Solution for Evil Sudoku #1221345896740

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

This Sudoku Puzzle has 61 steps and it is solved using Naked Single, Hidden Single, Full House, Locked Candidates Type 1 (Pointing), Naked Triple, Hidden Pair, Skyscraper, Uniqueness Test 1 techniques.

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

Solution Steps:

  1. Row 6 / Column 2 → 9 (Naked Single)
  2. Row 6 / Column 3 → 6 (Naked Single)
  3. Row 2 / Column 7 → 3 (Hidden Single)
  4. Row 2 / Column 2 → 7 (Naked Single)
  5. Row 5 / Column 8 → 8 (Hidden Single)
  6. Row 3 / Column 3 → 8 (Hidden Single)
  7. Row 5 / Column 1 → 4 (Hidden Single)
  8. Row 8 / Column 3 → 2 (Hidden Single)
  9. Row 9 / Column 1 → 3 (Hidden Single)
  10. Row 1 / Column 1 → 5 (Naked Single)
  11. Row 1 / Column 3 → 3 (Naked Single)
  12. Row 3 / Column 1 → 9 (Full House)
  13. Row 4 / Column 3 → 5 (Naked Single)
  14. Row 5 / Column 2 → 3 (Full House)
  15. Row 7 / Column 3 → 9 (Full House)
  16. Row 4 / Column 8 → 4 (Hidden Single)
  17. Row 2 / Column 8 → 6 (Naked Single)
  18. Row 2 / Column 9 → 4 (Naked Single)
  19. Row 4 / Column 5 → 3 (Hidden Single)
  20. Row 9 / Column 9 → 9 (Hidden Single)
  21. Row 3 / Column 4 → 6 (Hidden Single)
  22. Row 8 / Column 1 → 6 (Hidden Single)
  23. Row 7 / Column 1 → 7 (Full House)
  24. Locked Candidates Type 1 (Pointing): 7 in b6 => r39c7<>7
  25. Row 8 / Column 8 → 7 (Hidden Single)
  26. Row 3 / Column 8 → 1 (Full House)
  27. Naked Triple: 1,5,6 in r7c279 => r7c5<>5, r7c6<>1
  28. Hidden Pair: 1,5 in r59c4 => r9c4<>7
  29. Row 9 / Column 6 → 7 (Hidden Single)
  30. Naked Triple: 2,4,8 in r167c6 => r5c6<>2
  31. Skyscraper: 2 in r1c6,r5c5 (connected by r15c9) => r3c5,r6c6<>2
  32. Row 3 / Column 5 → 7 (Naked Single)
  33. Row 1 / Column 4 → 4 (Naked Single)
  34. Row 1 / Column 6 → 2 (Naked Single)
  35. Row 1 / Column 9 → 7 (Full House)
  36. Uniqueness Test 1: 4/8 in r6c56,r7c56 => r6c5<>4, r6c5<>8
  37. Row 6 / Column 5 → 2 (Naked Single)
  38. Row 5 / Column 5 → 5 (Naked Single)
  39. Row 6 / Column 7 → 7 (Naked Single)
  40. Row 5 / Column 4 → 1 (Naked Single)
  41. Row 8 / Column 5 → 9 (Naked Single)
  42. Row 4 / Column 7 → 6 (Naked Single)
  43. Row 5 / Column 9 → 2 (Full House)
  44. Row 5 / Column 6 → 6 (Full House)
  45. Row 6 / Column 4 → 8 (Naked Single)
  46. Row 6 / Column 6 → 4 (Full House)
  47. Row 9 / Column 4 → 5 (Naked Single)
  48. Row 9 / Column 7 → 1 (Full House)
  49. Row 2 / Column 5 → 8 (Naked Single)
  50. Row 2 / Column 4 → 9 (Full House)
  51. Row 7 / Column 5 → 4 (Full House)
  52. Row 4 / Column 4 → 7 (Full House)
  53. Row 4 / Column 6 → 9 (Full House)
  54. Row 8 / Column 6 → 1 (Naked Single)
  55. Row 7 / Column 6 → 8 (Full House)
  56. Row 8 / Column 2 → 5 (Full House)
  57. Row 7 / Column 2 → 1 (Full House)
  58. Row 3 / Column 9 → 5 (Naked Single)
  59. Row 3 / Column 7 → 2 (Full House)
  60. Row 7 / Column 7 → 5 (Full House)
  61. Row 7 / Column 9 → 6 (Full House)
Show More...