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

This Sudoku Puzzle has 65 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Swordfish, Naked Pair, undefined, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 6 / Column 4 → 2 (Naked Single)
  2. Row 9 / Column 1 → 6 (Hidden Single)
  3. Row 4 / Column 8 → 2 (Hidden Single)
  4. Locked Candidates Type 1 (Pointing): 8 in b4 => r4c7<>8
  5. Locked Candidates Type 1 (Pointing): 6 in b5 => r4c7<>6
  6. Locked Candidates Type 2 (Claiming): 4 in c8 => r7c79,r89c7,r9c9<>4
  7. Naked Triple: 3,4,9 in r459c5 => r137c5<>4, r17c5<>9, r7c5<>3
  8. Row 7 / Column 5 → 8 (Naked Single)
  9. Locked Candidates Type 1 (Pointing): 4 in b2 => r478c6<>4
  10. Row 7 / Column 2 → 4 (Hidden Single)
  11. Row 1 / Column 2 → 2 (Hidden Single)
  12. Row 1 / Column 5 → 7 (Naked Single)
  13. Row 3 / Column 5 → 2 (Naked Single)
  14. Locked Candidates Type 2 (Claiming): 8 in c9 => r13c7,r2c8<>8
  15. Row 2 / Column 8 → 7 (Naked Single)
  16. Row 9 / Column 8 → 4 (Naked Single)
  17. Row 3 / Column 3 → 7 (Hidden Single)
  18. Row 9 / Column 9 → 7 (Hidden Single)
  19. Row 8 / Column 4 → 4 (Hidden Single)
  20. Swordfish: 1 c268 r468 => r4c137,r68c7,r8c3<>1
  21. Naked Pair: 5,8 in r4c13 => r4c2<>5
  22. XY-Chain: 4 4- r4c7 -7- r6c7 -8- r6c8 -1- r6c6 -3- r5c5 -4 => r4c5,r5c79<>4
  23. Row 4 / Column 5 → 9 (Naked Single)
  24. Row 4 / Column 4 → 6 (Naked Single)
  25. Row 2 / Column 4 → 9 (Full House)
  26. Row 9 / Column 5 → 3 (Naked Single)
  27. Row 5 / Column 5 → 4 (Full House)
  28. Row 4 / Column 6 → 1 (Naked Single)
  29. Row 6 / Column 6 → 3 (Full House)
  30. Row 4 / Column 2 → 7 (Naked Single)
  31. Row 4 / Column 7 → 4 (Naked Single)
  32. Row 6 / Column 2 → 1 (Naked Single)
  33. Row 6 / Column 8 → 8 (Naked Single)
  34. Row 6 / Column 7 → 7 (Full House)
  35. Row 8 / Column 8 → 1 (Full House)
  36. Row 7 / Column 9 → 5 (Naked Single)
  37. Row 7 / Column 6 → 9 (Naked Single)
  38. Row 8 / Column 6 → 5 (Full House)
  39. Row 9 / Column 7 → 9 (Naked Single)
  40. Row 9 / Column 3 → 5 (Full House)
  41. Row 7 / Column 7 → 3 (Naked Single)
  42. Row 8 / Column 7 → 8 (Full House)
  43. Row 8 / Column 2 → 3 (Naked Single)
  44. Row 2 / Column 2 → 5 (Full House)
  45. Row 8 / Column 3 → 9 (Full House)
  46. Row 4 / Column 3 → 8 (Naked Single)
  47. Row 4 / Column 1 → 5 (Full House)
  48. Row 1 / Column 3 → 1 (Naked Single)
  49. Row 1 / Column 7 → 6 (Naked Single)
  50. Row 3 / Column 1 → 8 (Naked Single)
  51. Row 7 / Column 3 → 2 (Naked Single)
  52. Row 5 / Column 3 → 3 (Full House)
  53. Row 7 / Column 1 → 1 (Full House)
  54. Row 5 / Column 1 → 2 (Full House)
  55. Row 2 / Column 9 → 8 (Naked Single)
  56. Row 5 / Column 7 → 1 (Naked Single)
  57. Row 3 / Column 7 → 5 (Full House)
  58. Row 5 / Column 9 → 6 (Full House)
  59. Row 1 / Column 1 → 9 (Naked Single)
  60. Row 2 / Column 1 → 3 (Full House)
  61. Row 2 / Column 6 → 6 (Full House)
  62. Row 3 / Column 6 → 4 (Naked Single)
  63. Row 1 / Column 6 → 8 (Full House)
  64. Row 1 / Column 9 → 4 (Full House)
  65. Row 3 / Column 9 → 1 (Full House)
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