Solution for Evil Sudoku #1484531269741

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

This Sudoku Puzzle has 71 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Hidden Pair, undefined, AIC, Locked Pair, Continuous Nice Loop, Skyscraper, Sue de Coq techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 3 / Column 5 → 5 (Naked Single)
  2. Row 7 / Column 5 → 6 (Naked Single)
  3. Row 8 / Column 5 → 3 (Naked Single)
  4. Row 2 / Column 5 → 9 (Full House)
  5. Row 4 / Column 6 → 9 (Hidden Single)
  6. Row 1 / Column 3 → 9 (Hidden Single)
  7. Row 9 / Column 9 → 9 (Hidden Single)
  8. Row 8 / Column 9 → 8 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 5 in b1 => r79c2<>5
  10. Locked Candidates Type 1 (Pointing): 8 in b8 => r6c6<>8
  11. Locked Candidates Type 1 (Pointing): 4 in b9 => r16c8<>4
  12. Locked Candidates Type 2 (Claiming): 7 in c9 => r1c78,r2c7,r3c8<>7
  13. Naked Triple: 1,6,7 in r6c368 => r6c2<>1, r6c24<>6, r6c27<>7
  14. Hidden Pair: 3,4 in r5c1,r6c2 => r5c1<>1, r5c1<>2
  15. 2-String Kite: 7 in r6c3,r9c7 (connected by r4c7,r6c8) => r9c3<>7
  16. Locked Candidates Type 2 (Claiming): 7 in c3 => r4c2<>7
  17. XY-Wing: 2/6/7 in r2c69,r3c4 => r3c9<>7
  18. Row 3 / Column 9 → 1 (Naked Single)
  19. XY-Chain: 7 7- r2c9 -6- r5c9 -4- r5c1 -3- r6c2 -4- r7c2 -7 => r2c2<>7
  20. AIC: 7 7- r7c2 -4- r6c2 =4= r6c7 =8= r4c7 =7= r9c7 -7 => r7c8,r9c12<>7
  21. Locked Pair: 4,5 in r78c8 => r19c8,r9c7<>5
  22. Continuous Nice Loop: 1/2/6/7 5= r1c2 =1= r4c2 -1- r4c8 =1= r6c8 -1- r6c6 -6- r2c6 =6= r2c9 =7= r1c9 =4= r1c7 =5= r1c2 =1 => r46c3<>1, r1c27<>2, r1c9,r5c6<>6, r1c2<>7
  23. Skyscraper: 6 in r5c9,r6c6 (connected by r2c69) => r5c4,r6c8<>6
  24. X-Wing: 6 c48 r14 => r4c23<>6
  25. Row 9 / Column 2 → 6 (Hidden Single)
  26. Sue de Coq: r4c78 - {12678} (r4c23 - {127}, r5c9,r6c7 - {468}) => r5c7<>4
  27. Row 5 / Column 7 → 2 (Naked Single)
  28. XY-Chain: 7 7- r1c9 -4- r1c7 -5- r2c7 -3- r3c8 -2- r3c4 -7 => r1c4<>7
  29. Row 3 / Column 4 → 7 (Hidden Single)
  30. Row 7 / Column 2 → 7 (Hidden Single)
  31. Row 6 / Column 2 → 4 (Hidden Single)
  32. Row 5 / Column 1 → 3 (Naked Single)
  33. Row 6 / Column 7 → 8 (Naked Single)
  34. Row 5 / Column 4 → 5 (Naked Single)
  35. Row 4 / Column 7 → 7 (Naked Single)
  36. Row 6 / Column 4 → 3 (Naked Single)
  37. Row 5 / Column 6 → 1 (Naked Single)
  38. Row 8 / Column 4 → 2 (Naked Single)
  39. Row 4 / Column 3 → 2 (Naked Single)
  40. Row 6 / Column 8 → 1 (Naked Single)
  41. Row 9 / Column 7 → 3 (Naked Single)
  42. Row 5 / Column 3 → 6 (Naked Single)
  43. Row 5 / Column 9 → 4 (Full House)
  44. Row 4 / Column 8 → 6 (Full House)
  45. Row 6 / Column 6 → 6 (Naked Single)
  46. Row 6 / Column 3 → 7 (Full House)
  47. Row 4 / Column 2 → 1 (Full House)
  48. Row 4 / Column 4 → 8 (Full House)
  49. Row 1 / Column 4 → 6 (Full House)
  50. Row 2 / Column 6 → 2 (Full House)
  51. Row 9 / Column 3 → 5 (Naked Single)
  52. Row 8 / Column 3 → 1 (Full House)
  53. Row 2 / Column 7 → 5 (Naked Single)
  54. Row 1 / Column 7 → 4 (Full House)
  55. Row 9 / Column 8 → 7 (Naked Single)
  56. Row 1 / Column 9 → 7 (Naked Single)
  57. Row 2 / Column 9 → 6 (Full House)
  58. Row 1 / Column 8 → 2 (Naked Single)
  59. Row 3 / Column 8 → 3 (Full House)
  60. Row 3 / Column 2 → 2 (Full House)
  61. Row 1 / Column 2 → 5 (Naked Single)
  62. Row 2 / Column 2 → 3 (Full House)
  63. Row 2 / Column 1 → 7 (Full House)
  64. Row 1 / Column 1 → 1 (Full House)
  65. Row 9 / Column 6 → 8 (Naked Single)
  66. Row 7 / Column 6 → 5 (Full House)
  67. Row 9 / Column 1 → 2 (Full House)
  68. Row 8 / Column 1 → 4 (Naked Single)
  69. Row 7 / Column 1 → 8 (Full House)
  70. Row 7 / Column 8 → 4 (Full House)
  71. Row 8 / Column 8 → 5 (Full House)
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