Solution for Evil Sudoku #1436921487543

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

This Sudoku Puzzle has 60 steps and it is solved using Naked Single, Hidden Single, Full House, Locked Candidates Type 1 (Pointing), undefined, Naked Pair, Empty Rectangle techniques.

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Solution Steps:

  1. Row 4 / Column 8 → 1 (Naked Single)
  2. Row 4 / Column 7 → 8 (Naked Single)
  3. Row 2 / Column 5 → 8 (Hidden Single)
  4. Row 4 / Column 2 → 2 (Hidden Single)
  5. Row 6 / Column 5 → 5 (Hidden Single)
  6. Row 2 / Column 2 → 1 (Hidden Single)
  7. Row 6 / Column 3 → 3 (Hidden Single)
  8. Row 6 / Column 4 → 6 (Naked Single)
  9. Row 5 / Column 4 → 1 (Naked Single)
  10. Row 6 / Column 8 → 4 (Naked Single)
  11. Row 6 / Column 2 → 9 (Full House)
  12. Row 7 / Column 4 → 3 (Naked Single)
  13. Row 1 / Column 4 → 2 (Full House)
  14. Row 9 / Column 6 → 2 (Hidden Single)
  15. Row 3 / Column 9 → 1 (Hidden Single)
  16. Row 7 / Column 5 → 1 (Hidden Single)
  17. Row 8 / Column 1 → 2 (Hidden Single)
  18. Row 5 / Column 6 → 9 (Hidden Single)
  19. Row 3 / Column 3 → 2 (Hidden Single)
  20. Row 3 / Column 7 → 4 (Hidden Single)
  21. Row 8 / Column 9 → 8 (Hidden Single)
  22. Row 7 / Column 1 → 8 (Hidden Single)
  23. Row 8 / Column 8 → 3 (Hidden Single)
  24. Locked Candidates Type 1 (Pointing): 9 in b1 => r9c1<>9
  25. X-Wing: 5 c27 r18 => r1c9<>5
  26. X-Wing: 6 c27 r17 => r1c159,r7c9<>6
  27. Row 3 / Column 5 → 6 (Hidden Single)
  28. Naked Pair: 3,7 in r1c59 => r1c1<>3, r1c12<>7
  29. Row 1 / Column 1 → 9 (Naked Single)
  30. Row 3 / Column 8 → 9 (Hidden Single)
  31. Empty Rectangle: 7 in b1 (r29c8) => r9c1<>7
  32. XY-Wing: 4/5/6 in r18c2,r9c1 => r2c1,r7c2<>6
  33. Row 9 / Column 1 → 6 (Hidden Single)
  34. Row 1 / Column 2 → 6 (Hidden Single)
  35. Row 1 / Column 7 → 5 (Naked Single)
  36. Row 8 / Column 7 → 9 (Naked Single)
  37. Row 7 / Column 7 → 6 (Full House)
  38. Row 8 / Column 5 → 4 (Naked Single)
  39. Row 8 / Column 2 → 5 (Full House)
  40. Row 9 / Column 5 → 9 (Full House)
  41. Row 9 / Column 3 → 7 (Naked Single)
  42. Row 2 / Column 3 → 5 (Naked Single)
  43. Row 7 / Column 3 → 9 (Full House)
  44. Row 7 / Column 2 → 4 (Full House)
  45. Row 5 / Column 2 → 7 (Full House)
  46. Row 7 / Column 9 → 7 (Full House)
  47. Row 5 / Column 1 → 4 (Full House)
  48. Row 9 / Column 8 → 5 (Naked Single)
  49. Row 9 / Column 9 → 4 (Full House)
  50. Row 1 / Column 9 → 3 (Naked Single)
  51. Row 1 / Column 5 → 7 (Full House)
  52. Row 3 / Column 6 → 3 (Full House)
  53. Row 4 / Column 5 → 3 (Full House)
  54. Row 3 / Column 1 → 7 (Full House)
  55. Row 4 / Column 6 → 7 (Full House)
  56. Row 2 / Column 1 → 3 (Full House)
  57. Row 5 / Column 8 → 6 (Naked Single)
  58. Row 2 / Column 8 → 7 (Full House)
  59. Row 2 / Column 9 → 6 (Full House)
  60. Row 5 / Column 9 → 5 (Full House)
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