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

This Sudoku Puzzle has 6 steps and it is solved using Hidden Single, Hidden Pair, Locked Candidates Type 1 (Pointing), Empty Rectangle, Finned Swordfish, Give Up techniques.

Hidden Single Explanation
Hidden Pair Explanation
Locked Candidates Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 7 / Column 9 → 4 (Hidden Single)
  2. Hidden Pair: 1,7 in r45c8 => r45c8<>2, r45c8<>5, r45c8<>6, r45c8<>8, r5c8<>9
  3. Locked Candidates Type 1 (Pointing): 5 in b6 => r2c7<>5
  4. Empty Rectangle: 7 in b8 (r57c2) => r5c4<>7
  5. Finned Swordfish: 7 r268 c134 fr6c6 => r4c4<>7
  6. Give Up: Don't know how to proceed!
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