Solution for Evil Sudoku #1224713524895

1
8
3
4
2
2
7
3
7
2
4
2
5
8
7
1
2
3
7
8
1
4
1
4
5
4

This Sudoku Puzzle has 63 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Triple, Naked Single, Locked Triple, Full House techniques.

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Solution Steps:

  1. Row 5 / Column 1 → 1 (Hidden Single)
  2. Row 3 / Column 2 → 4 (Hidden Single)
  3. Row 7 / Column 1 → 4 (Hidden Single)
  4. Row 5 / Column 7 → 4 (Hidden Single)
  5. Row 1 / Column 9 → 4 (Hidden Single)
  6. Row 3 / Column 3 → 2 (Hidden Single)
  7. Locked Candidates Type 1 (Pointing): 5 in b7 => r9c5<>5
  8. Locked Candidates Type 1 (Pointing): 8 in b8 => r9c79<>8
  9. Row 3 / Column 9 → 8 (Hidden Single)
  10. Row 1 / Column 5 → 8 (Hidden Single)
  11. Row 9 / Column 4 → 8 (Hidden Single)
  12. Row 9 / Column 2 → 2 (Hidden Single)
  13. Row 7 / Column 4 → 2 (Hidden Single)
  14. Row 9 / Column 9 → 7 (Hidden Single)
  15. Row 2 / Column 4 → 7 (Hidden Single)
  16. Row 8 / Column 6 → 7 (Hidden Single)
  17. Row 8 / Column 8 → 2 (Hidden Single)
  18. Row 9 / Column 1 → 5 (Hidden Single)
  19. Row 5 / Column 8 → 7 (Hidden Single)
  20. Row 1 / Column 3 → 7 (Hidden Single)
  21. Row 8 / Column 7 → 8 (Hidden Single)
  22. Row 8 / Column 1 → 3 (Hidden Single)
  23. Locked Candidates Type 1 (Pointing): 5 in b1 => r2c78<>5
  24. Row 6 / Column 7 → 5 (Hidden Single)
  25. Row 1 / Column 8 → 5 (Hidden Single)
  26. Locked Candidates Type 1 (Pointing): 6 in b3 => r2c23<>6
  27. Locked Candidates Type 1 (Pointing): 9 in b3 => r2c23<>9
  28. Naked Triple: 3,6,9 in r4c46,r5c5 => r6c46<>6, r6c46<>9
  29. Row 6 / Column 4 → 1 (Naked Single)
  30. Row 6 / Column 6 → 1 (Naked Single)
  31. Locked Triple: 5,6,9 in r3c456 => r1c6,r3c1<>6, r1c6,r3c1<>9
  32. Row 3 / Column 1 → 9 (Naked Single)
  33. Row 1 / Column 6 → 9 (Naked Single)
  34. Row 1 / Column 1 → 6 (Naked Single)
  35. Row 3 / Column 4 → 6 (Naked Single)
  36. Row 4 / Column 4 → 9 (Full House)
  37. Row 3 / Column 5 → 5 (Naked Single)
  38. Row 3 / Column 6 → 5 (Naked Single)
  39. Naked Triple: 3,6,9 in r5c235 => r5c9<>6, r5c9<>9
  40. Row 5 / Column 9 → 9 (Naked Single)
  41. Row 8 / Column 3 → 9 (Hidden Single)
  42. Row 8 / Column 2 → 6 (Full House)
  43. Row 5 / Column 2 → 3 (Naked Single)
  44. Row 2 / Column 2 → 5 (Naked Single)
  45. Row 5 / Column 3 → 6 (Naked Single)
  46. Row 5 / Column 5 → 6 (Naked Single)
  47. Row 2 / Column 3 → 3 (Naked Single)
  48. Row 4 / Column 3 → 5 (Full House)
  49. Row 4 / Column 2 → 8 (Naked Single)
  50. Row 6 / Column 2 → 9 (Full House)
  51. Row 4 / Column 6 → 3 (Naked Single)
  52. Row 4 / Column 8 → 6 (Full House)
  53. Row 7 / Column 6 → 6 (Naked Single)
  54. Row 6 / Column 8 → 8 (Naked Single)
  55. Row 7 / Column 9 → 1 (Naked Single)
  56. Row 2 / Column 9 → 6 (Naked Single)
  57. Row 7 / Column 8 → 9 (Naked Single)
  58. Row 2 / Column 8 → 1 (Full House)
  59. Row 2 / Column 7 → 9 (Full House)
  60. Row 7 / Column 5 → 3 (Full House)
  61. Row 7 / Column 7 → 3 (Full House)
  62. Row 9 / Column 5 → 9 (Full House)
  63. Row 9 / Column 7 → 6 (Full House)
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