Solution for Evil Sudoku #2371528436992

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

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 8 / Column 1 → 6 (Hidden Single)
  2. Row 9 / Column 6 → 7 (Hidden Single)
  3. Row 6 / Column 8 → 6 (Hidden Single)
  4. Row 3 / Column 5 → 7 (Hidden Single)
  5. Row 9 / Column 4 → 1 (Hidden Single)
  6. Locked Pair: 8,9 in r23c4 => r1c46,r3c6,r48c4<>8, r1c46,r3c6,r78c4<>9
  7. Row 1 / Column 4 → 6 (Naked Single)
  8. Row 4 / Column 6 → 6 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 3 in b1 => r46c3<>3
  10. Locked Candidates Type 1 (Pointing): 1 in b2 => r56c6<>1
  11. Locked Candidates Type 1 (Pointing): 2 in b5 => r78c6<>2
  12. Locked Candidates Type 1 (Pointing): 7 in b6 => r6c123<>7
  13. Locked Candidates Type 1 (Pointing): 8 in b8 => r8c89<>8
  14. Locked Candidates Type 2 (Claiming): 1 in r2 => r1c13,r3c13<>1
  15. Locked Candidates Type 2 (Claiming): 2 in r9 => r78c9,r8c8<>2
  16. Locked Pair: 4,5 in r78c9 => r13c9,r7c7<>4, r36c9,r7c7,r8c8<>5
  17. Row 3 / Column 8 → 5 (Hidden Single)
  18. Row 3 / Column 9 → 2 (Hidden Single)
  19. Row 9 / Column 9 → 8 (Naked Single)
  20. Row 9 / Column 8 → 2 (Full House)
  21. Row 6 / Column 9 → 7 (Naked Single)
  22. Row 1 / Column 9 → 1 (Naked Single)
  23. Row 1 / Column 6 → 4 (Naked Single)
  24. Row 3 / Column 6 → 1 (Naked Single)
  25. Locked Candidates Type 1 (Pointing): 8 in b6 => r123c7<>8
  26. Naked Pair: 8,9 in r2c48 => r2c2<>8, r2c27<>9
  27. Locked Candidates Type 1 (Pointing): 8 in b1 => r456c1<>8
  28. Locked Candidates Type 1 (Pointing): 9 in b1 => r56c1<>9
  29. Locked Pair: 1,2 in r56c1 => r56c2,r6c3,r7c1<>1, r6c3,r7c1<>2
  30. Row 7 / Column 1 → 4 (Naked Single)
  31. Row 6 / Column 3 → 5 (Naked Single)
  32. Row 4 / Column 1 → 7 (Naked Single)
  33. Row 7 / Column 2 → 1 (Naked Single)
  34. Row 7 / Column 9 → 5 (Naked Single)
  35. Row 8 / Column 9 → 4 (Full House)
  36. Row 8 / Column 2 → 7 (Naked Single)
  37. Row 8 / Column 3 → 2 (Full House)
  38. Row 6 / Column 7 → 8 (Naked Single)
  39. Row 5 / Column 7 → 5 (Full House)
  40. Row 4 / Column 3 → 4 (Naked Single)
  41. Row 7 / Column 6 → 9 (Naked Single)
  42. Row 2 / Column 2 → 4 (Naked Single)
  43. Row 3 / Column 3 → 3 (Naked Single)
  44. Row 6 / Column 6 → 2 (Naked Single)
  45. Row 7 / Column 7 → 3 (Naked Single)
  46. Row 7 / Column 4 → 2 (Full House)
  47. Row 8 / Column 8 → 9 (Full House)
  48. Row 2 / Column 7 → 7 (Naked Single)
  49. Row 1 / Column 3 → 7 (Naked Single)
  50. Row 2 / Column 3 → 1 (Full House)
  51. Row 5 / Column 6 → 8 (Naked Single)
  52. Row 8 / Column 6 → 5 (Full House)
  53. Row 6 / Column 1 → 1 (Naked Single)
  54. Row 2 / Column 8 → 8 (Naked Single)
  55. Row 1 / Column 8 → 3 (Full House)
  56. Row 2 / Column 4 → 9 (Full House)
  57. Row 3 / Column 4 → 8 (Full House)
  58. Row 1 / Column 7 → 9 (Naked Single)
  59. Row 1 / Column 1 → 8 (Full House)
  60. Row 3 / Column 1 → 9 (Full House)
  61. Row 5 / Column 1 → 2 (Full House)
  62. Row 3 / Column 7 → 4 (Full House)
  63. Row 4 / Column 5 → 3 (Naked Single)
  64. Row 5 / Column 2 → 9 (Naked Single)
  65. Row 5 / Column 5 → 1 (Full House)
  66. Row 8 / Column 4 → 3 (Naked Single)
  67. Row 4 / Column 4 → 5 (Full House)
  68. Row 4 / Column 2 → 8 (Full House)
  69. Row 6 / Column 5 → 9 (Full House)
  70. Row 8 / Column 5 → 8 (Full House)
  71. Row 6 / Column 2 → 3 (Full House)
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