If you want to have a more engaging round like real life battles, try to play chess with a clock. Give 15-20 min to each one without any adding system, or 5min

If you want to have a more engaging round like real life battles, try to play chess with a clock. Give 15-20 min to each one without any adding system, or 5min (or less) if you want to play FPS-ish chess. There are some apps to simulate these clocks. See also adding systems if you want more variety.