![]() ![]() X-Wings and Swordfish: These are more advanced techniques but can be useful in intermediate puzzles.When you eliminate a number as a possibility for a specific cell, remove it from the candidate list for that cell. Candidate Lists: Keep track of the possible numbers for each empty cell in a candidate list (pencil marks).If a number can only go in one row or column within that box, it can be eliminated from the corresponding row or column outside the box. ![]()
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