DWG-105.4.03
Binary #3 · Expert
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About this puzzle
A 12×12 grid with 34 of its 144 cells given (24%). Every row and column needs 6 rings and 6 dots.
Row 3 has the most givens (4); among the columns, column 6 has the most (4).
Where to start
The start already shows 7 doubles and 7 sandwiches, each of which forces its neighbours.
At least once you will need the stronger step: list the ways an almost full line can be finished and keep the only one that works — remembering that no two lines may be identical.