to use one's head

game / video game

tic-tac-toe; noughts and crosses; X's and O's

deck, knock down

(sumo) abisetaoshi, backward force-down; a kimarite in which the attacker forces his opponent over backwards by throwing his weight into him from a grappling position

(colloquial) to make love

(video games) killing one’s opponent with a single blow

hit and run (the military technique of attacking one place and then quickly moving to another before defenders can react)

An underhanded trick. / A lifehack.

(judo) yuko, points or the judge call to the points in judo match. Fewer points to ippon.