Ma'anar ƙamus na " allo na baya" yana nufin filin wasa ko allon wasan da ake amfani da shi don wasan baya. Yawanci, allon bangon baya shine allon rectangular tare da "maki" masu triangular 24 ko "wedges" da aka tsara a cikin layuka biyu na 12 a bangarorin da ke gaba da allon. An ƙididdige maki daga 1 zuwa 24 kuma an raba allon kashi biyu ta hanyar mashaya ta tsakiya da ake kira "bar" ko "mid-point". Ana amfani da allon don wasan yan wasa biyu inda kowane ɗan wasa ke motsa guntun su (checkers) tare da maki bisa ga nadi na dice, tare da babban burin kawar da duk guntuwar su kafin abokin hamayya ya yi.