Solution for Evil Sudoku #4252138497640

5
4
3
1
7
1
5
3
4
1
8
9
2
2
6
5
4
9
4
1
8
2
3
2
5
7

This Sudoku Puzzle has 61 steps and it is solved using Naked Single, Hidden Single, Full House, Locked Candidates Type 1 (Pointing), Naked Triple, Hidden Pair, Skyscraper, Uniqueness Test 1 techniques.

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Solution Steps:

  1. Row 4 / Column 8 → 9 (Naked Single)
  2. Row 4 / Column 7 → 7 (Naked Single)
  3. Row 1 / Column 9 → 1 (Hidden Single)
  4. Row 5 / Column 9 → 3 (Hidden Single)
  5. Row 2 / Column 7 → 5 (Hidden Single)
  6. Row 5 / Column 2 → 4 (Hidden Single)
  7. Row 7 / Column 7 → 4 (Hidden Single)
  8. Row 8 / Column 3 → 1 (Hidden Single)
  9. Row 8 / Column 8 → 6 (Naked Single)
  10. Row 9 / Column 9 → 8 (Naked Single)
  11. Row 7 / Column 9 → 9 (Naked Single)
  12. Row 9 / Column 7 → 1 (Full House)
  13. Row 6 / Column 7 → 8 (Naked Single)
  14. Row 3 / Column 7 → 9 (Full House)
  15. Row 5 / Column 8 → 1 (Full House)
  16. Row 6 / Column 2 → 3 (Hidden Single)
  17. Row 8 / Column 2 → 7 (Naked Single)
  18. Row 8 / Column 1 → 3 (Naked Single)
  19. Row 6 / Column 5 → 1 (Hidden Single)
  20. Row 1 / Column 1 → 9 (Hidden Single)
  21. Row 2 / Column 9 → 7 (Hidden Single)
  22. Row 3 / Column 9 → 6 (Full House)
  23. Row 7 / Column 6 → 7 (Hidden Single)
  24. Locked Candidates Type 1 (Pointing): 6 in b4 => r17c3<>6
  25. Row 2 / Column 2 → 6 (Hidden Single)
  26. Row 7 / Column 2 → 2 (Full House)
  27. Naked Triple: 2,7,8 in r3c138 => r3c4<>2, r3c5<>8
  28. Hidden Pair: 2,8 in r15c6 => r1c6<>6
  29. Row 1 / Column 4 → 6 (Hidden Single)
  30. Naked Triple: 3,4,5 in r349c4 => r5c4<>5
  31. Skyscraper: 5 in r5c5,r9c4 (connected by r59c1) => r4c4,r7c5<>5
  32. Row 7 / Column 5 → 6 (Naked Single)
  33. Row 9 / Column 6 → 3 (Naked Single)
  34. Row 9 / Column 4 → 5 (Naked Single)
  35. Row 9 / Column 1 → 6 (Full House)
  36. Uniqueness Test 1: 3/4 in r3c45,r4c45 => r4c5<>3, r4c5<>4
  37. Row 4 / Column 5 → 5 (Naked Single)
  38. Row 4 / Column 3 → 6 (Naked Single)
  39. Row 5 / Column 5 → 8 (Naked Single)
  40. Row 4 / Column 6 → 4 (Naked Single)
  41. Row 4 / Column 4 → 3 (Full House)
  42. Row 6 / Column 3 → 7 (Naked Single)
  43. Row 5 / Column 1 → 5 (Full House)
  44. Row 2 / Column 5 → 9 (Naked Single)
  45. Row 5 / Column 6 → 2 (Naked Single)
  46. Row 5 / Column 4 → 7 (Full House)
  47. Row 8 / Column 6 → 9 (Naked Single)
  48. Row 8 / Column 5 → 4 (Full House)
  49. Row 3 / Column 5 → 3 (Full House)
  50. Row 3 / Column 4 → 4 (Naked Single)
  51. Row 6 / Column 4 → 9 (Naked Single)
  52. Row 2 / Column 4 → 2 (Full House)
  53. Row 1 / Column 6 → 8 (Full House)
  54. Row 6 / Column 6 → 6 (Full House)
  55. Row 2 / Column 8 → 8 (Full House)
  56. Row 1 / Column 3 → 2 (Full House)
  57. Row 3 / Column 8 → 2 (Full House)
  58. Row 7 / Column 1 → 8 (Naked Single)
  59. Row 3 / Column 1 → 7 (Full House)
  60. Row 3 / Column 3 → 8 (Full House)
  61. Row 7 / Column 3 → 5 (Full House)
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