1
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9
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8
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9

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.

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 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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