Enlarge (credit: Charlie Theel) Welcome to Ars Cardboard, our weekend look at tabletop games! Check out our complete board gaming coverage at cardboard.arstechnica.com—and let us know what you think. Rum and Bones: Second Tide is a board game that combines pirates with ideas drawn from Multiplayer Online Battle Arenas (MOBAs). The concept alone is worth a million doubloons; but how well does it work in practice? If you’re not familiar with a MOBA, it’s basically an online multiplayer arena brawl where two teams of players square off.