Solution for Evil Sudoku #1387713524895

7
1
8
8
7
7
8
1
4
1
7
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, Locked Triple, Full House techniques.

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Solution Steps:

  1. Row 1 / Column 5 → 1 (Hidden Single)
  2. Row 4 / Column 8 → 7 (Hidden Single)
  3. Row 1 / Column 3 → 4 (Hidden Single)
  4. Row 9 / Column 5 → 7 (Hidden Single)
  5. Row 8 / Column 2 → 7 (Hidden Single)
  6. Locked Candidates Type 1 (Pointing): 5 in b1 => r5c1<>5
  7. Locked Candidates Type 1 (Pointing): 1 in b6 => r9c7<>1
  8. Locked Candidates Type 2 (Claiming): 3 in r1 => r2c12,r3c2<>3
  9. Naked Quadruple: 2,3,6,9 in r7c123,r9c1 => r89c3<>2, r89c3<>6, r89c3<>9
  10. Row 8 / Column 3 → 1 (Naked Single)
  11. Row 9 / Column 3 → 1 (Naked Single)
  12. Locked Triple: 5,6,9 in r789c8 => r23c8,r8c9<>5, r23c8,r89c9,r9c7<>6, r23c8,r89c9,r9c7<>9
  13. Row 2 / Column 8 → 3 (Naked Single)
  14. Row 3 / Column 8 → 3 (Naked Single)
  15. Row 8 / Column 9 → 2 (Naked Single)
  16. Row 9 / Column 7 → 4 (Naked Single)
  17. Row 9 / Column 9 → 4 (Naked Single)
  18. Row 5 / Column 5 → 3 (Hidden Single)
  19. Row 9 / Column 1 → 2 (Hidden Single)
  20. Row 4 / Column 3 → 2 (Hidden Single)
  21. Row 9 / Column 8 → 6 (Hidden Single)
  22. Locked Triple: 5,6,9 in r8c456 => r7c4,r8c8<>5, r7c45,r8c8<>9, r7c45<>6
  23. Row 8 / Column 8 → 9 (Naked Single)
  24. Row 7 / Column 8 → 5 (Naked Single)
  25. Row 8 / Column 5 → 6 (Naked Single)
  26. Row 8 / Column 4 → 5 (Naked Single)
  27. Row 8 / Column 6 → 5 (Naked Single)
  28. Locked Candidates Type 2 (Claiming): 4 in r2 => r3c56<>4
  29. Locked Candidates Type 2 (Claiming): 5 in r3 => r1c79,r2c7<>5
  30. Row 1 / Column 1 → 5 (Hidden Single)
  31. Row 1 / Column 2 → 3 (Hidden Single)
  32. Row 7 / Column 1 → 3 (Hidden Single)
  33. Row 6 / Column 3 → 3 (Hidden Single)
  34. Row 1 / Column 7 → 2 (Hidden Single)
  35. Row 5 / Column 3 → 5 (Hidden Single)
  36. Row 1 / Column 9 → 6 (Hidden Single)
  37. Row 2 / Column 7 → 9 (Naked Single)
  38. Row 5 / Column 9 → 9 (Naked Single)
  39. Row 2 / Column 1 → 6 (Naked Single)
  40. Row 3 / Column 7 → 5 (Naked Single)
  41. Row 3 / Column 9 → 5 (Naked Single)
  42. Row 6 / Column 9 → 5 (Naked Single)
  43. Row 2 / Column 2 → 2 (Naked Single)
  44. Row 2 / Column 6 → 4 (Full House)
  45. Row 2 / Column 4 → 4 (Full House)
  46. Row 2 / Column 5 → 4 (Full House)
  47. Row 3 / Column 2 → 9 (Full House)
  48. Row 6 / Column 2 → 6 (Full House)
  49. Row 7 / Column 2 → 6 (Full House)
  50. Row 5 / Column 1 → 8 (Naked Single)
  51. Row 4 / Column 1 → 9 (Full House)
  52. Row 5 / Column 7 → 6 (Full House)
  53. Row 7 / Column 4 → 2 (Naked Single)
  54. Row 7 / Column 5 → 2 (Naked Single)
  55. Row 3 / Column 5 → 2 (Naked Single)
  56. Row 3 / Column 6 → 6 (Naked Single)
  57. Row 6 / Column 6 → 9 (Naked Single)
  58. Row 6 / Column 7 → 1 (Naked Single)
  59. Row 4 / Column 7 → 8 (Full House)
  60. Row 7 / Column 3 → 9 (Naked Single)
  61. Row 4 / Column 6 → 6 (Naked Single)
  62. Row 6 / Column 4 → 1 (Naked Single)
  63. Row 4 / Column 4 → 1 (Naked Single)
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