In European Pocket Billiard Federation (EPBF) nine-ball , the break box is a zone in the "kitchen" of the head (British: bottom ) of the table, from which the break shot must be taken with the cue ball , not unlike the "D" zone used in snooker , English billiards and blackball . The break box consists of the middle 50% of the kitchen area, delimited laterally by the head rail (British: bottom rail ) and head string (not the baulk line ), and longitudinally by two parallel lines drawn (on the cloth , or more often imaginarily) from the head rail diamonds that are closest to the head corner pockets, out to the head string (see illustration to the right ). This departure from WPA World Standardised Rules defeats the common break -from-the- side - rail technique for pocketing the 9 ball on the break to win the game instantly; while 9 ball breaks are still possible, they are much more difficult under the new rule. This EPBF Euro-Tour requirement was added to the Europe vs. US all-star team event, the Mosconi Cup , in 2008 but has not otherwise been seen much by non-Europeans as of 2011.