Leela chess finds new move in the nimzo indian.

I did not find this move, I did not even think about whether it was playable.
The position where Leela found this new move was

Black has just played 6.-Bb7
Before I reveal what move leela played try and have a guess.
When you tried (and likely failed) scroll down to find the move Leela made
I thought about some different things in this position when I tried to figure out what the new move was, but it was not even on my radar what Leela played

Yes Leela played 7.e5! Sacrificing a pawn and the exchange. At least that happens if black takes on g2.

A little later on in the game Leela had a strong control around the black king, with a vicious attack.

This was in a game between two engines, but Leela won in a short 23 move game.