Solution for Evil Sudoku #1285713524895

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

This Sudoku Puzzle has 63 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Naked Single, Locked Pair, Full House techniques.

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Solution Steps:

  1. Row 4 / Column 8 → 5 (Hidden Single)
  2. Row 8 / Column 8 → 8 (Hidden Single)
  3. Row 2 / Column 7 → 5 (Hidden Single)
  4. Row 5 / Column 1 → 1 (Hidden Single)
  5. Row 7 / Column 1 → 5 (Hidden Single)
  6. Row 8 / Column 6 → 7 (Hidden Single)
  7. Row 5 / Column 8 → 7 (Hidden Single)
  8. Row 9 / Column 9 → 7 (Hidden Single)
  9. Row 3 / Column 2 → 5 (Hidden Single)
  10. Row 1 / Column 5 → 5 (Hidden Single)
  11. Row 1 / Column 3 → 7 (Hidden Single)
  12. Row 2 / Column 4 → 7 (Hidden Single)
  13. Locked Candidates Type 1 (Pointing): 1 in b2 => r3c9<>1
  14. Locked Candidates Type 1 (Pointing): 4 in b3 => r5c9<>4
  15. Locked Candidates Type 2 (Claiming): 3 in c1 => r8c23,r9c2<>3
  16. Locked Candidates Type 2 (Claiming): 4 in c1 => r3c3<>4
  17. Locked Candidates Type 2 (Claiming): 4 in c2 => r45c3<>4
  18. Naked Triple: 2,6,9 in r8c23,r9c2 => r89c1<>2, r89c1<>6, r89c1<>9
  19. Row 8 / Column 1 → 3 (Naked Single)
  20. Row 9 / Column 1 → 3 (Naked Single)
  21. Row 7 / Column 7 → 3 (Hidden Single)
  22. Row 5 / Column 5 → 3 (Hidden Single)
  23. Locked Pair: 6,9 in r7c56 => r7c489,r9c45<>6, r7c489,r9c45<>9
  24. Row 7 / Column 4 → 2 (Naked Single)
  25. Row 9 / Column 5 → 8 (Naked Single)
  26. Row 7 / Column 8 → 1 (Naked Single)
  27. Row 7 / Column 9 → 1 (Naked Single)
  28. Row 9 / Column 4 → 8 (Naked Single)
  29. Locked Pair: 6,9 in r2c89 => r1c89,r2c23,r3c9<>6, r1c89,r2c23,r3c9<>9
  30. Row 2 / Column 2 → 3 (Naked Single)
  31. Row 2 / Column 3 → 3 (Naked Single)
  32. Row 1 / Column 8 → 2 (Naked Single)
  33. Row 1 / Column 9 → 4 (Naked Single)
  34. Row 3 / Column 9 → 4 (Naked Single)
  35. Row 3 / Column 1 → 2 (Hidden Single)
  36. Row 5 / Column 9 → 2 (Hidden Single)
  37. Row 1 / Column 1 → 6 (Hidden Single)
  38. Row 1 / Column 6 → 9 (Full House)
  39. Row 3 / Column 3 → 9 (Naked Single)
  40. Row 3 / Column 5 → 6 (Naked Single)
  41. Row 3 / Column 4 → 1 (Full House)
  42. Row 3 / Column 6 → 1 (Full House)
  43. Row 7 / Column 5 → 9 (Full House)
  44. Row 7 / Column 6 → 6 (Naked Single)
  45. Row 4 / Column 3 → 6 (Naked Single)
  46. Row 5 / Column 3 → 6 (Naked Single)
  47. Row 4 / Column 6 → 4 (Naked Single)
  48. Row 4 / Column 4 → 9 (Full House)
  49. Row 4 / Column 2 → 9 (Full House)
  50. Row 6 / Column 6 → 4 (Naked Single)
  51. Row 8 / Column 3 → 2 (Naked Single)
  52. Row 6 / Column 4 → 6 (Naked Single)
  53. Row 5 / Column 2 → 4 (Naked Single)
  54. Row 6 / Column 7 → 9 (Full House)
  55. Row 8 / Column 2 → 6 (Full House)
  56. Row 6 / Column 8 → 9 (Full House)
  57. Row 5 / Column 7 → 9 (Full House)
  58. Row 8 / Column 7 → 6 (Full House)
  59. Row 6 / Column 2 → 2 (Naked Single)
  60. Row 9 / Column 2 → 6 (Naked Single)
  61. Row 2 / Column 8 → 6 (Naked Single)
  62. Row 9 / Column 7 → 2 (Naked Single)
  63. Row 2 / Column 9 → 9 (Naked Single)
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