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

This Sudoku Puzzle has 71 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 2 (Claiming), Hidden Rectangle, Sue de Coq, Discontinuous Nice Loop, Grouped AIC, Locked Candidates Type 1 (Pointing), Swordfish, undefined, Empty Rectangle 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 6 → 1 (Naked Single)
  2. Row 5 / Column 5 → 5 (Naked Single)
  3. Row 4 / Column 4 → 8 (Full House)
  4. Row 3 / Column 5 → 1 (Hidden Single)
  5. Row 5 / Column 7 → 2 (Hidden Single)
  6. Row 8 / Column 9 → 5 (Hidden Single)
  7. Row 7 / Column 6 → 5 (Hidden Single)
  8. Row 4 / Column 7 → 1 (Hidden Single)
  9. Row 3 / Column 3 → 4 (Hidden Single)
  10. Row 4 / Column 2 → 4 (Hidden Single)
  11. Locked Candidates Type 2 (Claiming): 8 in r3 => r1c9,r2c7<>8
  12. Hidden Rectangle: 6/8 in r1c36,r2c36 => r1c3<>6
  13. Hidden Rectangle: 1/9 in r7c49,r9c49 => r9c9<>9
  14. Sue de Coq: r456c1 - {235679} (r3c1 - {79}, r46c3 - {2356}) => r5c2<>3, r1c1<>7, r1c1<>9
  15. Discontinuous Nice Loop: 3 r1c1 -3- r1c9 -9- r1c5 -6- r2c6 -8- r2c3 =8= r1c3 =5= r1c1 => r1c1<>3
  16. Hidden Rectangle: 5/6 in r1c13,r4c13 => r4c3<>6
  17. Discontinuous Nice Loop: 3 r1c3 -3- r1c9 -9- r1c5 -6- r2c6 -8- r2c3 =8= r1c3 => r1c3<>3
  18. Discontinuous Nice Loop: 6 r1c2 -6- r7c2 =6= r7c5 -6- r9c6 -2- r1c6 =2= r1c4 =7= r1c2 => r1c2<>6
  19. Sue de Coq: r1c45 - {2679} (r1c29 - {379}, r12c6 - {268}) => r2c5<>6
  20. Grouped AIC: 8 8- r1c3 -5- r1c1 -6- r46c1 =6= r6c3 =2= r9c3 -2- r9c6 -6- r2c6 -8 => r1c6,r2c3<>8
  21. Row 1 / Column 3 → 8 (Hidden Single)
  22. Row 2 / Column 6 → 8 (Hidden Single)
  23. Row 1 / Column 1 → 5 (Hidden Single)
  24. Row 4 / Column 3 → 5 (Hidden Single)
  25. Locked Candidates Type 1 (Pointing): 3 in b4 => r8c1<>3
  26. Row 8 / Column 1 → 2 (Naked Single)
  27. Row 6 / Column 3 → 2 (Hidden Single)
  28. Swordfish: 3 c357 r279 => r27c2,r79c9,r9c8<>3
  29. Sue de Coq: r9c45 - {123469} (r9c36 - {236}, r78c4 - {149}) => r7c5<>9, r9c7<>3
  30. W-Wing: 9/7 in r3c1,r9c7 connected by 7 in r39c8 => r3c7<>9
  31. Empty Rectangle: 9 in b4 (r3c18) => r5c8<>9
  32. XY-Chain: 4 4- r2c5 -9- r1c5 -6- r1c6 -2- r9c6 -6- r9c3 -3- r8c2 -1- r8c4 -4 => r2c4,r9c5<>4
  33. Row 2 / Column 5 → 4 (Hidden Single)
  34. W-Wing: 9/7 in r2c4,r3c1 connected by 7 in r1c24 => r2c2<>9
  35. 2-String Kite: 9 in r2c7,r9c5 (connected by r1c5,r2c4) => r9c7<>9
  36. Row 9 / Column 7 → 7 (Naked Single)
  37. Row 3 / Column 7 → 8 (Naked Single)
  38. Row 3 / Column 8 → 7 (Hidden Single)
  39. Row 3 / Column 1 → 9 (Full House)
  40. Row 6 / Column 1 → 6 (Naked Single)
  41. Row 4 / Column 1 → 3 (Naked Single)
  42. Row 4 / Column 8 → 6 (Full House)
  43. Row 5 / Column 1 → 7 (Full House)
  44. Row 5 / Column 2 → 9 (Full House)
  45. Row 5 / Column 8 → 8 (Hidden Single)
  46. Row 5 / Column 9 → 3 (Full House)
  47. Row 1 / Column 9 → 9 (Naked Single)
  48. Row 2 / Column 7 → 3 (Full House)
  49. Row 7 / Column 7 → 9 (Full House)
  50. Row 1 / Column 5 → 6 (Naked Single)
  51. Row 6 / Column 9 → 4 (Naked Single)
  52. Row 6 / Column 8 → 9 (Full House)
  53. Row 2 / Column 3 → 6 (Naked Single)
  54. Row 9 / Column 3 → 3 (Full House)
  55. Row 7 / Column 4 → 1 (Naked Single)
  56. Row 9 / Column 8 → 4 (Naked Single)
  57. Row 8 / Column 8 → 3 (Full House)
  58. Row 1 / Column 6 → 2 (Naked Single)
  59. Row 9 / Column 6 → 6 (Full House)
  60. Row 7 / Column 5 → 3 (Naked Single)
  61. Row 9 / Column 5 → 9 (Full House)
  62. Row 9 / Column 9 → 1 (Naked Single)
  63. Row 7 / Column 9 → 8 (Full House)
  64. Row 7 / Column 2 → 6 (Full House)
  65. Row 8 / Column 2 → 1 (Full House)
  66. Row 8 / Column 4 → 4 (Full House)
  67. Row 9 / Column 4 → 2 (Full House)
  68. Row 2 / Column 2 → 7 (Naked Single)
  69. Row 1 / Column 2 → 3 (Full House)
  70. Row 1 / Column 4 → 7 (Full House)
  71. Row 2 / Column 4 → 9 (Full House)
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