Man pages matching name backgammon in section 6:

backgammon.6.en	debian 10 / bsdgames
backgammon.6.ja	debian 10 / manpages-ja
backgammon.6.en	debian 11 / bsdgames
backgammon.6.ja	debian 11 / manpages-ja
backgammon.6.en	debian 12 / bsdgames
backgammon.6.ja	debian 12 / manpages-ja