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.

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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