I turned Copilot back on see what it would do...

I gave it the input

> Let's play chess! I'll go first.

> 1.e4 c5

Here's the first 7 turns of the game it generated https://lichess.org/bzaWuFNg

I think this is a normal Sicilian opening?

At turn 8 it starts not generating full turns anymore.

Update: I tried to play a full game against a Level 1 Stockfish bot vs GitHub Copilot. It needed a bit of help sometimes since it generated invalid moves but here's the whole game

https://lichess.org/6asVFqwv

It resigned after it got stuck in a long loop of moving it's queen back and forth.