Hol's Der Geier has also been published under the names of Raj, Beat The Buzzard, and several others. You can check out the BGG page at: https://www.boardgamegeek.com/boardgame/175/what-heck
The other game they are playing in this chapter, that looks a little like Chess, is Geister aka Ghosts! It's also designed by Alex Randolph, and is another ~15 minute game of tactics and bluff. Check it out at https://www.boardgamegeek.com/boardgame/2290/phantoms-vs-phantoms