Solution for Evil Sudoku #1225713524895

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

This Sudoku Puzzle has 64 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Locked Pair, Naked Single, Full House techniques.

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Solution Steps:

  1. Row 4 / Column 8 → 5 (Hidden Single)
  2. Row 2 / Column 7 → 5 (Hidden Single)
  3. Row 5 / Column 1 → 1 (Hidden Single)
  4. Row 7 / Column 1 → 5 (Hidden Single)
  5. Row 4 / Column 2 → 8 (Hidden Single)
  6. Row 3 / Column 2 → 5 (Hidden Single)
  7. Row 1 / Column 5 → 5 (Hidden Single)
  8. Row 3 / Column 3 → 2 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 8 in b2 => r3c9<>8
  10. Locked Candidates Type 1 (Pointing): 4 in b3 => r5c9<>4
  11. Locked Candidates Type 1 (Pointing): 8 in b8 => r9c79<>8
  12. Row 1 / Column 9 → 8 (Hidden Single)
  13. Row 3 / Column 9 → 4 (Hidden Single)
  14. Row 1 / Column 1 → 4 (Hidden Single)
  15. Locked Candidates Type 1 (Pointing): 1 in b3 => r2c4<>1
  16. Locked Candidates Type 2 (Claiming): 3 in c1 => r8c23,r9c2<>3
  17. Locked Candidates Type 2 (Claiming): 4 in c2 => r45c3<>4
  18. Row 4 / Column 6 → 4 (Hidden Single)
  19. Row 4 / Column 3 → 3 (Hidden Single)
  20. Row 5 / Column 5 → 3 (Hidden Single)
  21. Row 2 / Column 2 → 3 (Hidden Single)
  22. Row 4 / Column 4 → 6 (Hidden Single)
  23. Locked Candidates Type 1 (Pointing): 9 in b5 => r6c278<>9
  24. Locked Candidates Type 1 (Pointing): 9 in b4 => r5c789<>9
  25. Locked Pair: 6,7 in r5c89 => r5c237,r6c78<>6
  26. Row 5 / Column 3 → 9 (Naked Single)
  27. Row 5 / Column 7 → 4 (Naked Single)
  28. Row 6 / Column 8 → 8 (Naked Single)
  29. Row 5 / Column 2 → 4 (Naked Single)
  30. Row 8 / Column 3 → 6 (Naked Single)
  31. Row 1 / Column 3 → 7 (Full House)
  32. Row 2 / Column 3 → 7 (Full House)
  33. Row 6 / Column 7 → 8 (Naked Single)
  34. Row 6 / Column 2 → 6 (Naked Single)
  35. Row 2 / Column 4 → 9 (Naked Single)
  36. Row 1 / Column 6 → 6 (Naked Single)
  37. Row 1 / Column 8 → 9 (Full House)
  38. Row 6 / Column 4 → 1 (Naked Single)
  39. Row 6 / Column 6 → 9 (Full House)
  40. Row 7 / Column 4 → 2 (Naked Single)
  41. Row 3 / Column 5 → 8 (Naked Single)
  42. Row 3 / Column 6 → 1 (Naked Single)
  43. Row 3 / Column 4 → 8 (Full House)
  44. Row 7 / Column 6 → 3 (Naked Single)
  45. Row 8 / Column 6 → 7 (Full House)
  46. Row 9 / Column 4 → 7 (Naked Single)
  47. Row 8 / Column 8 → 2 (Naked Single)
  48. Row 8 / Column 2 → 9 (Naked Single)
  49. Row 8 / Column 1 → 3 (Full House)
  50. Row 8 / Column 7 → 3 (Full House)
  51. Row 9 / Column 1 → 3 (Naked Single)
  52. Row 9 / Column 2 → 2 (Naked Single)
  53. Row 3 / Column 1 → 9 (Hidden Single)
  54. Row 5 / Column 8 → 7 (Hidden Single)
  55. Row 5 / Column 9 → 6 (Naked Single)
  56. Row 2 / Column 9 → 1 (Naked Single)
  57. Row 9 / Column 9 → 9 (Full House)
  58. Row 2 / Column 8 → 6 (Full House)
  59. Row 7 / Column 9 → 9 (Full House)
  60. Row 9 / Column 5 → 6 (Full House)
  61. Row 7 / Column 8 → 1 (Full House)
  62. Row 7 / Column 5 → 6 (Full House)
  63. Row 7 / Column 7 → 6 (Naked Single)
  64. Row 9 / Column 7 → 6 (Naked Single)
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