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

This Sudoku Puzzle has 82 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Single, Full House, Locked Candidates Type 2 (Claiming), Naked Triple, undefined, Empty Rectangle, Hidden Rectangle, Discontinuous Nice Loop, Grouped Discontinuous Nice Loop, Swordfish 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 3 → 4 (Hidden Single)
  2. Row 5 / Column 5 → 3 (Hidden Single)
  3. Row 9 / Column 4 → 4 (Hidden Single)
  4. Row 8 / Column 4 → 6 (Hidden Single)
  5. Row 2 / Column 4 → 8 (Hidden Single)
  6. Locked Candidates Type 1 (Pointing): 9 in b5 => r8c6<>9
  7. Row 8 / Column 6 → 5 (Naked Single)
  8. Row 2 / Column 6 → 1 (Naked Single)
  9. Row 4 / Column 4 → 5 (Hidden Single)
  10. Row 5 / Column 4 → 2 (Naked Single)
  11. Row 6 / Column 4 → 1 (Full House)
  12. Row 4 / Column 8 → 1 (Hidden Single)
  13. Row 6 / Column 2 → 2 (Hidden Single)
  14. Locked Candidates Type 2 (Claiming): 6 in c2 => r1c13<>6
  15. Naked Triple: 1,2,8 in r137c1 => r9c1<>1, r9c1<>2, r9c1<>8
  16. Locked Candidates Type 1 (Pointing): 2 in b7 => r13c3<>2
  17. 2-String Kite: 3 in r3c3,r8c8 (connected by r2c8,r3c9) => r8c3<>3
  18. Empty Rectangle: 7 in b6 (r59c1) => r9c8<>7
  19. Hidden Rectangle: 2/8 in r8c38,r9c38 => r8c3<>8
  20. Row 8 / Column 3 → 2 (Naked Single)
  21. Discontinuous Nice Loop: 2 r2c9 -2- r2c8 -3- r8c8 =3= r7c9 =4= r2c9 => r2c9<>2
  22. Discontinuous Nice Loop: 8 r7c7 -8- r9c8 -2- r2c8 -3- r2c9 -4- r2c7 =4= r7c7 => r7c7<>8
  23. Discontinuous Nice Loop: 1 r9c3 -1- r9c5 -8- r9c8 -2- r2c8 -3- r8c8 =3= r8c2 =7= r9c1 =6= r9c3 => r9c3<>1
  24. Row 9 / Column 5 → 1 (Hidden Single)
  25. Discontinuous Nice Loop: 9 r8c8 -9- r6c8 -7- r6c6 =7= r4c6 -7- r4c2 =7= r8c2 =3= r8c8 => r8c8<>9
  26. Discontinuous Nice Loop: 8 r9c3 -8- r9c8 -2- r2c8 -3- r8c8 =3= r8c2 =7= r9c1 =6= r9c3 => r9c3<>8
  27. Locked Candidates Type 2 (Claiming): 8 in r9 => r8c78<>8
  28. Discontinuous Nice Loop: 9 r5c7 -9- r5c3 -6- r5c1 -7- r9c1 =7= r8c2 -7- r8c7 -9- r5c7 => r5c7<>9
  29. Discontinuous Nice Loop: 7 r9c9 -7- r8c8 -3- r2c8 -2- r9c8 =2= r9c9 => r9c9<>7
  30. Grouped Discontinuous Nice Loop: 8 r3c3 -8- r13c1 =8= r7c1 =1= r7c3 =3= r3c3 => r3c3<>8
  31. Discontinuous Nice Loop: 1 r1c1 -1- r1c7 =1= r3c7 =8= r3c1 =2= r1c1 => r1c1<>1
  32. Discontinuous Nice Loop: 8 r1c2 -8- r3c1 =8= r3c7 =1= r1c7 =6= r1c2 => r1c2<>8
  33. Discontinuous Nice Loop: 2 r1c9 -2- r1c1 -8- r1c8 =8= r9c8 =2= r9c9 -2- r1c9 => r1c9<>2
  34. Grouped Discontinuous Nice Loop: 7 r3c7 -7- r3c5 -2- r2c5 =2= r2c8 =3= r8c8 =7= r89c7 -7- r3c7 => r3c7<>7
  35. Grouped Discontinuous Nice Loop: 5 r7c7 -5- r5c7 -7- r89c7 =7= r8c8 =3= r7c9 =4= r7c7 => r7c7<>5
  36. Almost Locked Set XZ-Rule: A=r2578c7 {45679}, B=r15c9 {579}, X=5, Z=9 => r7c9<>9
  37. Locked Candidates Type 1 (Pointing): 9 in b9 => r1c7<>9
  38. Almost Locked Set XZ-Rule: A=r59c7 {578}, B=r289c8 {2378}, X=8, Z=7 => r8c7<>7
  39. Row 8 / Column 7 → 9 (Naked Single)
  40. Row 7 / Column 7 → 4 (Naked Single)
  41. Row 8 / Column 5 → 8 (Naked Single)
  42. Row 7 / Column 5 → 9 (Full House)
  43. Row 2 / Column 7 → 6 (Naked Single)
  44. Row 2 / Column 9 → 4 (Hidden Single)
  45. Row 1 / Column 2 → 6 (Hidden Single)
  46. X-Wing: 3 r28 c28 => r7c2<>3
  47. Swordfish: 7 r468 c268 => r1c8<>7
  48. W-Wing: 5/3 in r2c2,r7c9 connected by 3 in r3c39 => r7c2<>5
  49. Row 7 / Column 2 → 8 (Naked Single)
  50. Row 4 / Column 2 → 7 (Naked Single)
  51. Row 7 / Column 1 → 1 (Naked Single)
  52. Row 4 / Column 6 → 9 (Naked Single)
  53. Row 4 / Column 3 → 8 (Full House)
  54. Row 6 / Column 6 → 7 (Full House)
  55. Row 6 / Column 8 → 9 (Full House)
  56. Row 5 / Column 1 → 6 (Naked Single)
  57. Row 5 / Column 3 → 9 (Full House)
  58. Row 8 / Column 2 → 3 (Naked Single)
  59. Row 2 / Column 2 → 5 (Full House)
  60. Row 8 / Column 8 → 7 (Full House)
  61. Row 9 / Column 1 → 7 (Naked Single)
  62. Row 7 / Column 3 → 5 (Naked Single)
  63. Row 7 / Column 9 → 3 (Full House)
  64. Row 9 / Column 3 → 6 (Full House)
  65. Row 1 / Column 3 → 1 (Naked Single)
  66. Row 3 / Column 3 → 3 (Full House)
  67. Row 2 / Column 5 → 2 (Naked Single)
  68. Row 2 / Column 8 → 3 (Full House)
  69. Row 3 / Column 5 → 7 (Naked Single)
  70. Row 1 / Column 5 → 5 (Full House)
  71. Row 3 / Column 9 → 2 (Naked Single)
  72. Row 1 / Column 8 → 8 (Naked Single)
  73. Row 9 / Column 8 → 2 (Full House)
  74. Row 3 / Column 1 → 8 (Naked Single)
  75. Row 1 / Column 1 → 2 (Full House)
  76. Row 3 / Column 7 → 1 (Full House)
  77. Row 9 / Column 9 → 5 (Naked Single)
  78. Row 9 / Column 7 → 8 (Full House)
  79. Row 1 / Column 7 → 7 (Naked Single)
  80. Row 1 / Column 9 → 9 (Full House)
  81. Row 5 / Column 9 → 7 (Full House)
  82. Row 5 / Column 7 → 5 (Full House)
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