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

This Sudoku Puzzle has 51 steps and it is solved using Locked Pair, Locked Candidates Type 1 (Pointing), Naked Pair, undefined, Continuous Nice Loop, Naked Single, Hidden Single, Locked Candidates Type 2 (Claiming), Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Locked Pair: 2,3 in r89c9 => r13c9,r7c78<>3
  2. Locked Candidates Type 1 (Pointing): 1 in b9 => r7c135<>1
  3. Locked Candidates Type 1 (Pointing): 4 in b9 => r7c5<>4
  4. Naked Pair: 2,3 in r9c29 => r9c156<>2, r9c156<>3
  5. XYZ-Wing: 2/3/8 in r17c3,r9c2 => r8c3<>3
  6. Continuous Nice Loop: 3/8 8= r6c2 =5= r6c7 -5- r2c7 =5= r2c4 -5- r1c4 -3- r1c3 -8- r3c2 =8= r6c2 =5 => r1c158,r6c2<>3, r1c1<>8
  7. Row 1 / Column 1 → 6 (Naked Single)
  8. Row 2 / Column 5 → 6 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 3 in b3 => r6c7<>3
  10. W-Wing: 2/3 in r2c1,r7c4 connected by 3 in r1c34 => r2c4,r7c1<>2
  11. Row 2 / Column 1 → 2 (Hidden Single)
  12. Row 7 / Column 4 → 2 (Hidden Single)
  13. Locked Candidates Type 2 (Claiming): 3 in c4 => r3c56<>3
  14. Naked Pair: 3,8 in r17c3 => r4c3<>3
  15. W-Wing: 3/1 in r5c1,r8c6 connected by 1 in r48c3 => r5c6<>3
  16. Row 8 / Column 6 → 3 (Hidden Single)
  17. Row 7 / Column 5 → 9 (Naked Single)
  18. Row 8 / Column 9 → 2 (Naked Single)
  19. Row 8 / Column 3 → 1 (Full House)
  20. Row 9 / Column 9 → 3 (Naked Single)
  21. Row 4 / Column 3 → 2 (Naked Single)
  22. Row 9 / Column 1 → 9 (Naked Single)
  23. Row 9 / Column 2 → 2 (Naked Single)
  24. Row 3 / Column 5 → 2 (Hidden Single)
  25. Row 3 / Column 6 → 4 (Naked Single)
  26. Row 1 / Column 5 → 7 (Naked Single)
  27. Row 3 / Column 7 → 3 (Naked Single)
  28. Row 9 / Column 6 → 1 (Naked Single)
  29. Row 5 / Column 6 → 2 (Full House)
  30. Row 9 / Column 5 → 4 (Full House)
  31. Row 1 / Column 9 → 8 (Naked Single)
  32. Row 3 / Column 9 → 7 (Full House)
  33. Row 3 / Column 2 → 8 (Full House)
  34. Row 1 / Column 3 → 3 (Full House)
  35. Row 7 / Column 3 → 8 (Full House)
  36. Row 7 / Column 1 → 3 (Full House)
  37. Row 2 / Column 7 → 5 (Naked Single)
  38. Row 1 / Column 8 → 4 (Full House)
  39. Row 1 / Column 4 → 5 (Full House)
  40. Row 2 / Column 4 → 3 (Full House)
  41. Row 6 / Column 2 → 5 (Naked Single)
  42. Row 5 / Column 2 → 3 (Full House)
  43. Row 5 / Column 1 → 1 (Naked Single)
  44. Row 5 / Column 8 → 5 (Full House)
  45. Row 6 / Column 1 → 8 (Full House)
  46. Row 6 / Column 7 → 1 (Naked Single)
  47. Row 4 / Column 8 → 3 (Full House)
  48. Row 7 / Column 8 → 1 (Full House)
  49. Row 6 / Column 5 → 3 (Full House)
  50. Row 7 / Column 7 → 4 (Full House)
  51. Row 4 / Column 5 → 1 (Full House)
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