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

This Sudoku Puzzle has 67 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Hidden Pair, undefined, Naked Single, AIC, Discontinuous Nice Loop, Full House techniques.

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

Solution Steps:

  1. Row 4 / Column 8 → 2 (Hidden Single)
  2. Row 4 / Column 4 → 6 (Hidden Single)
  3. Row 7 / Column 2 → 6 (Hidden Single)
  4. Row 8 / Column 7 → 6 (Hidden Single)
  5. Row 7 / Column 8 → 7 (Hidden Single)
  6. Row 7 / Column 4 → 9 (Hidden Single)
  7. Locked Candidates Type 1 (Pointing): 8 in b7 => r8c45<>8
  8. Locked Candidates Type 2 (Claiming): 5 in r7 => r8c45,r9c46<>5
  9. Hidden Pair: 1,2 in r1c2,r2c3 => r1c2,r2c3<>7, r1c2,r2c3<>8
  10. Hidden Pair: 3,9 in r56c9 => r56c9<>1, r56c9<>4, r56c9<>5, r6c9<>7
  11. 2-String Kite: 2 in r1c2,r8c5 (connected by r1c6,r2c5) => r8c2<>2
  12. X-Wing: 2 r28 c35 => r9c3<>2
  13. Row 9 / Column 3 → 7 (Naked Single)
  14. XY-Wing: 2/5/1 in r19c2,r9c8 => r1c8<>1
  15. 2-String Kite: 1 in r5c8,r8c4 (connected by r8c9,r9c8) => r5c4<>1
  16. Locked Candidates Type 1 (Pointing): 1 in b5 => r9c6<>1
  17. AIC: 1/4 1- r1c9 =1= r1c2 =2= r9c2 =5= r9c8 =1= r5c8 =4= r4c9 -4 => r4c9<>1, r1c9<>4
  18. Discontinuous Nice Loop: 5/7 r4c9 =4= r3c9 =6= r1c9 =1= r1c2 =2= r9c2 =5= r9c8 =1= r5c8 =4= r4c9 => r4c9<>5, r4c9<>7
  19. Row 4 / Column 9 → 4 (Naked Single)
  20. Row 6 / Column 3 → 4 (Hidden Single)
  21. Row 8 / Column 5 → 4 (Hidden Single)
  22. Row 8 / Column 4 → 1 (Naked Single)
  23. Row 8 / Column 9 → 5 (Naked Single)
  24. Row 9 / Column 8 → 1 (Full House)
  25. Row 9 / Column 4 → 3 (Naked Single)
  26. Row 9 / Column 6 → 2 (Naked Single)
  27. Row 9 / Column 2 → 5 (Full House)
  28. Row 8 / Column 3 → 2 (Hidden Single)
  29. Row 2 / Column 3 → 1 (Naked Single)
  30. Row 1 / Column 2 → 2 (Naked Single)
  31. Row 2 / Column 9 → 7 (Naked Single)
  32. Row 4 / Column 3 → 8 (Naked Single)
  33. Row 3 / Column 3 → 9 (Full House)
  34. Row 3 / Column 9 → 6 (Naked Single)
  35. Row 4 / Column 5 → 5 (Naked Single)
  36. Row 1 / Column 9 → 1 (Naked Single)
  37. Row 4 / Column 1 → 7 (Naked Single)
  38. Row 4 / Column 7 → 1 (Full House)
  39. Row 7 / Column 5 → 8 (Naked Single)
  40. Row 7 / Column 6 → 5 (Full House)
  41. Row 6 / Column 5 → 3 (Naked Single)
  42. Row 2 / Column 5 → 2 (Full House)
  43. Row 6 / Column 9 → 9 (Naked Single)
  44. Row 5 / Column 9 → 3 (Full House)
  45. Row 6 / Column 1 → 5 (Naked Single)
  46. Row 6 / Column 2 → 1 (Naked Single)
  47. Row 5 / Column 2 → 9 (Full House)
  48. Row 6 / Column 6 → 8 (Naked Single)
  49. Row 6 / Column 7 → 7 (Full House)
  50. Row 8 / Column 2 → 8 (Naked Single)
  51. Row 3 / Column 2 → 7 (Full House)
  52. Row 8 / Column 1 → 9 (Full House)
  53. Row 1 / Column 6 → 4 (Naked Single)
  54. Row 5 / Column 4 → 4 (Naked Single)
  55. Row 5 / Column 6 → 1 (Full House)
  56. Row 3 / Column 6 → 3 (Full House)
  57. Row 1 / Column 8 → 8 (Naked Single)
  58. Row 3 / Column 1 → 8 (Naked Single)
  59. Row 1 / Column 1 → 6 (Naked Single)
  60. Row 1 / Column 4 → 7 (Full House)
  61. Row 2 / Column 1 → 3 (Full House)
  62. Row 2 / Column 7 → 5 (Naked Single)
  63. Row 2 / Column 4 → 8 (Full House)
  64. Row 3 / Column 4 → 5 (Full House)
  65. Row 3 / Column 8 → 4 (Full House)
  66. Row 5 / Column 8 → 5 (Full House)
  67. Row 5 / Column 7 → 8 (Full House)
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