Solution for Evil Sudoku #1187713524895

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

This Sudoku Puzzle has 60 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 6 / Column 2 → 7 (Hidden Single)
  2. Row 2 / Column 8 → 8 (Hidden Single)
  3. Row 9 / Column 5 → 1 (Hidden Single)
  4. Row 1 / Column 5 → 7 (Hidden Single)
  5. Row 9 / Column 7 → 4 (Hidden Single)
  6. Locked Candidates Type 1 (Pointing): 1 in b4 => r1c3<>1
  7. Locked Candidates Type 1 (Pointing): 5 in b9 => r5c9<>5
  8. Locked Candidates Type 2 (Claiming): 3 in r9 => r78c8,r8c9<>3
  9. Naked Quadruple: 2,3,6,9 in r13c9,r3c78 => r12c7<>2, r12c7<>6, r12c7<>9
  10. Row 1 / Column 7 → 1 (Naked Single)
  11. Row 2 / Column 7 → 1 (Naked Single)
  12. Locked Triple: 5,6,9 in r123c2 => r2c1,r78c2<>5, r1c13,r2c1,r78c2<>6, r1c13,r2c1,r78c2<>9
  13. Row 7 / Column 2 → 3 (Naked Single)
  14. Row 8 / Column 2 → 3 (Naked Single)
  15. Row 2 / Column 1 → 2 (Naked Single)
  16. Row 1 / Column 1 → 4 (Naked Single)
  17. Row 1 / Column 3 → 4 (Naked Single)
  18. Row 4 / Column 4 → 3 (Hidden Single)
  19. Row 1 / Column 9 → 2 (Hidden Single)
  20. Row 4 / Column 6 → 4 (Hidden Single)
  21. Row 6 / Column 7 → 2 (Hidden Single)
  22. Row 1 / Column 2 → 6 (Hidden Single)
  23. Row 3 / Column 5 → 4 (Hidden Single)
  24. Row 4 / Column 3 → 1 (Hidden Single)
  25. Row 6 / Column 6 → 1 (Hidden Single)
  26. Row 7 / Column 4 → 4 (Hidden Single)
  27. Row 3 / Column 6 → 2 (Hidden Single)
  28. Row 3 / Column 2 → 5 (Hidden Single)
  29. Row 2 / Column 2 → 9 (Naked Single)
  30. Row 2 / Column 5 → 6 (Naked Single)
  31. Row 2 / Column 4 → 5 (Full House)
  32. Row 2 / Column 6 → 5 (Full House)
  33. Row 5 / Column 5 → 9 (Naked Single)
  34. Row 6 / Column 4 → 6 (Full House)
  35. Row 7 / Column 5 → 2 (Full House)
  36. Row 8 / Column 5 → 2 (Full House)
  37. Row 8 / Column 4 → 9 (Full House)
  38. Row 8 / Column 6 → 6 (Naked Single)
  39. Row 8 / Column 8 → 6 (Naked Single)
  40. Row 8 / Column 3 → 5 (Naked Single)
  41. Row 8 / Column 9 → 5 (Naked Single)
  42. Row 4 / Column 8 → 9 (Naked Single)
  43. Row 7 / Column 8 → 9 (Naked Single)
  44. Row 3 / Column 8 → 3 (Naked Single)
  45. Row 6 / Column 9 → 8 (Naked Single)
  46. Row 6 / Column 3 → 9 (Full House)
  47. Row 7 / Column 1 → 6 (Naked Single)
  48. Row 7 / Column 3 → 6 (Naked Single)
  49. Row 9 / Column 9 → 3 (Naked Single)
  50. Row 9 / Column 8 → 2 (Naked Single)
  51. Row 4 / Column 1 → 5 (Naked Single)
  52. Row 4 / Column 7 → 6 (Full House)
  53. Row 5 / Column 1 → 5 (Naked Single)
  54. Row 9 / Column 1 → 9 (Naked Single)
  55. Row 9 / Column 3 → 2 (Full House)
  56. Row 5 / Column 3 → 8 (Naked Single)
  57. Row 5 / Column 9 → 6 (Naked Single)
  58. Row 3 / Column 7 → 9 (Full House)
  59. Row 3 / Column 9 → 9 (Full House)
  60. Row 5 / Column 7 → 3 (Naked Single)
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