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

This Sudoku Puzzle has 41 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Triple, Naked Pair, Locked Candidates Type 2 (Claiming), Empty Rectangle, Naked Single, Uniqueness Test 4, undefined, Discontinuous Nice Loop, Hidden Triple, Uniqueness Test 1, Jellyfish, Turbot Fish, Give Up techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 1 / Column 4 → 8 (Hidden Single)
  2. Row 1 / Column 5 → 6 (Hidden Single)
  3. Row 3 / Column 8 → 6 (Hidden Single)
  4. Row 7 / Column 9 → 7 (Hidden Single)
  5. Locked Candidates Type 1 (Pointing): 4 in b1 => r2c7<>4
  6. Locked Candidates Type 1 (Pointing): 3 in b2 => r2c7<>3
  7. Locked Candidates Type 1 (Pointing): 2 in b3 => r47c7<>2
  8. Locked Candidates Type 1 (Pointing): 8 in b6 => r6c3<>8
  9. Naked Triple: 1,4,5 in r5c245 => r5c139<>1, r5c9<>4
  10. Locked Candidates Type 1 (Pointing): 4 in b6 => r4c4<>4
  11. Naked Pair: 2,8 in r58c1 => r4c1<>2
  12. Naked Triple: 2,4,8 in r8c139 => r8c46<>2, r8c4<>4, r8c6<>8
  13. Locked Candidates Type 2 (Claiming): 8 in r8 => r9c3<>8
  14. Empty Rectangle: 1 in b3 (r14c1) => r4c7<>1
  15. Row 4 / Column 7 → 4 (Naked Single)
  16. Uniqueness Test 4: 2/8 in r5c13,r8c13 => r58c3<>2
  17. X-Wing: 2 r58 c19 => r4c9<>2
  18. XY-Chain: 5 5- r4c8 -2- r5c9 -3- r5c3 -8- r8c3 -4- r7c2 -1- r5c2 -5 => r4c2<>5
  19. Discontinuous Nice Loop: 1 r4c3 -1- r2c3 -4- r8c3 -8- r8c1 -2- r5c1 =2= r4c3 => r4c3<>1
  20. XY-Chain: 2 2- r4c3 -6- r4c9 -1- r4c1 -9- r1c1 -1- r2c3 -4- r8c3 -8- r5c3 -3- r5c9 -2 => r4c8,r5c1<>2
  21. Row 4 / Column 8 → 5 (Naked Single)
  22. Row 5 / Column 1 → 8 (Naked Single)
  23. Row 5 / Column 3 → 3 (Naked Single)
  24. Row 8 / Column 1 → 2 (Naked Single)
  25. Row 5 / Column 9 → 2 (Naked Single)
  26. Row 8 / Column 9 → 4 (Naked Single)
  27. Row 8 / Column 3 → 8 (Naked Single)
  28. Row 4 / Column 3 → 2 (Hidden Single)
  29. Row 1 / Column 8 → 4 (Hidden Single)
  30. Hidden Triple: 5,7,9 in r6c246 => r6c246<>1, r6c2<>6
  31. Naked Pair: 5,9 in r68c6 => r2c6<>5
  32. Naked Pair: 1,2 in r2c6,r3c4 => r2c45<>1, r2c4<>2
  33. Uniqueness Test 1: 5/9 in r6c46,r8c46 => r6c4<>5, r6c4<>9
  34. Row 6 / Column 4 → 7 (Naked Single)
  35. Row 4 / Column 2 → 7 (Hidden Single)
  36. Row 4 / Column 9 → 6 (Hidden Single)
  37. Row 9 / Column 2 → 6 (Hidden Single)
  38. Row 6 / Column 3 → 6 (Hidden Single)
  39. Jellyfish: 1 r1346 c1479 => r2c7,r59c4<>1
  40. Turbot Fish: 1 r5c5 =1= r5c2 -1- r7c2 =1= r9c3 => r9c5<>1
  41. Give Up: Don't know how to proceed!
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