Solution for Evil Sudoku #1287713524895

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

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.

Naked Single Explanation
Hidden Single Explanation
Locked Candidates Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 2 / Column 4 → 7 (Hidden Single)
  2. Row 8 / Column 8 → 8 (Hidden Single)
  3. Row 5 / Column 1 → 1 (Hidden Single)
  4. Row 5 / Column 9 → 7 (Hidden Single)
  5. Row 7 / Column 1 → 4 (Hidden Single)
  6. Locked Candidates Type 1 (Pointing): 1 in b2 => r3c9<>1
  7. Locked Candidates Type 1 (Pointing): 5 in b7 => r9c5<>5
  8. Locked Candidates Type 2 (Claiming): 3 in c1 => r8c23,r9c2<>3
  9. Naked Quadruple: 2,3,6,9 in r789c7,r9c9 => r7c89<>2, r7c89<>6, r7c89<>9
  10. Row 7 / Column 8 → 1 (Naked Single)
  11. Row 7 / Column 9 → 1 (Naked Single)
  12. Locked Triple: 5,6,9 in r2c789 => r1c8,r2c23<>5, r1c89,r2c23,r3c9<>6, r1c89,r2c23,r3c9<>9
  13. Row 2 / Column 2 → 3 (Naked Single)
  14. Row 2 / Column 3 → 3 (Naked Single)
  15. Row 1 / Column 8 → 2 (Naked Single)
  16. Row 1 / Column 9 → 4 (Naked Single)
  17. Row 3 / Column 9 → 4 (Naked Single)
  18. Row 4 / Column 6 → 3 (Hidden Single)
  19. Row 9 / Column 9 → 2 (Hidden Single)
  20. Row 6 / Column 6 → 4 (Hidden Single)
  21. Row 7 / Column 4 → 2 (Hidden Single)
  22. Row 2 / Column 9 → 6 (Hidden Single)
  23. Row 5 / Column 7 → 4 (Hidden Single)
  24. Row 6 / Column 4 → 1 (Hidden Single)
  25. Row 3 / Column 6 → 1 (Hidden Single)
  26. Row 4 / Column 2 → 4 (Hidden Single)
  27. Row 6 / Column 7 → 2 (Hidden Single)
  28. Row 2 / Column 7 → 5 (Hidden Single)
  29. Row 2 / Column 8 → 9 (Naked Single)
  30. Row 5 / Column 8 → 6 (Naked Single)
  31. Row 4 / Column 8 → 5 (Full House)
  32. Row 6 / Column 8 → 5 (Full House)
  33. Row 5 / Column 5 → 9 (Naked Single)
  34. Row 4 / Column 4 → 6 (Full House)
  35. Row 5 / Column 2 → 2 (Full House)
  36. Row 5 / Column 3 → 2 (Full House)
  37. Row 4 / Column 3 → 9 (Full House)
  38. Row 6 / Column 2 → 6 (Naked Single)
  39. Row 8 / Column 3 → 6 (Naked Single)
  40. Row 8 / Column 2 → 9 (Naked Single)
  41. Row 3 / Column 2 → 5 (Full House)
  42. Row 9 / Column 2 → 5 (Full House)
  43. Row 1 / Column 3 → 5 (Naked Single)
  44. Row 3 / Column 3 → 5 (Naked Single)
  45. Row 8 / Column 6 → 9 (Naked Single)
  46. Row 8 / Column 7 → 3 (Naked Single)
  47. Row 9 / Column 1 → 3 (Naked Single)
  48. Row 1 / Column 5 → 6 (Naked Single)
  49. Row 1 / Column 6 → 6 (Naked Single)
  50. Row 9 / Column 4 → 8 (Naked Single)
  51. Row 3 / Column 4 → 9 (Full House)
  52. Row 8 / Column 1 → 2 (Naked Single)
  53. Row 1 / Column 1 → 9 (Naked Single)
  54. Row 3 / Column 1 → 6 (Full House)
  55. Row 3 / Column 5 → 8 (Naked Single)
  56. Row 9 / Column 5 → 8 (Naked Single)
  57. Row 7 / Column 6 → 5 (Naked Single)
  58. Row 7 / Column 5 → 3 (Naked Single)
  59. Row 7 / Column 7 → 9 (Hidden Single)
  60. Row 9 / Column 7 → 6 (Full House)
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