Solution for Evil Sudoku #1177713524895

3
7
7
7
3
1
5
4
2
4
3
8
2
7
5
7
1
4
1
8
7
7
7
8
1
7

This Sudoku Puzzle has 70 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Hidden Pair, Locked Pair, Naked Single, Full House techniques.

Naked Single Explanation
Hidden Single Explanation
Hidden Pair Explanation
Locked Candidates Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 6 / Column 2 → 7 (Hidden Single)
  2. Row 9 / Column 5 → 1 (Hidden Single)
  3. Row 2 / Column 8 → 7 (Hidden Single)
  4. Row 9 / Column 7 → 4 (Hidden Single)
  5. Row 3 / Column 8 → 8 (Hidden Single)
  6. Locked Candidates Type 1 (Pointing): 4 in b1 => r1c5<>4
  7. Locked Candidates Type 1 (Pointing): 8 in b2 => r2c1<>8
  8. Locked Candidates Type 1 (Pointing): 1 in b4 => r1c3<>1
  9. Locked Candidates Type 1 (Pointing): 5 in b9 => r5c9<>5
  10. Locked Candidates Type 2 (Claiming): 3 in r9 => r78c8,r8c9<>3
  11. Locked Candidates Type 2 (Claiming): 2 in c8 => r89c9<>2
  12. Hidden Pair: 4,8 in r1c13 => r1c13<>2, r1c13<>6, r1c13<>9
  13. Row 2 / Column 1 → 2 (Hidden Single)
  14. Locked Candidates Type 1 (Pointing): 5 in b1 => r78c2<>5
  15. Locked Candidates Type 1 (Pointing): 6 in b1 => r78c2<>6
  16. Locked Pair: 3,9 in r78c2 => r123c2,r7c13,r89c3,r9c1<>9
  17. Locked Candidates Type 2 (Claiming): 9 in r9 => r78c8,r8c9<>9
  18. Locked Pair: 2,6 in r78c8 => r49c8,r89c9<>6, r9c8<>2
  19. Row 8 / Column 9 → 5 (Naked Single)
  20. Row 9 / Column 3 → 2 (Hidden Single)
  21. Row 7 / Column 4 → 5 (Hidden Single)
  22. Row 9 / Column 1 → 5 (Hidden Single)
  23. Locked Pair: 4,6 in r7c13 => r7c5,r8c3<>4, r7c58,r8c3<>6
  24. Row 7 / Column 8 → 2 (Naked Single)
  25. Row 8 / Column 3 → 6 (Naked Single)
  26. Row 8 / Column 8 → 6 (Naked Single)
  27. Row 7 / Column 1 → 4 (Naked Single)
  28. Row 7 / Column 3 → 4 (Naked Single)
  29. Row 1 / Column 1 → 8 (Naked Single)
  30. Row 1 / Column 3 → 8 (Naked Single)
  31. Row 5 / Column 9 → 8 (Hidden Single)
  32. Locked Candidates Type 2 (Claiming): 9 in c1 => r456c3<>9
  33. Row 5 / Column 3 → 5 (Naked Single)
  34. Row 6 / Column 3 → 1 (Naked Single)
  35. Row 4 / Column 3 → 1 (Naked Single)
  36. Row 4 / Column 7 → 5 (Hidden Single)
  37. Locked Pair: 6,9 in r6c46 => r4c46,r5c5,r6c79<>6, r4c46,r5c5,r6c79<>9
  38. Row 6 / Column 7 → 2 (Naked Single)
  39. Row 6 / Column 9 → 2 (Naked Single)
  40. Row 4 / Column 6 → 4 (Naked Single)
  41. Row 5 / Column 5 → 3 (Naked Single)
  42. Row 4 / Column 4 → 3 (Naked Single)
  43. Row 7 / Column 5 → 9 (Naked Single)
  44. Row 4 / Column 8 → 9 (Naked Single)
  45. Row 2 / Column 5 → 6 (Naked Single)
  46. Row 7 / Column 2 → 3 (Naked Single)
  47. Row 4 / Column 1 → 6 (Naked Single)
  48. Row 5 / Column 1 → 9 (Full House)
  49. Row 5 / Column 7 → 6 (Full House)
  50. Row 9 / Column 8 → 3 (Naked Single)
  51. Row 9 / Column 9 → 9 (Full House)
  52. Row 1 / Column 5 → 2 (Naked Single)
  53. Row 3 / Column 5 → 4 (Full House)
  54. Row 8 / Column 5 → 4 (Full House)
  55. Row 8 / Column 2 → 9 (Naked Single)
  56. Row 1 / Column 9 → 6 (Naked Single)
  57. Row 8 / Column 4 → 8 (Naked Single)
  58. Row 1 / Column 2 → 1 (Naked Single)
  59. Row 3 / Column 9 → 3 (Naked Single)
  60. Row 2 / Column 4 → 9 (Naked Single)
  61. Row 8 / Column 6 → 2 (Naked Single)
  62. Row 1 / Column 7 → 9 (Naked Single)
  63. Row 2 / Column 2 → 5 (Naked Single)
  64. Row 3 / Column 2 → 6 (Full House)
  65. Row 3 / Column 7 → 9 (Naked Single)
  66. Row 2 / Column 7 → 1 (Naked Single)
  67. Row 2 / Column 6 → 8 (Full House)
  68. Row 3 / Column 6 → 5 (Full House)
  69. Row 6 / Column 4 → 6 (Naked Single)
  70. Row 6 / Column 6 → 9 (Full House)
Show More...