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

This Sudoku Puzzle has 49 steps and it is solved using Locked Candidates Type 1 (Pointing), Empty Rectangle, undefined, Naked Pair, Hidden Single, Naked Single, Skyscraper, Full House techniques.

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

Solution Steps:

  1. Locked Candidates Type 1 (Pointing): 5 in b6 => r7c8<>5
  2. Empty Rectangle: 8 in b4 (r14c6) => r1c3<>8
  3. XY-Chain: 4 4- r2c1 -8- r2c7 -9- r9c7 -5- r9c1 -4 => r147c1<>4
  4. 2-String Kite: 4 in r2c1,r7c5 (connected by r7c3,r9c1) => r2c5<>4
  5. Locked Candidates Type 1 (Pointing): 4 in b2 => r1c23<>4
  6. 2-String Kite: 4 in r4c3,r9c6 (connected by r7c3,r9c1) => r4c6<>4
  7. Naked Pair: 8,9 in r4c6,r5c4 => r46c5,r6c4<>9, r6c4<>8
  8. Row 6 / Column 8 → 8 (Hidden Single)
  9. XY-Wing: 4/9/6 in r47c5,r7c8 => r4c8<>6
  10. XY-Chain: 9 9- r2c7 -8- r2c1 -4- r9c1 -5- r9c7 -9- r9c6 -4- r7c5 -9 => r2c5,r7c7<>9
  11. Row 2 / Column 5 → 1 (Naked Single)
  12. Skyscraper: 9 in r2c7,r6c9 (connected by r26c2) => r13c9<>9
  13. Row 6 / Column 9 → 9 (Hidden Single)
  14. Row 4 / Column 8 → 5 (Naked Single)
  15. Row 5 / Column 8 → 6 (Full House)
  16. Row 7 / Column 8 → 9 (Full House)
  17. Row 7 / Column 5 → 4 (Naked Single)
  18. Row 9 / Column 6 → 9 (Full House)
  19. Row 9 / Column 7 → 5 (Naked Single)
  20. Row 7 / Column 7 → 6 (Full House)
  21. Row 9 / Column 1 → 4 (Full House)
  22. Row 4 / Column 5 → 6 (Naked Single)
  23. Row 4 / Column 6 → 8 (Naked Single)
  24. Row 1 / Column 6 → 4 (Full House)
  25. Row 2 / Column 1 → 8 (Naked Single)
  26. Row 6 / Column 5 → 7 (Naked Single)
  27. Row 3 / Column 5 → 9 (Full House)
  28. Row 4 / Column 1 → 3 (Naked Single)
  29. Row 5 / Column 4 → 9 (Naked Single)
  30. Row 6 / Column 4 → 4 (Full House)
  31. Row 6 / Column 2 → 6 (Full House)
  32. Row 2 / Column 7 → 9 (Naked Single)
  33. Row 3 / Column 7 → 8 (Full House)
  34. Row 2 / Column 2 → 4 (Full House)
  35. Row 1 / Column 4 → 8 (Naked Single)
  36. Row 3 / Column 4 → 7 (Full House)
  37. Row 3 / Column 3 → 5 (Naked Single)
  38. Row 1 / Column 1 → 6 (Naked Single)
  39. Row 7 / Column 1 → 5 (Full House)
  40. Row 7 / Column 3 → 3 (Full House)
  41. Row 5 / Column 2 → 5 (Naked Single)
  42. Row 5 / Column 3 → 8 (Full House)
  43. Row 4 / Column 2 → 9 (Naked Single)
  44. Row 4 / Column 3 → 4 (Full House)
  45. Row 1 / Column 3 → 9 (Full House)
  46. Row 3 / Column 2 → 1 (Naked Single)
  47. Row 1 / Column 2 → 3 (Full House)
  48. Row 1 / Column 9 → 1 (Full House)
  49. Row 3 / Column 9 → 6 (Full House)
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