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

This Sudoku Puzzle has 65 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Single, Locked Pair, Full House, undefined, Empty Rectangle, Uniqueness Test 3 techniques.

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

Solution Steps:

  1. Row 2 / Column 4 → 8 (Hidden Single)
  2. Row 2 / Column 3 → 3 (Hidden Single)
  3. Row 9 / Column 2 → 2 (Hidden Single)
  4. Row 9 / Column 9 → 9 (Hidden Single)
  5. Locked Candidates Type 1 (Pointing): 8 in b6 => r78c7<>8
  6. Row 8 / Column 7 → 4 (Naked Single)
  7. Row 7 / Column 7 → 3 (Naked Single)
  8. Row 9 / Column 5 → 4 (Hidden Single)
  9. Row 9 / Column 4 → 6 (Hidden Single)
  10. Locked Pair: 2,8 in r46c7 => r2c7,r46c9<>2
  11. Row 6 / Column 9 → 5 (Naked Single)
  12. Row 8 / Column 9 → 7 (Naked Single)
  13. Row 2 / Column 9 → 2 (Naked Single)
  14. Row 8 / Column 1 → 1 (Naked Single)
  15. Row 8 / Column 5 → 5 (Naked Single)
  16. Row 9 / Column 8 → 8 (Naked Single)
  17. Row 7 / Column 8 → 5 (Full House)
  18. Row 9 / Column 6 → 7 (Full House)
  19. Row 7 / Column 4 → 1 (Naked Single)
  20. Row 7 / Column 6 → 8 (Full House)
  21. Row 2 / Column 8 → 1 (Hidden Single)
  22. Row 3 / Column 2 → 1 (Hidden Single)
  23. Row 6 / Column 6 → 1 (Hidden Single)
  24. Row 4 / Column 3 → 1 (Hidden Single)
  25. X-Wing: 3 r15 c48 => r3c48,r4c4<>3
  26. Empty Rectangle: 7 in b5 (r2c15) => r4c1<>7
  27. Uniqueness Test 3: 6/9 in r2c57,r3c57 => r6c5<>7
  28. Row 6 / Column 5 → 9 (Naked Single)
  29. Locked Candidates Type 1 (Pointing): 7 in b5 => r4c2<>7
  30. W-Wing: 9/7 in r2c1,r7c3 connected by 7 in r6c13 => r7c1<>9
  31. XYZ-Wing: 2/5/7 in r34c4,r5c6 => r5c4<>5
  32. XY-Chain: 6 6- r2c5 -7- r3c4 -5- r3c6 -9- r3c7 -6 => r2c7,r3c5<>6
  33. Row 2 / Column 7 → 9 (Naked Single)
  34. Row 2 / Column 1 → 7 (Naked Single)
  35. Row 1 / Column 2 → 9 (Full House)
  36. Row 2 / Column 5 → 6 (Full House)
  37. Row 3 / Column 7 → 6 (Naked Single)
  38. Row 6 / Column 1 → 2 (Naked Single)
  39. Row 7 / Column 1 → 4 (Naked Single)
  40. Row 1 / Column 6 → 2 (Naked Single)
  41. Row 6 / Column 7 → 8 (Naked Single)
  42. Row 4 / Column 7 → 2 (Full House)
  43. Row 6 / Column 3 → 7 (Full House)
  44. Row 4 / Column 1 → 5 (Naked Single)
  45. Row 5 / Column 1 → 9 (Full House)
  46. Row 7 / Column 2 → 7 (Naked Single)
  47. Row 7 / Column 3 → 9 (Full House)
  48. Row 5 / Column 6 → 5 (Naked Single)
  49. Row 3 / Column 6 → 9 (Full House)
  50. Row 4 / Column 4 → 7 (Naked Single)
  51. Row 5 / Column 3 → 6 (Naked Single)
  52. Row 8 / Column 3 → 8 (Full House)
  53. Row 8 / Column 2 → 6 (Full House)
  54. Row 1 / Column 4 → 3 (Naked Single)
  55. Row 1 / Column 8 → 7 (Full House)
  56. Row 3 / Column 4 → 5 (Naked Single)
  57. Row 3 / Column 5 → 7 (Full House)
  58. Row 4 / Column 5 → 3 (Full House)
  59. Row 5 / Column 4 → 2 (Full House)
  60. Row 5 / Column 2 → 4 (Naked Single)
  61. Row 4 / Column 2 → 8 (Full House)
  62. Row 4 / Column 9 → 4 (Full House)
  63. Row 5 / Column 8 → 3 (Full House)
  64. Row 3 / Column 8 → 4 (Full House)
  65. Row 3 / Column 9 → 3 (Full House)
Show More...