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

This Sudoku Puzzle has 53 steps and it is solved using Locked Pair, Naked Single, Locked Candidates Type 1 (Pointing), Hidden Single, undefined, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Locked Pair: 1,7 in r2c12 => r2c49,r3c123<>1, r2c479,r3c123<>7
  2. Row 2 / Column 7 → 8 (Naked Single)
  3. Locked Candidates Type 1 (Pointing): 6 in b1 => r3c56<>6
  4. Row 1 / Column 5 → 6 (Hidden Single)
  5. Locked Candidates Type 1 (Pointing): 9 in b1 => r3c79<>9
  6. X-Wing: 2 r15 c67 => r3c67,r4c6<>2
  7. Row 3 / Column 7 → 7 (Naked Single)
  8. W-Wing: 8/7 in r5c2,r9c6 connected by 7 in r8c24 => r5c6<>8
  9. XY-Wing: 2/7/8 in r19c6,r3c5 => r3c6,r9c5<>8
  10. Row 9 / Column 5 → 9 (Naked Single)
  11. Row 8 / Column 4 → 7 (Naked Single)
  12. Row 9 / Column 6 → 8 (Full House)
  13. Row 9 / Column 9 → 6 (Naked Single)
  14. Row 8 / Column 7 → 9 (Full House)
  15. Row 8 / Column 2 → 6 (Full House)
  16. Row 1 / Column 4 → 1 (Naked Single)
  17. Row 1 / Column 7 → 2 (Naked Single)
  18. Row 5 / Column 7 → 6 (Full House)
  19. Row 3 / Column 2 → 9 (Naked Single)
  20. Row 1 / Column 9 → 9 (Naked Single)
  21. Row 1 / Column 6 → 7 (Full House)
  22. Row 3 / Column 3 → 4 (Naked Single)
  23. Row 3 / Column 1 → 6 (Naked Single)
  24. Row 5 / Column 3 → 7 (Naked Single)
  25. Row 5 / Column 2 → 8 (Naked Single)
  26. Row 9 / Column 3 → 1 (Naked Single)
  27. Row 6 / Column 3 → 9 (Full House)
  28. Row 9 / Column 1 → 7 (Full House)
  29. Row 4 / Column 2 → 1 (Naked Single)
  30. Row 2 / Column 2 → 7 (Full House)
  31. Row 2 / Column 1 → 1 (Full House)
  32. Row 5 / Column 9 → 3 (Naked Single)
  33. Row 2 / Column 9 → 5 (Naked Single)
  34. Row 2 / Column 4 → 3 (Full House)
  35. Row 4 / Column 8 → 2 (Naked Single)
  36. Row 6 / Column 8 → 1 (Naked Single)
  37. Row 3 / Column 8 → 3 (Full House)
  38. Row 3 / Column 9 → 1 (Full House)
  39. Row 3 / Column 6 → 5 (Naked Single)
  40. Row 4 / Column 5 → 8 (Naked Single)
  41. Row 3 / Column 5 → 2 (Full House)
  42. Row 3 / Column 4 → 8 (Full House)
  43. Row 6 / Column 9 → 8 (Naked Single)
  44. Row 4 / Column 9 → 7 (Full House)
  45. Row 4 / Column 6 → 3 (Naked Single)
  46. Row 5 / Column 6 → 2 (Naked Single)
  47. Row 6 / Column 6 → 6 (Full House)
  48. Row 6 / Column 4 → 4 (Naked Single)
  49. Row 6 / Column 1 → 3 (Full House)
  50. Row 4 / Column 1 → 5 (Naked Single)
  51. Row 4 / Column 4 → 9 (Full House)
  52. Row 5 / Column 4 → 5 (Full House)
  53. Row 5 / Column 1 → 4 (Full House)
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