THE COPA DEL REY is has reached its semi-final stage with four teams fighting for the trophy.
Real Madrid host Barcelona in a huge El Clasico semi-final tonight.
The sides drew 1-1 at the Nou Camp giving Los Blancos a slight advantage going into the second leg.
How many rounds are two-legged matches?
LA LIGA teams join in the competition in the fourth round.
From this round until the final all ties are two legs.
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Do away goals count in the Copa del Rey?
IF the aggregate score is level at the end of the second leg the game will be decided by away goals.
Goals scored away from home will count twice.
If the teams remain equal after the away goals then extra time will be played.
Can the game go to penalties?
IF the teams remain equal after the away goals have been counted then the game will go into extra time.
Extra time lasts for 30 minutes.
If at the end of extra time, the sides cannot be separated then the game will go to penalties.