DWG-105.3.02
Binary #2 · Hard
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About this puzzle
A 10×10 grid with 23 of its 100 cells given (23%). Every row and column needs 5 rings and 5 dots.
Row 8 has the most givens (4); among the columns, column 10 has the most (4).
One line starts completely empty.
Where to start
The start already shows 7 doubles and 6 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.