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

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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