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

This Sudoku Puzzle has 72 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), undefined, Naked Triple, Hidden Rectangle, Multi Colors 1 techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 1 / Column 9 → 7 (Hidden Single)
  2. Row 2 / Column 7 → 2 (Hidden Single)
  3. Row 9 / Column 1 → 5 (Hidden Single)
  4. Row 4 / Column 9 → 9 (Hidden Single)
  5. Row 8 / Column 8 → 7 (Hidden Single)
  6. Row 1 / Column 7 → 5 (Hidden Single)
  7. Row 1 / Column 4 → 4 (Naked Single)
  8. Row 1 / Column 1 → 8 (Naked Single)
  9. Row 8 / Column 4 → 5 (Naked Single)
  10. Row 2 / Column 4 → 1 (Naked Single)
  11. Row 4 / Column 3 → 5 (Hidden Single)
  12. Row 6 / Column 9 → 5 (Hidden Single)
  13. Row 9 / Column 7 → 8 (Hidden Single)
  14. Row 3 / Column 7 → 9 (Hidden Single)
  15. Row 3 / Column 5 → 8 (Hidden Single)
  16. Row 2 / Column 5 → 5 (Hidden Single)
  17. Row 6 / Column 3 → 2 (Hidden Single)
  18. Row 6 / Column 4 → 6 (Naked Single)
  19. Row 4 / Column 4 → 2 (Full House)
  20. Row 5 / Column 9 → 6 (Hidden Single)
  21. Row 4 / Column 2 → 6 (Hidden Single)
  22. Row 7 / Column 1 → 6 (Hidden Single)
  23. Row 2 / Column 3 → 6 (Hidden Single)
  24. Row 4 / Column 5 → 1 (Hidden Single)
  25. Row 9 / Column 5 → 6 (Hidden Single)
  26. Row 9 / Column 9 → 2 (Hidden Single)
  27. Row 7 / Column 5 → 2 (Hidden Single)
  28. Row 7 / Column 6 → 7 (Hidden Single)
  29. Locked Candidates Type 1 (Pointing): 1 in b6 => r7c7<>1
  30. Locked Candidates Type 1 (Pointing): 4 in b8 => r8c239<>4
  31. Locked Candidates Type 1 (Pointing): 9 in b8 => r8c23<>9
  32. Locked Candidates Type 1 (Pointing): 4 in b9 => r7c23<>4
  33. Locked Candidates Type 2 (Claiming): 8 in r5 => r6c2<>8
  34. X-Wing: 3 c68 r26 => r2c2,r6c57<>3
  35. Locked Candidates Type 1 (Pointing): 3 in b1 => r78c3<>3
  36. Naked Triple: 1,4,7 in r6c257 => r6c68<>4
  37. XYZ-Wing: 1/4/7 in r5c1,r69c2 => r5c2<>4
  38. Hidden Rectangle: 1/8 in r5c23,r8c23 => r5c2<>1
  39. Multi Colors 1: 4 (r2c2,r3c9,r4c8,r7c7,r8c6) / (r2c8,r4c6,r7c9,r8c5), (r3c1) / (r5c1) => r5c5<>4
  40. XY-Chain: 1 1- r7c3 -9- r1c3 -3- r1c5 -9- r2c6 -3- r2c8 -4- r3c9 -3- r8c9 -1 => r7c9,r8c23<>1
  41. Row 8 / Column 3 → 8 (Naked Single)
  42. Row 8 / Column 2 → 3 (Naked Single)
  43. Row 8 / Column 9 → 1 (Naked Single)
  44. Row 5 / Column 2 → 8 (Hidden Single)
  45. XY-Chain: 1 1- r6c7 -4- r4c8 -8- r6c8 -3- r2c8 -4- r2c2 -9- r7c2 -1 => r6c2<>1
  46. Row 6 / Column 7 → 1 (Hidden Single)
  47. Row 7 / Column 2 → 1 (Hidden Single)
  48. Row 7 / Column 3 → 9 (Naked Single)
  49. Row 1 / Column 3 → 3 (Naked Single)
  50. Row 1 / Column 5 → 9 (Full House)
  51. Row 2 / Column 6 → 3 (Full House)
  52. Row 8 / Column 5 → 4 (Naked Single)
  53. Row 8 / Column 6 → 9 (Full House)
  54. Row 2 / Column 8 → 4 (Naked Single)
  55. Row 2 / Column 2 → 9 (Full House)
  56. Row 3 / Column 9 → 3 (Full House)
  57. Row 7 / Column 9 → 4 (Full House)
  58. Row 7 / Column 7 → 3 (Full House)
  59. Row 5 / Column 7 → 4 (Full House)
  60. Row 6 / Column 6 → 8 (Naked Single)
  61. Row 4 / Column 6 → 4 (Full House)
  62. Row 4 / Column 8 → 8 (Full House)
  63. Row 6 / Column 8 → 3 (Full House)
  64. Row 6 / Column 5 → 7 (Naked Single)
  65. Row 5 / Column 5 → 3 (Full House)
  66. Row 6 / Column 2 → 4 (Full House)
  67. Row 9 / Column 2 → 7 (Full House)
  68. Row 9 / Column 3 → 4 (Full House)
  69. Row 5 / Column 1 → 1 (Naked Single)
  70. Row 3 / Column 1 → 4 (Full House)
  71. Row 3 / Column 3 → 1 (Full House)
  72. Row 5 / Column 3 → 7 (Full House)
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