iOS Do Not Disturb (DND) mode

I'm an Apple user. I use Chess.com on my iPhone, iPad, and sometimes on my iMac (browser). All of my devices talk to each other.

I just blundered a tense game on my iPad, answering the phone when my wife called.

To prevent it happening again, I'm wondering if there's a way I can automatically have my phone go into DND mode when I'm playing a game?

I don't mind being disturbed for any other activity, except gameplay. And it would be great if I sends a message back to my wife that I'm playing chess and I'll call her back....everyone else can go to voicemail.

I'm sure someone else has solved this.

I found this! More testing needs to be done but it looks like I can at least have my devices go into Focus mode when I invoke the Chess.com App

Mine works flawlessly...actually too well. My wife was trying to get in touch but I was on the train doing puzzles and couldn't get her call. I would like it to be confined to ONLY when I'm playing a timed game.