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

This Sudoku Puzzle has 66 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Hidden Pair, undefined, Swordfish, Hidden Rectangle, Discontinuous Nice Loop, Naked Single, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 4 / Column 6 → 9 (Hidden Single)
  2. Row 8 / Column 8 → 4 (Hidden Single)
  3. Locked Candidates Type 1 (Pointing): 9 in b3 => r3c12<>9
  4. Row 2 / Column 2 → 9 (Hidden Single)
  5. Locked Candidates Type 1 (Pointing): 2 in b6 => r789c7<>2
  6. Locked Candidates Type 2 (Claiming): 4 in c2 => r1c13,r3c13<>4
  7. Hidden Pair: 2,8 in r46c7 => r46c7<>1, r46c7<>3, r6c7<>5, r6c7<>7
  8. Locked Candidates Type 1 (Pointing): 3 in b6 => r237c8<>3
  9. X-Wing: 5 r26 c48 => r3c48<>5
  10. Swordfish: 2 c359 r379 => r3c146,r7c16,r9c14<>2
  11. Hidden Rectangle: 1/4 in r5c13,r9c13 => r9c1<>1
  12. Discontinuous Nice Loop: 1/3/5/8 r3c3 =2= r3c5 -2- r9c5 -6- r5c5 -5- r6c4 =5= r2c4 =3= r2c1 =2= r3c3 => r3c3<>1, r3c3<>3, r3c3<>5, r3c3<>8
  13. Row 3 / Column 3 → 2 (Naked Single)
  14. Row 1 / Column 3 → 5 (Hidden Single)
  15. Row 8 / Column 1 → 2 (Hidden Single)
  16. Row 4 / Column 3 → 3 (Hidden Single)
  17. Row 4 / Column 8 → 1 (Naked Single)
  18. Row 5 / Column 9 → 7 (Naked Single)
  19. Row 5 / Column 7 → 5 (Naked Single)
  20. Row 5 / Column 5 → 6 (Naked Single)
  21. Row 6 / Column 8 → 3 (Naked Single)
  22. Row 4 / Column 4 → 2 (Naked Single)
  23. Row 9 / Column 5 → 2 (Naked Single)
  24. Row 4 / Column 7 → 8 (Naked Single)
  25. Row 4 / Column 2 → 6 (Full House)
  26. Row 6 / Column 7 → 2 (Full House)
  27. Row 6 / Column 6 → 1 (Naked Single)
  28. Row 6 / Column 4 → 5 (Full House)
  29. Row 7 / Column 3 → 8 (Hidden Single)
  30. Row 7 / Column 5 → 3 (Naked Single)
  31. Row 8 / Column 2 → 1 (Naked Single)
  32. Row 1 / Column 5 → 8 (Naked Single)
  33. Row 3 / Column 5 → 5 (Full House)
  34. Row 8 / Column 4 → 6 (Naked Single)
  35. Row 9 / Column 3 → 4 (Naked Single)
  36. Row 5 / Column 3 → 1 (Full House)
  37. Row 5 / Column 1 → 4 (Full House)
  38. Row 7 / Column 6 → 7 (Naked Single)
  39. Row 8 / Column 6 → 8 (Naked Single)
  40. Row 8 / Column 7 → 3 (Full House)
  41. Row 9 / Column 4 → 1 (Full House)
  42. Row 2 / Column 6 → 2 (Naked Single)
  43. Row 7 / Column 8 → 6 (Naked Single)
  44. Row 9 / Column 9 → 9 (Naked Single)
  45. Row 3 / Column 8 → 7 (Naked Single)
  46. Row 2 / Column 8 → 5 (Full House)
  47. Row 7 / Column 1 → 9 (Naked Single)
  48. Row 9 / Column 1 → 6 (Full House)
  49. Row 9 / Column 7 → 7 (Full House)
  50. Row 7 / Column 7 → 1 (Naked Single)
  51. Row 7 / Column 9 → 2 (Full House)
  52. Row 3 / Column 4 → 3 (Naked Single)
  53. Row 2 / Column 4 → 7 (Full House)
  54. Row 2 / Column 1 → 3 (Full House)
  55. Row 1 / Column 7 → 6 (Naked Single)
  56. Row 3 / Column 7 → 9 (Full House)
  57. Row 3 / Column 9 → 1 (Naked Single)
  58. Row 1 / Column 9 → 3 (Full House)
  59. Row 1 / Column 6 → 4 (Naked Single)
  60. Row 3 / Column 6 → 6 (Full House)
  61. Row 3 / Column 1 → 8 (Naked Single)
  62. Row 3 / Column 2 → 4 (Full House)
  63. Row 1 / Column 2 → 7 (Naked Single)
  64. Row 1 / Column 1 → 1 (Full House)
  65. Row 6 / Column 1 → 7 (Full House)
  66. Row 6 / Column 2 → 8 (Full House)
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