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

This Sudoku Puzzle has 77 steps and it is solved using Locked Candidates Type 1 (Pointing), Hidden Pair, AIC, Hidden Single, undefined, Locked Candidates Type 2 (Claiming), Discontinuous Nice Loop, Naked Triple, Naked Single, Naked Pair, Finned Swordfish, Swordfish, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Locked Candidates Type 1 (Pointing): 3 in b1 => r79c2<>3
  2. Hidden Pair: 1,7 in r4c3,r5c2 => r4c3<>4, r4c3<>9, r5c2<>6
  3. Hidden Pair: 7,9 in r7c8,r9c9 => r7c8,r9c9<>3, r7c8<>8, r9c9<>2, r9c9<>4
  4. Hidden Pair: 1,7 in r49c3 => r9c3<>4, r9c3<>5
  5. AIC: 1 1- r3c5 =1= r9c5 =2= r9c7 =4= r3c7 -4- r3c4 =4= r4c4 =7= r4c3 =1= r9c3 -1- r7c2 =1= r7c6 -1 => r2c6,r9c5<>1
  6. Row 3 / Column 5 → 1 (Hidden Single)
  7. XY-Chain: 3 3- r3c8 -2- r2c7 -6- r5c7 -8- r7c7 -3 => r3c7,r8c8<>3
  8. Locked Candidates Type 2 (Claiming): 3 in c7 => r8c9<>3
  9. Discontinuous Nice Loop: 9 r2c1 -9- r5c1 -6- r6c2 -2- r3c2 =2= r2c1 => r2c1<>9
  10. Locked Candidates Type 1 (Pointing): 9 in b1 => r6c3<>9
  11. Discontinuous Nice Loop: 3 r4c4 -3- r8c4 =3= r8c1 -3- r9c1 -4- r9c7 =4= r3c7 -4- r3c4 =4= r4c4 => r4c4<>3
  12. Locked Candidates Type 1 (Pointing): 3 in b5 => r79c6<>3
  13. Naked Triple: 1,7,9 in r9c369 => r9c2<>1, r9c2<>7, r9c5<>9
  14. Row 9 / Column 2 → 5 (Naked Single)
  15. Row 9 / Column 5 → 2 (Naked Single)
  16. Row 8 / Column 5 → 5 (Naked Single)
  17. Row 5 / Column 4 → 5 (Hidden Single)
  18. Locked Candidates Type 2 (Claiming): 9 in c5 => r4c46,r6c6<>9
  19. Locked Candidates Type 2 (Claiming): 2 in c7 => r2c89,r3c8<>2
  20. Row 3 / Column 8 → 3 (Naked Single)
  21. Row 1 / Column 2 → 3 (Hidden Single)
  22. Naked Pair: 2,6 in r36c2 => r7c2<>6
  23. Finned Swordfish: 7 r157 c258 fr1c9 => r2c8<>7
  24. Swordfish: 7 r249 c349 => r1c9<>7
  25. Naked Triple: 2,4,6 in r1c9,r23c7 => r2c9<>6
  26. W-Wing: 1/7 in r2c9,r4c3 connected by 7 in r9c39 => r4c9<>1
  27. XY-Chain: 9 9- r6c5 -8- r1c5 -7- r1c8 -5- r2c8 -1- r2c9 -7- r9c9 -9 => r6c9<>9
  28. Discontinuous Nice Loop: 6/8/9 r2c3 =5= r2c8 =1= r2c9 =7= r2c4 -7- r4c4 -4- r3c4 =4= r3c7 -4- r9c7 -3- r7c7 -8- r5c7 =8= r5c5 =7= r1c5 -7- r1c8 -5- r1c3 =5= r2c3 => r2c3<>6, r2c3<>8, r2c3<>9
  29. Row 2 / Column 3 → 5 (Naked Single)
  30. Row 2 / Column 8 → 1 (Naked Single)
  31. Row 2 / Column 9 → 7 (Naked Single)
  32. Row 1 / Column 8 → 5 (Naked Single)
  33. Row 9 / Column 9 → 9 (Naked Single)
  34. Row 7 / Column 8 → 7 (Naked Single)
  35. Row 9 / Column 6 → 1 (Naked Single)
  36. Row 7 / Column 2 → 1 (Naked Single)
  37. Row 9 / Column 3 → 7 (Naked Single)
  38. Row 5 / Column 2 → 7 (Naked Single)
  39. Row 4 / Column 3 → 1 (Naked Single)
  40. Row 3 / Column 3 → 9 (Hidden Single)
  41. Row 5 / Column 9 → 1 (Hidden Single)
  42. Row 1 / Column 5 → 7 (Hidden Single)
  43. Row 4 / Column 4 → 7 (Hidden Single)
  44. Row 3 / Column 4 → 4 (Hidden Single)
  45. Row 1 / Column 9 → 4 (Hidden Single)
  46. Row 8 / Column 9 → 2 (Naked Single)
  47. Row 4 / Column 9 → 3 (Naked Single)
  48. Row 6 / Column 9 → 6 (Full House)
  49. Row 8 / Column 8 → 8 (Naked Single)
  50. Row 4 / Column 6 → 4 (Naked Single)
  51. Row 5 / Column 7 → 8 (Naked Single)
  52. Row 6 / Column 2 → 2 (Naked Single)
  53. Row 3 / Column 2 → 6 (Full House)
  54. Row 3 / Column 7 → 2 (Full House)
  55. Row 2 / Column 7 → 6 (Full House)
  56. Row 6 / Column 3 → 4 (Naked Single)
  57. Row 7 / Column 7 → 3 (Naked Single)
  58. Row 9 / Column 7 → 4 (Full House)
  59. Row 9 / Column 1 → 3 (Full House)
  60. Row 5 / Column 5 → 9 (Naked Single)
  61. Row 5 / Column 1 → 6 (Full House)
  62. Row 4 / Column 1 → 9 (Full House)
  63. Row 6 / Column 5 → 8 (Full House)
  64. Row 4 / Column 8 → 2 (Full House)
  65. Row 6 / Column 8 → 9 (Full House)
  66. Row 6 / Column 6 → 3 (Full House)
  67. Row 1 / Column 3 → 8 (Naked Single)
  68. Row 8 / Column 3 → 6 (Full House)
  69. Row 1 / Column 6 → 6 (Full House)
  70. Row 2 / Column 1 → 2 (Full House)
  71. Row 2 / Column 4 → 9 (Naked Single)
  72. Row 2 / Column 6 → 8 (Full House)
  73. Row 7 / Column 6 → 9 (Full House)
  74. Row 7 / Column 1 → 8 (Naked Single)
  75. Row 8 / Column 1 → 4 (Full House)
  76. Row 8 / Column 4 → 3 (Full House)
  77. Row 7 / Column 4 → 6 (Full House)
Show More...