Defense: double protection

You already know that protecting is a good way to defend a piece.
Yet, a protected piece might still not be safe.
You might find this hard to believe. So let’s find out how it works.

If one of your pieces is attacked twice, protecting it once is not enough. You need an extra defender. To protect a piece, you must have an equal number of defenders as the other side has attackers. If a piece is attacked twice, it needs double protection.

Have a look at the example. It shows how White keeps Black from capturing a knight, despite two attackers. Well done, White!

What do you have to do?
Defend a piece by protecting it twice.