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

This Sudoku Puzzle has 74 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), undefined, Continuous Nice Loop, Sue de Coq, Discontinuous Nice Loop, Naked Single, Full House 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 6 / Column 9 → 1 (Hidden Single)
  2. Row 4 / Column 4 → 3 (Hidden Single)
  3. Row 4 / Column 3 → 7 (Hidden Single)
  4. Row 8 / Column 4 → 7 (Hidden Single)
  5. Row 5 / Column 5 → 7 (Hidden Single)
  6. Row 9 / Column 9 → 7 (Hidden Single)
  7. Row 6 / Column 5 → 2 (Hidden Single)
  8. Row 3 / Column 5 → 4 (Hidden Single)
  9. Row 2 / Column 8 → 4 (Hidden Single)
  10. Row 2 / Column 6 → 1 (Hidden Single)
  11. Row 1 / Column 9 → 2 (Hidden Single)
  12. Row 2 / Column 1 → 7 (Hidden Single)
  13. Row 3 / Column 8 → 7 (Hidden Single)
  14. Locked Candidates Type 1 (Pointing): 5 in b6 => r78c8<>5
  15. Locked Candidates Type 1 (Pointing): 8 in b8 => r1c5<>8
  16. Locked Candidates Type 2 (Claiming): 9 in r9 => r7c13,r8c12<>9
  17. 2-String Kite: 4 in r5c7,r8c1 (connected by r8c9,r9c7) => r5c1<>4
  18. Locked Candidates Type 1 (Pointing): 4 in b4 => r9c3<>4
  19. XYZ-Wing: 2/6/8 in r2c23,r4c2 => r3c2<>8
  20. Continuous Nice Loop: 1/5/6/8/9 3= r3c2 =1= r3c3 -1- r7c3 =1= r7c5 =6= r1c5 -6- r2c4 =6= r2c2 =2= r8c2 =3= r3c2 =1 => r9c3<>1, r7c5<>5, r3c24<>6, r28c2,r7c5<>8, r3c2<>9
  21. XY-Wing: 2/6/8 in r2c23,r4c2 => r6c3<>8
  22. Locked Candidates Type 1 (Pointing): 8 in b4 => r9c2<>8
  23. Sue de Coq: r89c2 - {1239} (r3c2 - {13}, r789c1,r9c3 - {24589}) => r7c3<>2, r7c3<>5, r7c3<>8
  24. XY-Chain: 5 5- r4c8 -8- r4c2 -6- r2c2 -2- r2c3 -8- r2c4 -6- r6c4 -5 => r4c6,r6c8<>5
  25. Row 4 / Column 8 → 5 (Hidden Single)
  26. Discontinuous Nice Loop: 8 r3c1 -8- r3c4 -5- r1c5 -6- r7c5 -1- r7c3 =1= r3c3 =9= r3c1 => r3c1<>8
  27. Discontinuous Nice Loop: 8 r3c3 -8- r3c4 -5- r1c5 -6- r7c5 -1- r7c3 =1= r3c3 => r3c3<>8
  28. Discontinuous Nice Loop: 6 r4c6 -6- r6c4 =6= r2c4 =8= r2c3 =2= r5c3 =4= r6c3 -4- r6c6 =4= r4c6 => r4c6<>6
  29. Row 4 / Column 6 → 4 (Naked Single)
  30. Row 6 / Column 3 → 4 (Hidden Single)
  31. Locked Candidates Type 1 (Pointing): 6 in b5 => r6c2<>6
  32. XY-Chain: 9 9- r5c3 -2- r2c3 -8- r2c4 -6- r2c2 -2- r8c2 -3- r3c2 -1- r9c2 -9- r6c2 -8- r6c8 -9 => r5c89,r6c2<>9
  33. Row 5 / Column 8 → 3 (Naked Single)
  34. Row 6 / Column 2 → 8 (Naked Single)
  35. Row 4 / Column 2 → 6 (Naked Single)
  36. Row 4 / Column 9 → 8 (Full House)
  37. Row 6 / Column 8 → 9 (Naked Single)
  38. Row 2 / Column 2 → 2 (Naked Single)
  39. Row 2 / Column 3 → 8 (Naked Single)
  40. Row 2 / Column 4 → 6 (Full House)
  41. Row 8 / Column 2 → 3 (Naked Single)
  42. Row 1 / Column 5 → 5 (Naked Single)
  43. Row 3 / Column 4 → 8 (Full House)
  44. Row 6 / Column 4 → 5 (Full House)
  45. Row 6 / Column 6 → 6 (Full House)
  46. Row 3 / Column 2 → 1 (Naked Single)
  47. Row 9 / Column 2 → 9 (Full House)
  48. Row 7 / Column 3 → 1 (Naked Single)
  49. Row 1 / Column 1 → 6 (Naked Single)
  50. Row 1 / Column 3 → 3 (Naked Single)
  51. Row 1 / Column 7 → 8 (Full House)
  52. Row 8 / Column 5 → 8 (Naked Single)
  53. Row 9 / Column 3 → 5 (Naked Single)
  54. Row 7 / Column 5 → 6 (Naked Single)
  55. Row 9 / Column 5 → 1 (Full House)
  56. Row 8 / Column 8 → 2 (Naked Single)
  57. Row 7 / Column 8 → 8 (Full House)
  58. Row 3 / Column 3 → 9 (Naked Single)
  59. Row 3 / Column 1 → 5 (Full House)
  60. Row 5 / Column 3 → 2 (Full House)
  61. Row 5 / Column 1 → 9 (Full House)
  62. Row 9 / Column 7 → 4 (Naked Single)
  63. Row 9 / Column 1 → 8 (Full House)
  64. Row 8 / Column 1 → 4 (Naked Single)
  65. Row 7 / Column 1 → 2 (Full House)
  66. Row 5 / Column 7 → 6 (Naked Single)
  67. Row 5 / Column 9 → 4 (Full House)
  68. Row 8 / Column 9 → 9 (Naked Single)
  69. Row 8 / Column 6 → 5 (Full House)
  70. Row 7 / Column 6 → 9 (Full House)
  71. Row 3 / Column 7 → 3 (Naked Single)
  72. Row 3 / Column 9 → 6 (Full House)
  73. Row 7 / Column 9 → 3 (Full House)
  74. Row 7 / Column 7 → 5 (Full House)
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