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

This Sudoku Puzzle has 71 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Pair, Locked Candidates Type 1 (Pointing), Naked Triple, Locked Candidates Type 2 (Claiming), Uniqueness Test 3, Sue de Coq, Uniqueness Test 6, undefined techniques.

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

Solution Steps:

  1. Row 5 / Column 9 → 1 (Hidden Single)
  2. Row 8 / Column 6 → 3 (Hidden Single)
  3. Row 8 / Column 9 → 9 (Naked Single)
  4. Row 7 / Column 9 → 5 (Naked Single)
  5. Row 9 / Column 9 → 3 (Naked Single)
  6. Row 2 / Column 9 → 2 (Naked Single)
  7. Row 6 / Column 9 → 6 (Full House)
  8. Row 1 / Column 8 → 9 (Hidden Single)
  9. Row 3 / Column 6 → 2 (Hidden Single)
  10. Row 3 / Column 4 → 7 (Hidden Single)
  11. Row 8 / Column 1 → 7 (Hidden Single)
  12. Locked Pair: 3,4 in r46c8 => r46c7,r79c8<>4, r46c7<>3
  13. Row 4 / Column 8 → 3 (Hidden Single)
  14. Row 6 / Column 8 → 4 (Naked Single)
  15. Locked Candidates Type 1 (Pointing): 5 in b2 => r1c2<>5
  16. Locked Candidates Type 1 (Pointing): 9 in b2 => r2c13<>9
  17. Locked Candidates Type 1 (Pointing): 1 in b3 => r79c7<>1
  18. Locked Candidates Type 1 (Pointing): 8 in b3 => r79c7<>8
  19. Naked Triple: 2,3,5 in r6c127 => r6c35<>2, r6c45<>5
  20. Row 6 / Column 3 → 7 (Naked Single)
  21. Naked Triple: 4,8,9 in r689c4 => r124c4<>4, r12c4<>8, r2c4<>9
  22. Locked Candidates Type 2 (Claiming): 4 in c4 => r7c6,r9c5<>4
  23. Uniqueness Test 3: 8/9 in r6c45,r9c45 => r9c123<>4
  24. Sue de Coq: r4c45 - {24567} (r4c7 - {25}, r45c6 - {467}) => r5c5<>4, r4c3<>2
  25. Sue de Coq: r12c3 - {1468} (r4c3 - {46}, r3c123 - {1589}) => r1c2<>1, r1c2<>8, r5c3<>4, r59c3<>6
  26. Row 5 / Column 3 → 2 (Naked Single)
  27. Row 5 / Column 5 → 5 (Naked Single)
  28. Row 4 / Column 4 → 6 (Naked Single)
  29. Row 2 / Column 4 → 1 (Naked Single)
  30. Row 4 / Column 3 → 4 (Naked Single)
  31. Row 5 / Column 6 → 4 (Naked Single)
  32. Row 5 / Column 2 → 6 (Full House)
  33. Row 1 / Column 4 → 5 (Naked Single)
  34. Row 4 / Column 6 → 7 (Naked Single)
  35. Row 4 / Column 5 → 2 (Naked Single)
  36. Row 4 / Column 7 → 5 (Full House)
  37. Row 6 / Column 7 → 2 (Full House)
  38. Row 9 / Column 2 → 2 (Hidden Single)
  39. Row 9 / Column 1 → 6 (Hidden Single)
  40. Row 9 / Column 5 → 7 (Hidden Single)
  41. Row 9 / Column 7 → 4 (Naked Single)
  42. Row 7 / Column 7 → 7 (Naked Single)
  43. Row 8 / Column 4 → 4 (Hidden Single)
  44. Row 8 / Column 2 → 8 (Full House)
  45. Uniqueness Test 6: 6/8 in r1c36,r2c36 => r1c3,r2c6<>6
  46. Row 1 / Column 6 → 6 (Hidden Single)
  47. Row 2 / Column 3 → 6 (Hidden Single)
  48. XY-Chain: 1 1- r3c2 -5- r6c2 -3- r1c2 -4- r1c5 -8- r6c5 -9- r6c4 -8- r9c4 -9- r9c3 -1 => r13c3,r7c2<>1
  49. Row 1 / Column 3 → 8 (Naked Single)
  50. Row 7 / Column 2 → 4 (Naked Single)
  51. Row 1 / Column 5 → 4 (Naked Single)
  52. Row 3 / Column 3 → 9 (Naked Single)
  53. Row 9 / Column 3 → 1 (Full House)
  54. Row 7 / Column 1 → 9 (Full House)
  55. Row 1 / Column 2 → 3 (Naked Single)
  56. Row 1 / Column 7 → 1 (Full House)
  57. Row 3 / Column 1 → 5 (Naked Single)
  58. Row 9 / Column 8 → 8 (Naked Single)
  59. Row 7 / Column 8 → 1 (Full House)
  60. Row 7 / Column 6 → 8 (Full House)
  61. Row 9 / Column 4 → 9 (Full House)
  62. Row 2 / Column 6 → 9 (Full House)
  63. Row 6 / Column 4 → 8 (Full House)
  64. Row 2 / Column 5 → 8 (Full House)
  65. Row 6 / Column 5 → 9 (Full House)
  66. Row 2 / Column 1 → 4 (Naked Single)
  67. Row 3 / Column 2 → 1 (Full House)
  68. Row 6 / Column 2 → 5 (Full House)
  69. Row 3 / Column 7 → 8 (Full House)
  70. Row 6 / Column 1 → 3 (Full House)
  71. Row 2 / Column 7 → 3 (Full House)
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