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

This Sudoku Puzzle has 79 steps and it is solved using Locked Candidates Type 1 (Pointing), undefined, Discontinuous Nice Loop, Grouped Discontinuous Nice Loop, Hidden Pair, Empty Rectangle, Hidden Single, Naked Single, Full House, AIC, Naked Triple, Hidden Rectangle techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Locked Candidates Type 1 (Pointing): 2 in b2 => r9c4<>2
  2. Locked Candidates Type 1 (Pointing): 2 in b4 => r7c3<>2
  3. Locked Candidates Type 1 (Pointing): 5 in b5 => r9c4<>5
  4. Locked Candidates Type 1 (Pointing): 6 in b7 => r3c1<>6
  5. 2-String Kite: 4 in r4c7,r7c3 (connected by r4c2,r5c3) => r7c7<>4
  6. Discontinuous Nice Loop: 1 r2c4 -1- r6c4 -5- r6c8 -2- r2c8 =2= r2c4 => r2c4<>1
  7. Discontinuous Nice Loop: 7 r2c5 -7- r2c3 -9- r6c3 =9= r6c6 =1= r6c4 -1- r3c4 =1= r2c5 => r2c5<>7
  8. Discontinuous Nice Loop: 5 r9c8 -5- r9c5 =5= r8c5 =1= r2c5 -1- r3c4 =1= r6c4 =5= r6c8 -5- r9c8 => r9c8<>5
  9. Grouped Discontinuous Nice Loop: 5 r3c1 -5- r789c1 =5= r7c3 =4= r5c3 -4- r4c2 -8- r5c1 =8= r3c1 => r3c1<>5
  10. Locked Candidates Type 1 (Pointing): 5 in b1 => r7c3<>5
  11. Hidden Pair: 5,6 in r13c3 => r13c3<>7, r1c3<>9
  12. Empty Rectangle: 7 in b9 (r27c3) => r2c8<>7
  13. XY-Chain: 1 1- r3c1 -8- r5c1 -9- r6c3 -2- r6c8 -5- r6c4 -1 => r3c4<>1
  14. Row 6 / Column 4 → 1 (Hidden Single)
  15. Row 6 / Column 6 → 9 (Naked Single)
  16. Row 6 / Column 3 → 2 (Naked Single)
  17. Row 6 / Column 8 → 5 (Full House)
  18. Row 2 / Column 5 → 1 (Hidden Single)
  19. Row 4 / Column 4 → 5 (Hidden Single)
  20. Row 5 / Column 7 → 2 (Hidden Single)
  21. Empty Rectangle: 3 in b8 (r4c67) => r8c7<>3
  22. AIC: 4 4- r1c8 =4= r1c9 =9= r1c2 -9- r2c3 =9= r5c3 =4= r5c9 -4- r4c7 =4= r9c7 -4 => r79c8<>4
  23. Row 1 / Column 8 → 4 (Hidden Single)
  24. X-Wing: 4 r49 c27 => r7c2<>4
  25. Discontinuous Nice Loop: 7 r3c2 -7- r2c3 -9- r5c3 =9= r5c1 =8= r3c1 =1= r3c2 => r3c2<>7
  26. Discontinuous Nice Loop: 5 r7c9 -5- r7c1 -1- r3c1 -8- r5c1 -9- r5c3 -4- r5c9 =4= r7c9 => r7c9<>5
  27. Locked Candidates Type 1 (Pointing): 5 in b9 => r3c7<>5
  28. Naked Triple: 1,3,8 in r3c127 => r3c489<>3, r3c48<>8
  29. XY-Wing: 3/4/8 in r34c7,r4c2 => r3c2<>8
  30. Hidden Rectangle: 2/7 in r2c48,r3c48 => r2c4<>7
  31. Discontinuous Nice Loop: 3 r7c7 -3- r3c7 -8- r3c1 =8= r5c1 -8- r4c2 -4- r4c7 -3- r7c7 => r7c7<>3
  32. XY-Wing: 1/5/8 in r37c1,r7c7 => r3c7<>8
  33. Row 3 / Column 7 → 3 (Naked Single)
  34. Row 3 / Column 2 → 1 (Naked Single)
  35. Row 4 / Column 7 → 4 (Naked Single)
  36. Row 5 / Column 9 → 3 (Full House)
  37. Row 3 / Column 1 → 8 (Naked Single)
  38. Row 4 / Column 2 → 8 (Naked Single)
  39. Row 4 / Column 6 → 3 (Full House)
  40. Row 5 / Column 1 → 9 (Naked Single)
  41. Row 5 / Column 3 → 4 (Full House)
  42. Row 7 / Column 3 → 7 (Naked Single)
  43. Row 2 / Column 3 → 9 (Naked Single)
  44. Row 7 / Column 2 → 2 (Naked Single)
  45. Row 7 / Column 9 → 4 (Naked Single)
  46. Row 8 / Column 2 → 9 (Naked Single)
  47. Row 2 / Column 9 → 7 (Naked Single)
  48. Row 8 / Column 7 → 5 (Naked Single)
  49. Row 9 / Column 2 → 4 (Naked Single)
  50. Row 2 / Column 2 → 3 (Naked Single)
  51. Row 1 / Column 2 → 7 (Full House)
  52. Row 3 / Column 8 → 2 (Naked Single)
  53. Row 3 / Column 9 → 5 (Naked Single)
  54. Row 1 / Column 9 → 9 (Full House)
  55. Row 2 / Column 8 → 8 (Full House)
  56. Row 2 / Column 4 → 2 (Full House)
  57. Row 7 / Column 7 → 8 (Naked Single)
  58. Row 9 / Column 7 → 9 (Full House)
  59. Row 3 / Column 3 → 6 (Naked Single)
  60. Row 1 / Column 3 → 5 (Full House)
  61. Row 3 / Column 4 → 7 (Full House)
  62. Row 7 / Column 8 → 3 (Naked Single)
  63. Row 7 / Column 6 → 1 (Naked Single)
  64. Row 7 / Column 1 → 5 (Full House)
  65. Row 9 / Column 4 → 8 (Naked Single)
  66. Row 8 / Column 6 → 7 (Naked Single)
  67. Row 9 / Column 1 → 6 (Naked Single)
  68. Row 8 / Column 1 → 1 (Full House)
  69. Row 5 / Column 4 → 6 (Naked Single)
  70. Row 1 / Column 4 → 3 (Full House)
  71. Row 8 / Column 5 → 3 (Naked Single)
  72. Row 8 / Column 8 → 6 (Full House)
  73. Row 9 / Column 8 → 7 (Full House)
  74. Row 9 / Column 5 → 5 (Naked Single)
  75. Row 9 / Column 6 → 2 (Full House)
  76. Row 5 / Column 6 → 8 (Naked Single)
  77. Row 1 / Column 6 → 6 (Full House)
  78. Row 1 / Column 5 → 8 (Full House)
  79. Row 5 / Column 5 → 7 (Full House)
Show More...