Solution for Evil Sudoku #4489763452140

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

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 6 / Column 2 → 5 (Naked Single)
  2. Row 6 / Column 3 → 2 (Naked Single)
  3. Row 2 / Column 7 → 7 (Hidden Single)
  4. Row 2 / Column 2 → 1 (Naked Single)
  5. Row 5 / Column 8 → 4 (Hidden Single)
  6. Row 3 / Column 3 → 4 (Hidden Single)
  7. Row 5 / Column 1 → 6 (Hidden Single)
  8. Row 9 / Column 1 → 7 (Hidden Single)
  9. Row 1 / Column 1 → 3 (Naked Single)
  10. Row 1 / Column 3 → 7 (Naked Single)
  11. Row 3 / Column 1 → 5 (Full House)
  12. Row 4 / Column 3 → 3 (Naked Single)
  13. Row 5 / Column 2 → 7 (Full House)
  14. Row 7 / Column 3 → 5 (Naked Single)
  15. Row 8 / Column 3 → 8 (Full House)
  16. Row 4 / Column 8 → 6 (Hidden Single)
  17. Row 2 / Column 8 → 2 (Naked Single)
  18. Row 2 / Column 9 → 6 (Naked Single)
  19. Row 4 / Column 5 → 7 (Hidden Single)
  20. Row 9 / Column 9 → 5 (Hidden Single)
  21. Row 3 / Column 4 → 2 (Hidden Single)
  22. Row 8 / Column 1 → 2 (Hidden Single)
  23. Row 7 / Column 1 → 1 (Full House)
  24. Locked Candidates Type 1 (Pointing): 1 in b6 => r39c7<>1
  25. Row 8 / Column 8 → 1 (Hidden Single)
  26. Row 3 / Column 8 → 9 (Full House)
  27. Naked Triple: 2,3,9 in r7c279 => r7c5<>3, r7c6<>9
  28. Hidden Pair: 3,9 in r59c4 => r9c4<>1
  29. Row 9 / Column 6 → 1 (Hidden Single)
  30. Naked Triple: 4,6,8 in r167c6 => r5c6<>8
  31. Skyscraper: 8 in r1c6,r5c5 (connected by r15c9) => r3c5,r6c6<>8
  32. Row 3 / Column 5 → 1 (Naked Single)
  33. Row 1 / Column 4 → 6 (Naked Single)
  34. Row 1 / Column 6 → 8 (Naked Single)
  35. Row 1 / Column 9 → 1 (Full House)
  36. Uniqueness Test 1: 4/6 in r6c56,r7c56 => r6c5<>4, r6c5<>6
  37. Row 6 / Column 5 → 8 (Naked Single)
  38. Row 5 / Column 5 → 3 (Naked Single)
  39. Row 6 / Column 7 → 1 (Naked Single)
  40. Row 5 / Column 4 → 9 (Naked Single)
  41. Row 8 / Column 5 → 5 (Naked Single)
  42. Row 4 / Column 7 → 2 (Naked Single)
  43. Row 5 / Column 9 → 8 (Full House)
  44. Row 5 / Column 6 → 2 (Full House)
  45. Row 6 / Column 4 → 4 (Naked Single)
  46. Row 6 / Column 6 → 6 (Full House)
  47. Row 9 / Column 4 → 3 (Naked Single)
  48. Row 9 / Column 7 → 9 (Full House)
  49. Row 2 / Column 5 → 4 (Naked Single)
  50. Row 2 / Column 4 → 5 (Full House)
  51. Row 7 / Column 5 → 6 (Full House)
  52. Row 4 / Column 4 → 1 (Full House)
  53. Row 4 / Column 6 → 5 (Full House)
  54. Row 8 / Column 6 → 9 (Naked Single)
  55. Row 7 / Column 6 → 4 (Full House)
  56. Row 8 / Column 2 → 3 (Full House)
  57. Row 7 / Column 2 → 9 (Full House)
  58. Row 3 / Column 9 → 3 (Naked Single)
  59. Row 3 / Column 7 → 8 (Full House)
  60. Row 7 / Column 7 → 3 (Full House)
  61. Row 7 / Column 9 → 2 (Full House)
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