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IE : team A is at -10 for the full match, what the fair handicap at the half time -5 ? all the time ? depends ?
Depends on halftime scoring margin. Generally half the full match spread +/- up to about 4 pts. Per your example, Team A is -5 if they lead by 5, -1 when Team A is crushing their opp., and -9 when Team A is getting crushed.