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

This Sudoku Puzzle has 45 steps and it is solved using Locked Candidates Type 2 (Claiming), Naked Triple, Skyscraper, Naked Single, Full House, Empty Rectangle, Naked Pair, Turbot Fish, undefined, Hidden Single techniques.

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

Solution Steps:

  1. Locked Candidates Type 2 (Claiming): 6 in c7 => r456c9,r6c8<>6
  2. Naked Triple: 3,6,8 in r6c268 => r6c19<>3, r6c1<>6, r6c19<>8
  3. Skyscraper: 5 in r7c9,r9c4 (connected by r1c49) => r7c5,r9c8<>5
  4. Row 7 / Column 5 → 6 (Naked Single)
  5. Row 7 / Column 9 → 5 (Full House)
  6. Row 9 / Column 8 → 6 (Full House)
  7. Skyscraper: 6 in r2c1,r6c2 (connected by r26c6) => r1c2,r45c1<>6
  8. Empty Rectangle: 8 in b6 (r3c69) => r6c6<>8
  9. Naked Pair: 3,6 in r4c4,r6c6 => r4c56,r5c56<>3, r45c6<>6
  10. Turbot Fish: 8 r2c1 =8= r1c2 -8- r6c2 =8= r6c8 => r2c8<>8
  11. W-Wing: 3/6 in r3c3,r6c6 connected by 6 in r2c16 => r3c6<>3
  12. XYZ-Wing: 3/5/8 in r1c28,r2c8 => r1c9<>3
  13. XY-Wing: 3/8/6 in r1c29,r3c3 => r3c9<>6
  14. Row 1 / Column 9 → 6 (Hidden Single)
  15. Row 4 / Column 4 → 6 (Hidden Single)
  16. Row 4 / Column 7 → 4 (Naked Single)
  17. Row 5 / Column 7 → 6 (Full House)
  18. Row 6 / Column 6 → 3 (Naked Single)
  19. Row 4 / Column 6 → 8 (Naked Single)
  20. Row 6 / Column 8 → 8 (Naked Single)
  21. Row 3 / Column 6 → 6 (Naked Single)
  22. Row 4 / Column 5 → 1 (Naked Single)
  23. Row 6 / Column 2 → 6 (Naked Single)
  24. Row 2 / Column 6 → 5 (Naked Single)
  25. Row 5 / Column 6 → 4 (Full House)
  26. Row 5 / Column 5 → 5 (Full House)
  27. Row 3 / Column 3 → 3 (Naked Single)
  28. Row 3 / Column 9 → 8 (Full House)
  29. Row 8 / Column 3 → 6 (Full House)
  30. Row 8 / Column 1 → 3 (Full House)
  31. Row 1 / Column 4 → 3 (Naked Single)
  32. Row 2 / Column 5 → 8 (Full House)
  33. Row 9 / Column 5 → 3 (Full House)
  34. Row 9 / Column 4 → 5 (Full House)
  35. Row 2 / Column 8 → 3 (Naked Single)
  36. Row 1 / Column 8 → 5 (Full House)
  37. Row 1 / Column 2 → 8 (Full House)
  38. Row 2 / Column 1 → 6 (Full House)
  39. Row 5 / Column 2 → 3 (Full House)
  40. Row 4 / Column 1 → 9 (Naked Single)
  41. Row 4 / Column 9 → 3 (Full House)
  42. Row 5 / Column 9 → 1 (Naked Single)
  43. Row 5 / Column 1 → 8 (Full House)
  44. Row 6 / Column 1 → 1 (Full House)
  45. Row 6 / Column 9 → 9 (Full House)
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