that 2 bishops vs. 2 knights is a draw

There:

english.turkcebilgi.com/Bishop+(chess)

I found this:

Bishops generally gain in relative strength towards the endgame as more pieces are captured and more open lines are available for them to operate. When the board is empty, a bishop can influence both wings simultaneously, whereas a knight would need a few moves to do so. In an open endgame, a pair of bishops is decidedly superior to either a bishop and a knight, or to two knights. A player possessing a pair of bishops has a strategic weapon in the form of a long-term threat to trade down to an advantageous endgame.

If it's not Googleable, it's bingable.

Still not good enough.