Hi! Thanks for letting us know about that. I believe you are referring to the iOS app. Our iOS team is currently investigating the situation. I'm really sorry for the trouble in meantime!
Error: pop-up app-store during chess games

Same here!
I'm playing the computer on my iPhone and the App Store pop up won't leave me alone!! Like 10 times in a row!!
I close the chess app cause there isn't even a cancel button no more!! Then it pops up again and again! Please fix this guys. It's really annoying !!!!!

Hi! I'm really sorry you're seeing popups during games again :( Can you please grab a screenshot of the ad and send it to support@chess.com ?
Thanks for your help!
Hi,
for some inconcievable reason, in recent time, there is commerical pop-up appearing during games. In particular, when using the mobile version. Surely, a bug, right?
Because, did you really think that there is a chance that I BUY another app when PLAYING CHESS?????????????????????????????????????
If you think so: I am only interested in chess. NO other game, NO other app. I will never ever buy anything suggested when using chess.com.
So, if this "feature" isn't immediately removed, I will stop using chess.com. There are many other alternatives.