Combat Chess 60% off, GOG Gem Promo. Ends very soon By w00py | April 18, 2012 0 Comment Combat Chess is on sale for $2.39 (60% off), as a GOG Gem Promo. It’s a one day deal but I posted this really late so it’ll be ending very soon. I remember playing battle chess/star wars chess/archon back in the day. Good times.