Rygbi'r undeb: Gwahaniaeth rhwng fersiynau

:Rhif 1 [[Prop pen rhydd]] <!--- (loosehead prop)--->

:Rhif 2 [[Bachwr]] <!--- (hooker)--->

:Rhif 3 [[Prop pen tyn]] <!--- (tighthead prop)--->

:Rhif 4 a 5 [[Clo]] (x 2) <!--- (locks)--->

:Rhif 6 a 7 [[Blaenasgellwr]] (x 2) <!--- (flanker)--->

:Rhif 8 [[Wythwr]]

:Rhif 9 [[Mewnwr]] <!--- (scrum-half)--->

:Rhif 10 [[Maswr]] <!--- (fly-half)--->

:Rhif 12 a 13 [[Canolwr]] (x 2) <!--- (center)--->

:Rhif 11 a 14 [[Asgellwr]] (x 2) <!--- (wings) --->

:Rhif 15 [[Cefnwr]] <!--- (full back)--->