Solution for Evil Sudoku #4141893275692

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

This Sudoku Puzzle has 71 steps and it is solved using Hidden Single, Locked Pair, Naked Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Full House, Naked Pair techniques.

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Solution Steps:

  1. Row 6 / Column 2 → 5 (Hidden Single)
  2. Row 8 / Column 9 → 5 (Hidden Single)
  3. Row 9 / Column 4 → 4 (Hidden Single)
  4. Row 3 / Column 5 → 4 (Hidden Single)
  5. Row 9 / Column 6 → 1 (Hidden Single)
  6. Locked Pair: 3,6 in r23c6 => r1c46,r3c4,r48c6<>3, r1c46,r3c4,r78c6<>6
  7. Row 1 / Column 6 → 5 (Naked Single)
  8. Row 4 / Column 4 → 5 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 1 in b2 => r56c4<>1
  10. Locked Candidates Type 1 (Pointing): 7 in b3 => r46c7<>7
  11. Locked Candidates Type 1 (Pointing): 4 in b4 => r6c789<>4
  12. Locked Candidates Type 1 (Pointing): 9 in b5 => r78c4<>9
  13. Locked Candidates Type 1 (Pointing): 3 in b8 => r8c12<>3
  14. Locked Candidates Type 2 (Claiming): 1 in r2 => r1c79,r3c79<>1
  15. Locked Candidates Type 2 (Claiming): 9 in r9 => r78c1,r8c2<>9
  16. Locked Pair: 2,8 in r78c1 => r13c1,r7c3<>2, r36c1,r7c3,r8c2<>8
  17. Row 3 / Column 2 → 8 (Hidden Single)
  18. Row 3 / Column 1 → 9 (Hidden Single)
  19. Row 9 / Column 1 → 3 (Naked Single)
  20. Row 9 / Column 2 → 9 (Full House)
  21. Row 6 / Column 1 → 4 (Naked Single)
  22. Row 1 / Column 1 → 1 (Naked Single)
  23. Row 1 / Column 4 → 2 (Naked Single)
  24. Row 3 / Column 4 → 1 (Naked Single)
  25. Locked Candidates Type 1 (Pointing): 3 in b4 => r123c3<>3
  26. Naked Pair: 3,6 in r2c26 => r2c38<>6, r2c8<>3
  27. Locked Candidates Type 1 (Pointing): 3 in b3 => r456c9<>3
  28. Locked Candidates Type 1 (Pointing): 6 in b3 => r56c9<>6
  29. Locked Pair: 1,9 in r56c9 => r56c8,r6c7,r7c9<>1, r6c7,r7c9<>9
  30. Row 7 / Column 9 → 2 (Naked Single)
  31. Row 6 / Column 7 → 8 (Naked Single)
  32. Row 4 / Column 9 → 4 (Naked Single)
  33. Row 7 / Column 1 → 8 (Naked Single)
  34. Row 8 / Column 1 → 2 (Full House)
  35. Row 7 / Column 8 → 1 (Naked Single)
  36. Row 8 / Column 8 → 4 (Naked Single)
  37. Row 8 / Column 7 → 9 (Full House)
  38. Row 6 / Column 3 → 3 (Naked Single)
  39. Row 5 / Column 3 → 8 (Full House)
  40. Row 4 / Column 7 → 2 (Naked Single)
  41. Row 7 / Column 4 → 6 (Naked Single)
  42. Row 2 / Column 8 → 2 (Naked Single)
  43. Row 3 / Column 7 → 7 (Naked Single)
  44. Row 6 / Column 4 → 9 (Naked Single)
  45. Row 7 / Column 3 → 7 (Naked Single)
  46. Row 7 / Column 6 → 9 (Full House)
  47. Row 8 / Column 2 → 6 (Full House)
  48. Row 2 / Column 3 → 4 (Naked Single)
  49. Row 1 / Column 7 → 4 (Naked Single)
  50. Row 2 / Column 7 → 1 (Full House)
  51. Row 5 / Column 4 → 3 (Naked Single)
  52. Row 8 / Column 4 → 8 (Full House)
  53. Row 6 / Column 9 → 1 (Naked Single)
  54. Row 2 / Column 2 → 3 (Naked Single)
  55. Row 1 / Column 2 → 7 (Full House)
  56. Row 2 / Column 6 → 6 (Full House)
  57. Row 3 / Column 6 → 3 (Full House)
  58. Row 1 / Column 3 → 6 (Naked Single)
  59. Row 1 / Column 9 → 3 (Full House)
  60. Row 3 / Column 9 → 6 (Full House)
  61. Row 5 / Column 9 → 9 (Full House)
  62. Row 3 / Column 3 → 2 (Full House)
  63. Row 4 / Column 5 → 7 (Naked Single)
  64. Row 5 / Column 8 → 6 (Naked Single)
  65. Row 5 / Column 5 → 1 (Full House)
  66. Row 8 / Column 6 → 7 (Naked Single)
  67. Row 4 / Column 6 → 8 (Full House)
  68. Row 4 / Column 8 → 3 (Full House)
  69. Row 6 / Column 5 → 6 (Full House)
  70. Row 8 / Column 5 → 3 (Full House)
  71. Row 6 / Column 8 → 7 (Full House)
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