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

This Sudoku Puzzle has 71 steps and it is solved using Hidden Single, Locked Candidates Type 2 (Claiming), Locked Pair, Naked Single, Naked Pair, Naked Triple, Locked Candidates Type 1 (Pointing), Skyscraper, undefined, Full House, Hidden Rectangle, Sashimi Swordfish techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 3 / Column 7 → 7 (Hidden Single)
  2. Row 9 / Column 6 → 7 (Hidden Single)
  3. Row 8 / Column 4 → 4 (Hidden Single)
  4. Row 6 / Column 8 → 4 (Hidden Single)
  5. Row 5 / Column 8 → 7 (Hidden Single)
  6. Locked Candidates Type 2 (Claiming): 8 in c1 => r1c23,r2c2,r3c3<>8
  7. Row 2 / Column 9 → 8 (Hidden Single)
  8. Locked Pair: 2,3 in r1c23 => r1c1579,r2c2,r3c13<>2, r1c5,r2c2<>3
  9. Row 2 / Column 2 → 9 (Naked Single)
  10. Row 3 / Column 3 → 5 (Naked Single)
  11. Row 8 / Column 8 → 5 (Hidden Single)
  12. Row 4 / Column 4 → 5 (Hidden Single)
  13. Row 6 / Column 9 → 5 (Hidden Single)
  14. Row 4 / Column 6 → 9 (Hidden Single)
  15. Row 3 / Column 4 → 9 (Hidden Single)
  16. Locked Candidates Type 2 (Claiming): 6 in r4 => r5c1,r6c2<>6
  17. Naked Pair: 2,6 in r38c6 => r26c6<>2, r6c6<>6
  18. Naked Triple: 1,2,6 in r4c12,r5c1 => r56c3<>1, r56c3,r6c2<>2
  19. Row 5 / Column 3 → 3 (Naked Single)
  20. Row 1 / Column 3 → 2 (Naked Single)
  21. Row 1 / Column 2 → 3 (Naked Single)
  22. Locked Candidates Type 1 (Pointing): 1 in b4 => r9c1<>1
  23. Skyscraper: 1 in r4c8,r6c6 (connected by r2c68) => r6c7<>1
  24. Locked Candidates Type 2 (Claiming): 1 in r6 => r5c5<>1
  25. W-Wing: 2/6 in r5c5,r8c6 connected by 6 in r69c4 => r79c5<>2
  26. W-Wing: 2/6 in r6c7,r8c6 connected by 6 in r69c4 => r8c7<>2
  27. Row 8 / Column 7 → 1 (Naked Single)
  28. Row 8 / Column 3 → 8 (Naked Single)
  29. Row 6 / Column 3 → 7 (Naked Single)
  30. Row 6 / Column 2 → 8 (Naked Single)
  31. Row 7 / Column 3 → 9 (Naked Single)
  32. Row 9 / Column 3 → 1 (Full House)
  33. Row 7 / Column 2 → 7 (Hidden Single)
  34. XYZ-Wing: 2/4/6 in r1c7,r37c9 => r1c9<>4
  35. Hidden Rectangle: 2/9 in r5c79,r9c79 => r5c7<>2
  36. Sashimi Swordfish: 2 c268 r248 fr3c6 => r2c4<>2
  37. Row 2 / Column 4 → 3 (Naked Single)
  38. Row 2 / Column 6 → 1 (Naked Single)
  39. Row 2 / Column 8 → 2 (Full House)
  40. Row 4 / Column 8 → 1 (Full House)
  41. Row 6 / Column 6 → 3 (Naked Single)
  42. Row 1 / Column 9 → 1 (Hidden Single)
  43. Row 6 / Column 5 → 1 (Hidden Single)
  44. Row 5 / Column 1 → 1 (Hidden Single)
  45. Naked Pair: 2,6 in r8c6,r9c4 => r9c5<>6
  46. Skyscraper: 6 in r1c5,r6c4 (connected by r16c7) => r5c5<>6
  47. Row 5 / Column 5 → 2 (Naked Single)
  48. Row 6 / Column 4 → 6 (Full House)
  49. Row 6 / Column 7 → 2 (Full House)
  50. Row 9 / Column 4 → 2 (Full House)
  51. Row 8 / Column 6 → 6 (Naked Single)
  52. Row 3 / Column 6 → 2 (Full House)
  53. Row 8 / Column 2 → 2 (Full House)
  54. Row 4 / Column 2 → 6 (Full House)
  55. Row 4 / Column 1 → 2 (Full House)
  56. Row 9 / Column 9 → 9 (Naked Single)
  57. Row 7 / Column 1 → 5 (Naked Single)
  58. Row 9 / Column 1 → 6 (Full House)
  59. Row 5 / Column 9 → 6 (Naked Single)
  60. Row 5 / Column 7 → 9 (Full House)
  61. Row 9 / Column 7 → 3 (Naked Single)
  62. Row 9 / Column 5 → 5 (Full House)
  63. Row 7 / Column 5 → 3 (Full House)
  64. Row 3 / Column 9 → 4 (Naked Single)
  65. Row 1 / Column 7 → 6 (Full House)
  66. Row 7 / Column 7 → 4 (Full House)
  67. Row 7 / Column 9 → 2 (Full House)
  68. Row 3 / Column 1 → 8 (Naked Single)
  69. Row 1 / Column 1 → 4 (Full House)
  70. Row 1 / Column 5 → 8 (Full House)
  71. Row 3 / Column 5 → 6 (Full House)
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