Ten man rugby

Ten man rugby is an extreme style of play in rugby union in which the side uses the power of its forwards to dominate possession scrums and line-outs, and kicking ability of its fly-half to attain position. The 4 three-quarter backs and the full back are not usually then used in attack, and if they are this is usually restricted to the inside centre on the crash ball, and chasing kicks, especially garryowens. It is very conservative style of play, and not particularly entertaining for the spectator, but can be effective if a team has a strong pack and a good 10, and perhaps less effective backs. The term "ten man rugby" is somewhat derogatory, though most teams will employ these tactics to a degree, especially in foul weather, but usually not exclusively.[1][2][3][4]

Example:

"While Jarrett was enjoying himself in Cardiff, France were uncharacteristically playing ten-man rugby in Dublin to beat Ireland 11–6."[5]

A notable proponent of ten man rugby was Bennie Osler.