"The Duke said he would prefer to play a two-ball with me and urged the other two to tee off first"
A two-ball game of golf involves two pairs, with four players then in all and just two balls used.
Golf clubs and ball
Creative Commons Attribution Share AlikeGolf clubs and ball - Credit: Yuki Shimazu
Each member of each pair takes it turn about to play and alternates on tee shots.
The playing format is more commonly seen in golfing tournaments.