Single)
  31. Row 5 / Column 9 → 2 (Naked Single)
  32. XY-Chain: 9 9- r4c4 -2- r8c4 -9- r8c8 -4- r9c7 -5- r3c7 -2- r1c7 -1- r5c7 -4- r5c3 -9 => r4c123,r5c5<>9
  33. Row 4 / Column 3 → 7 (Naked Single)
  34. Row 5 / Column 5 → 1 (Naked Single)
  35. Row 1 / Column 3 → 6 (Naked Single)
  36. Row 4 / Column 1 → 5 (Naked Single)
  37. Row 1 / Column 5 → 5 (Naked Single)
  38. Row 2 / Column 6 → 1 (Full House)
  39. Row 4 / Column 6 → 2 (Naked Single)
  40. Row 4 / Column 4 → 9 (Full House)
  41. Row 7 / Column 6 → 5 (Full House)
  42. Row 8 / Column 4 → 2 (Full House)
  43. Row 5 / Column 7 → 4 (Naked Single)
  44. Row 5 / Column 3 → 9 (Full House)
  45. Row 1 / Column 1 → 7 (Naked Single)
  46. Row 6 / Column 2 → 1 (Naked Single)
  47. Row 4 / Column 2 → 4 (Full House)
  48. Row 4 / Column 8 → 1 (Full House)
  49. Row 1 / Column 2 → 2 (Naked Single)
  50. Row 1 / Column 7 → 1 (Full House)
  51. Row 9 / Column 7 → 5 (Naked Single)
  52. Row 3 / Column 7 → 2 (Full House)
  53. Row 7 / Column 3 → 8 (Naked Single)
  54. Row 9 / Column 3 → 4 (Full House)
  55. Row 8 / Column 2 → 9 (Naked Single)
  56. Row 2 / Column 2 → 5 (Full House)
  57. Row 3 / Column 1 → 9 (Full House)
  58. Row 8 / Column 8 → 4 (Full House)
  59. Row 3 / Column 9 → 5 (Full House)
  60. Row 7 / Column 8 → 9 (Naked Single)
  61. Row 9 / Column 1 → 6 (Naked Single)
  62. Row 7 / Column 1 → 2 (Full House)
  63. Row 6 / Column 9 → 7 (Naked Single)
  64. Row 6 / Column 8 → 5 (Full House)
  65. Row 2 / Column 8 → 7 (Full House)
  66. Row 2 / Column 9 → 9 (Full House)
  67. Row 7 / Column 5 → 6 (Naked Single)
  68. Row 7 / Column 9 → 1 (Full House)
  69. Row 9 / Column 9 → 8 (Full House)
  70. Row 9 / Column 5 → 9 (Full House)
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