If someone takes squares from your territory, you can challenge them for the neighbourhood.
Where. On the map of your territory, under Profile → Your territory on the map. Next to anyone who took squares from you is Challenge. You choose the neighbourhood it’s about.
How it works. If the other person accepts the challenge, the week begins. Whoever holds the most squares in that neighbourhood after seven days wins 75 points. In a draw, nobody wins.
Privacy zones. Squares in a privacy zone don’t count for anyone.
No reply yet? Then the challenge stays open until they respond. Once it’s over, you can challenge again.
See also Your territory.