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

This Sudoku Puzzle has 66 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Pair, Naked Single, Hidden Pair, undefined, Sashimi Swordfish, Full House techniques.

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

Solution Steps:

  1. Row 1 / Column 5 → 6 (Hidden Single)
  2. Row 2 / Column 1 → 6 (Hidden Single)
  3. Row 2 / Column 3 → 5 (Hidden Single)
  4. Row 2 / Column 7 → 3 (Hidden Single)
  5. Locked Candidates Type 1 (Pointing): 2 in b3 => r3c6<>2
  6. Locked Candidates Type 1 (Pointing): 3 in b5 => r9c6<>3
  7. Naked Pair: 7,8 in r1c8,r2c9 => r1c9,r3c78<>7, r1c9,r3c8<>8
  8. Row 3 / Column 8 → 2 (Naked Single)
  9. Row 4 / Column 8 → 5 (Naked Single)
  10. Row 4 / Column 7 → 2 (Hidden Single)
  11. Row 6 / Column 2 → 2 (Hidden Single)
  12. Row 5 / Column 2 → 5 (Hidden Single)
  13. Hidden Pair: 2,5 in r89c1 => r89c1<>3, r89c1<>4, r8c1<>7, r9c1<>1
  14. 2-String Kite: 1 in r1c6,r5c7 (connected by r1c9,r3c7) => r5c6<>1
  15. 2-String Kite: 1 in r4c1,r9c6 (connected by r7c1,r9c3) => r4c6<>1
  16. Sashimi Swordfish: 1 c157 r347 fr5c7 => r4c9<>1
  17. Row 4 / Column 9 → 9 (Naked Single)
  18. Locked Candidates Type 1 (Pointing): 1 in b6 => r5c34<>1
  19. Row 5 / Column 3 → 3 (Naked Single)
  20. Row 4 / Column 6 → 3 (Hidden Single)
  21. XY-Chain: 9 9- r3c5 -1- r3c7 -4- r1c9 -1- r5c9 -7- r5c6 -9 => r13c6<>9
  22. Row 1 / Column 2 → 9 (Hidden Single)
  23. Row 3 / Column 5 → 9 (Hidden Single)
  24. Row 8 / Column 5 → 3 (Naked Single)
  25. Row 7 / Column 5 → 1 (Full House)
  26. Row 4 / Column 1 → 1 (Hidden Single)
  27. Row 4 / Column 4 → 4 (Full House)
  28. Row 6 / Column 3 → 4 (Full House)
  29. Row 7 / Column 4 → 9 (Naked Single)
  30. Row 8 / Column 4 → 2 (Naked Single)
  31. Row 9 / Column 6 → 4 (Full House)
  32. Row 2 / Column 4 → 7 (Naked Single)
  33. Row 8 / Column 1 → 5 (Naked Single)
  34. Row 9 / Column 9 → 5 (Naked Single)
  35. Row 2 / Column 9 → 8 (Naked Single)
  36. Row 2 / Column 6 → 2 (Full House)
  37. Row 5 / Column 4 → 6 (Naked Single)
  38. Row 6 / Column 4 → 1 (Full House)
  39. Row 9 / Column 1 → 2 (Naked Single)
  40. Row 1 / Column 8 → 7 (Naked Single)
  41. Row 6 / Column 6 → 7 (Naked Single)
  42. Row 6 / Column 8 → 6 (Full House)
  43. Row 5 / Column 6 → 9 (Full House)
  44. Row 1 / Column 1 → 4 (Naked Single)
  45. Row 9 / Column 8 → 3 (Naked Single)
  46. Row 7 / Column 8 → 8 (Full House)
  47. Row 1 / Column 9 → 1 (Naked Single)
  48. Row 1 / Column 6 → 8 (Full House)
  49. Row 3 / Column 7 → 4 (Full House)
  50. Row 3 / Column 6 → 1 (Full House)
  51. Row 9 / Column 2 → 6 (Naked Single)
  52. Row 7 / Column 3 → 7 (Naked Single)
  53. Row 5 / Column 9 → 7 (Naked Single)
  54. Row 5 / Column 7 → 1 (Full House)
  55. Row 8 / Column 9 → 4 (Full House)
  56. Row 9 / Column 7 → 9 (Naked Single)
  57. Row 9 / Column 3 → 1 (Full House)
  58. Row 3 / Column 3 → 8 (Naked Single)
  59. Row 8 / Column 3 → 9 (Full House)
  60. Row 7 / Column 1 → 3 (Naked Single)
  61. Row 3 / Column 1 → 7 (Full House)
  62. Row 3 / Column 2 → 3 (Full House)
  63. Row 7 / Column 7 → 6 (Naked Single)
  64. Row 8 / Column 7 → 7 (Full House)
  65. Row 8 / Column 2 → 8 (Full House)
  66. Row 7 / Column 2 → 4 (Full House)
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