DWG-105.4.01
Binary #1 · Expert
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About this puzzle
A 12×12 grid with 33 of its 144 cells given (23%). Every row and column needs 6 rings and 6 dots.
Row 5 has the most givens (4); among the columns, column 1 has the most (5).
One line starts completely empty.
Where to start
The start already shows 10 doubles and 5 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.