Solution for Evil Sudoku #1291872654343

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

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 6 / Column 3 → 5 (Naked Single)
  2. Row 6 / Column 2 → 2 (Naked Single)
  3. Row 1 / Column 4 → 7 (Hidden Single)
  4. Row 6 / Column 8 → 7 (Hidden Single)
  5. Row 4 / Column 7 → 9 (Hidden Single)
  6. Row 4 / Column 6 → 1 (Naked Single)
  7. Row 5 / Column 6 → 2 (Naked Single)
  8. Row 3 / Column 6 → 9 (Naked Single)
  9. Row 9 / Column 6 → 7 (Full House)
  10. Row 4 / Column 5 → 3 (Hidden Single)
  11. Row 4 / Column 2 → 6 (Naked Single)
  12. Row 4 / Column 8 → 8 (Full House)
  13. Row 8 / Column 5 → 5 (Hidden Single)
  14. Row 8 / Column 8 → 2 (Hidden Single)
  15. Row 3 / Column 5 → 2 (Hidden Single)
  16. Row 7 / Column 1 → 2 (Hidden Single)
  17. Row 7 / Column 7 → 7 (Hidden Single)
  18. Row 5 / Column 4 → 8 (Hidden Single)
  19. Row 2 / Column 9 → 7 (Hidden Single)
  20. Row 7 / Column 3 → 6 (Hidden Single)
  21. Row 2 / Column 1 → 5 (Hidden Single)
  22. Row 3 / Column 9 → 5 (Hidden Single)
  23. Row 2 / Column 2 → 9 (Hidden Single)
  24. Locked Candidates Type 1 (Pointing): 8 in b9 => r1c9<>8
  25. X-Wing: 1 c38 r39 => r39c1,r9c59<>1
  26. Row 7 / Column 5 → 1 (Hidden Single)
  27. X-Wing: 3 c38 r29 => r9c1<>3
  28. Naked Pair: 4,9 in r9c15 => r9c89<>4, r9c9<>9
  29. Row 9 / Column 9 → 8 (Naked Single)
  30. Row 7 / Column 2 → 8 (Hidden Single)
  31. Empty Rectangle: 4 in b9 (r18c2) => r1c9<>4
  32. XY-Wing: 3/6/1 in r1c9,r29c8 => r3c8,r8c9<>1
  33. Row 3 / Column 3 → 1 (Hidden Single)
  34. Row 9 / Column 3 → 3 (Naked Single)
  35. Row 2 / Column 3 → 8 (Full House)
  36. Row 9 / Column 8 → 1 (Naked Single)
  37. Row 2 / Column 5 → 6 (Naked Single)
  38. Row 1 / Column 5 → 8 (Full House)
  39. Row 2 / Column 8 → 3 (Full House)
  40. Row 1 / Column 7 → 4 (Naked Single)
  41. Row 1 / Column 2 → 3 (Naked Single)
  42. Row 3 / Column 7 → 8 (Naked Single)
  43. Row 8 / Column 7 → 3 (Full House)
  44. Row 3 / Column 8 → 6 (Naked Single)
  45. Row 1 / Column 9 → 1 (Full House)
  46. Row 1 / Column 1 → 6 (Full House)
  47. Row 3 / Column 1 → 4 (Full House)
  48. Row 5 / Column 8 → 4 (Full House)
  49. Row 5 / Column 9 → 6 (Full House)
  50. Row 5 / Column 2 → 1 (Naked Single)
  51. Row 5 / Column 1 → 3 (Full House)
  52. Row 8 / Column 2 → 4 (Full House)
  53. Row 9 / Column 1 → 9 (Naked Single)
  54. Row 8 / Column 1 → 1 (Full House)
  55. Row 8 / Column 9 → 9 (Full House)
  56. Row 9 / Column 5 → 4 (Full House)
  57. Row 7 / Column 9 → 4 (Full House)
  58. Row 6 / Column 5 → 9 (Full House)
  59. Row 7 / Column 4 → 9 (Full House)
  60. Row 6 / Column 4 → 4 (Full House)
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