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170 A PRIMER OF COLLEGE FOOTBALL
other. The half-backs to play this game
must be good, big, strong fellows, other¬
wise they have no business in the line.
There is also a plan of defence most
commonly used when the end man takes
the outside hole, the centre and quarter
the two centre holes, and the half-backs
play a safety game.
(c) Defence to Special Plays.—The de¬
fence to special plays depends upon the
character or underlying principle of the
play itself. The recent changes in the
playing rules abolishing momentum and
mass plays have largely eliminated special
defences. Hitherto when one team knew
that another which it had to meet had a
peculiar pla}T, the former would have the
second eleven use the play against it until
it worked up a special defence to that
particular play.
The rules are constantly changing, but
it might not be altogether useless to state
a few general rules. Mass plays are the