Solution for Evil Sudoku #1388713524895

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

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

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Solution Steps:

  1. Row 1 / Column 5 → 1 (Hidden Single)
  2. Row 4 / Column 7 → 8 (Hidden Single)
  3. Row 1 / Column 3 → 4 (Hidden Single)
  4. Row 8 / Column 2 → 8 (Hidden Single)
  5. Row 8 / Column 5 → 7 (Hidden Single)
  6. Row 6 / Column 2 → 7 (Hidden Single)
  7. Row 9 / Column 1 → 7 (Hidden Single)
  8. Row 4 / Column 8 → 7 (Hidden Single)
  9. Row 3 / Column 9 → 7 (Hidden Single)
  10. Row 4 / Column 4 → 1 (Hidden Single)
  11. Row 6 / Column 7 → 1 (Hidden Single)
  12. Row 9 / Column 9 → 4 (Hidden Single)
  13. Locked Candidates Type 1 (Pointing): 5 in b1 => r5c1<>5
  14. Locked Candidates Type 2 (Claiming): 3 in r1 => r2c12,r3c2<>3
  15. Naked Quadruple: 3,5,6,9 in r5c1357 => r5c9<>5, r5c9<>6, r5c9<>9
  16. Row 5 / Column 9 → 9 (Naked Single)
  17. Naked Pair: 3,6 in r5c15 => r5c3<>3, r5c37<>6
  18. Row 5 / Column 3 → 5 (Naked Single)
  19. Row 5 / Column 7 → 5 (Naked Single)
  20. Row 6 / Column 9 → 6 (Naked Single)
  21. Hidden Pair: 4,5 in r23c7 => r23c7<>2, r23c7<>6, r23c7<>9
  22. Row 2 / Column 7 → 4 (Naked Single)
  23. Row 3 / Column 7 → 4 (Naked Single)
  24. Row 7 / Column 5 → 4 (Hidden Single)
  25. Row 6 / Column 6 → 4 (Hidden Single)
  26. Row 6 / Column 4 → 9 (Naked Single)
  27. Row 6 / Column 3 → 3 (Full House)
  28. Row 4 / Column 6 → 6 (Naked Single)
  29. Row 5 / Column 5 → 3 (Full House)
  30. Row 5 / Column 1 → 6 (Naked Single)
  31. Locked Candidates Type 1 (Pointing): 6 in b1 => r7c2<>6
  32. Locked Candidates Type 1 (Pointing): 2 in b3 => r1c12<>2
  33. Hidden Pair: 2,4 in r1c79 => r1c7<>6, r1c7<>9, r1c9<>5
  34. Row 1 / Column 7 → 2 (Naked Single)
  35. Row 1 / Column 9 → 2 (Naked Single)
  36. Row 8 / Column 9 → 5 (Naked Single)
  37. Row 8 / Column 6 → 9 (Naked Single)
  38. Row 1 / Column 2 → 6 (Hidden Single)
  39. Row 9 / Column 7 → 6 (Hidden Single)
  40. Row 7 / Column 8 → 9 (Naked Single)
  41. Row 8 / Column 8 → 1 (Full House)
  42. Row 9 / Column 8 → 1 (Full House)
  43. Row 9 / Column 5 → 2 (Naked Single)
  44. Row 8 / Column 4 → 6 (Naked Single)
  45. Row 7 / Column 4 → 5 (Full House)
  46. Row 8 / Column 3 → 2 (Full House)
  47. Row 2 / Column 4 → 2 (Full House)
  48. Row 9 / Column 3 → 9 (Naked Single)
  49. Row 4 / Column 3 → 9 (Naked Single)
  50. Row 7 / Column 1 → 3 (Naked Single)
  51. Row 7 / Column 2 → 3 (Naked Single)
  52. Row 7 / Column 3 → 6 (Naked Single)
  53. Row 2 / Column 2 → 9 (Naked Single)
  54. Row 4 / Column 1 → 2 (Naked Single)
  55. Row 1 / Column 1 → 5 (Full House)
  56. Row 2 / Column 1 → 5 (Full House)
  57. Row 2 / Column 5 → 6 (Naked Single)
  58. Row 3 / Column 5 → 9 (Full House)
  59. Row 3 / Column 2 → 2 (Naked Single)
  60. Row 2 / Column 6 → 3 (Naked Single)
  61. Row 3 / Column 6 → 5 (Full House)
  62. Row 2 / Column 8 → 3 (Naked Single)
  63. Row 3 / Column 8 → 6 (Naked Single)
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