Solution for Evil Sudoku #2219834752641

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This Sudoku Puzzle has 73 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 7 / Column 5 → 8 (Naked Single)
  2. Row 2 / Column 5 → 3 (Naked Single)
  3. Row 3 / Column 5 → 5 (Naked Single)
  4. Row 8 / Column 5 → 2 (Full House)
  5. Row 6 / Column 6 → 2 (Hidden Single)
  6. Row 1 / Column 9 → 2 (Hidden Single)
  7. Row 9 / Column 3 → 2 (Hidden Single)
  8. Row 2 / Column 9 → 1 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 1 in b2 => r4c6<>1
  10. Locked Candidates Type 1 (Pointing): 9 in b3 => r49c8<>9
  11. Locked Candidates Type 1 (Pointing): 8 in b7 => r13c2<>8
  12. Locked Candidates Type 2 (Claiming): 6 in c9 => r79c8,r89c7<>6
  13. Naked Triple: 4,5,6 in r4c368 => r4c2<>4, r4c24<>5, r4c27<>6
  14. Hidden Pair: 3,9 in r4c2,r5c1 => r5c1<>4, r5c1<>7
  15. 2-String Kite: 6 in r1c7,r4c3 (connected by r4c8,r6c7) => r1c3<>6
  16. Locked Candidates Type 2 (Claiming): 6 in c3 => r6c2<>6
  17. XY-Wing: 5/7/6 in r7c4,r8c69 => r7c9<>6
  18. Row 7 / Column 9 → 4 (Naked Single)
  19. XY-Chain: 6 6- r3c2 -9- r4c2 -3- r5c1 -9- r5c9 -5- r8c9 -6 => r8c2<>6
  20. AIC: 6 6- r1c7 =6= r6c7 =1= r4c7 =9= r4c2 -9- r3c2 -6 => r1c12,r3c8<>6
  21. Locked Pair: 8,9 in r23c8 => r1c78,r9c8<>8
  22. Continuous Nice Loop: 4/5/6/7 8= r9c2 =4= r6c2 -4- r6c8 =4= r4c8 -4- r4c6 -5- r8c6 =5= r8c9 =6= r9c9 =9= r9c7 =8= r9c2 =4 => r46c3<>4, r5c6,r9c9<>5, r9c2<>6, r9c27<>7
  23. Skyscraper: 5 in r4c6,r5c9 (connected by r8c69) => r4c8,r5c4<>5
  24. X-Wing: 5 c48 r69 => r6c23<>5
  25. Row 1 / Column 2 → 5 (Hidden Single)
  26. Sue de Coq: r6c78 - {14567} (r6c23 - {467}, r4c7,r5c9 - {159}) => r5c7<>9
  27. Row 5 / Column 7 → 7 (Naked Single)
  28. XY-Chain: 8 8- r1c3 -7- r6c3 -6- r4c3 -5- r4c6 -4- r5c6 -8 => r1c6<>8
  29. Row 1 / Column 3 → 8 (Hidden Single)
  30. Finned X-Wing: 7 r18 c16 fr8c2 => r9c1<>7
  31. Hidden Pair: 5,7 in r9c48 => r9c4<>6
  32. Row 7 / Column 4 → 6 (Hidden Single)
  33. Row 3 / Column 2 → 6 (Hidden Single)
  34. Row 4 / Column 2 → 9 (Hidden Single)
  35. Row 4 / Column 7 → 1 (Naked Single)
  36. Row 5 / Column 1 → 3 (Naked Single)
  37. Row 4 / Column 4 → 3 (Naked Single)
  38. Row 6 / Column 7 → 6 (Naked Single)
  39. Row 5 / Column 4 → 8 (Naked Single)
  40. Row 1 / Column 7 → 3 (Naked Single)
  41. Row 4 / Column 8 → 4 (Naked Single)
  42. Row 6 / Column 3 → 7 (Naked Single)
  43. Row 2 / Column 4 → 7 (Naked Single)
  44. Row 5 / Column 6 → 4 (Naked Single)
  45. Row 1 / Column 8 → 6 (Naked Single)
  46. Row 8 / Column 7 → 8 (Naked Single)
  47. Row 9 / Column 7 → 9 (Full House)
  48. Row 4 / Column 6 → 5 (Naked Single)
  49. Row 4 / Column 3 → 6 (Full House)
  50. Row 6 / Column 4 → 1 (Full House)
  51. Row 9 / Column 4 → 5 (Full House)
  52. Row 8 / Column 6 → 7 (Full House)
  53. Row 6 / Column 8 → 5 (Naked Single)
  54. Row 6 / Column 2 → 4 (Full House)
  55. Row 5 / Column 3 → 5 (Full House)
  56. Row 2 / Column 3 → 4 (Full House)
  57. Row 5 / Column 9 → 9 (Full House)
  58. Row 1 / Column 6 → 1 (Naked Single)
  59. Row 1 / Column 1 → 7 (Full House)
  60. Row 3 / Column 6 → 8 (Full House)
  61. Row 9 / Column 9 → 6 (Naked Single)
  62. Row 8 / Column 9 → 5 (Full House)
  63. Row 9 / Column 8 → 7 (Naked Single)
  64. Row 7 / Column 8 → 3 (Full House)
  65. Row 7 / Column 2 → 7 (Full House)
  66. Row 8 / Column 1 → 6 (Naked Single)
  67. Row 8 / Column 2 → 3 (Full House)
  68. Row 9 / Column 2 → 8 (Full House)
  69. Row 9 / Column 1 → 4 (Full House)
  70. Row 2 / Column 1 → 9 (Naked Single)
  71. Row 2 / Column 8 → 8 (Full House)
  72. Row 3 / Column 8 → 9 (Full House)
  73. Row 3 / Column 1 → 1 (Full House)
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