A row or column with all its tents is grass everywhere else. A row or column with exactly as many open squares left as tents still needed: those squares are all tents.
This is one of the Tents techniques. Each page shows its technique on the same 10×10 from the game, Hard level 3.
The rule
- For each row and column, count its tents and its open squares (not trees, not grass).
- If it has all its tents, mark the open squares as grass.
- If its open squares exactly match the tents it still needs, they’re all tents.
In a real puzzle
On the 10×10, it’s first needed at step 2. Row 3 is numbered 0, so its open squares are all grass.
How often you’ll need it
On every one of the game’s 150 levels, and more than any other technique: 10.2 times per Easy level on average, 14.5 on Medium and 18.4 on Hard. It’s 18 of the 22 moves on the 10×10 here.