[ZzZombo]

Hello there! I need to capture the moment of teams swapping their roles after one ended their way in competive game modes.

[Dr. Greg House]

Try these:

http://wiki.alliedmods.net/Left_4_De...round_halftime
or
http://wiki.alliedmods.net/Left_4_De...round_finished (It might be this one because there's a scavenge_match_finished as well)

Try http://wiki.alliedmods.net/Left_4_De...ents#round_end for versus.

Well I'm afraid this one is all about trial&error for you. Log the events and play a few games to get some results.

[TrueSurvivor]

Depends on what you're doing with this, round_end works just fine as it's called on any round end.
You have 2 round_ends each Versus map.

Basicly you could start with this;

PHP Code:

new iRound;

Public OnPluginStart()
{
    HookEvent("round_start", RoundStart);
}
public OnMapEnd()
{
    //Reset Round Number
    iRound = 0;
}

Public RoundStart(Handle:event, const String:name[], bool:dontBroadcast)
{
    //Add to Round Number
    iRound++;
} 


If you want to do something in a specific round you can just use "if" to check what Round it is.