Do not update to the latest version!

The latest version of InstantChess app requires you to click on fullscreen ads to use it. Even simply canceling a game would pop-up a video ad with a timer preventing you to close it. The much better alternative Chess.com app is ad supported as well, but theyre not intrusive and much better implemented than InstantChess, without annoying or interrupting your gameplay.

Stirlitz45 about Instant Chess, v5.9.0