[teame06]

Since game_start and game_end doesn't fire off in CS:S. I had to make alternative method to catch when game start and game_ended. So if wanted to know if there was a player on each team. To give bonuses only when for objectives only when there are players on each team.

#include <sourcemod>

#define TEAM_T               2
#define TEAM_CT              3

new CTcount;
new Tcount;

new bool:GameCommenced;

public OnPluginStart()
{
    HookEvent("round_end", _RoundEnd);
    HookEvent("player_team", _PlayerTeam);
}

public _RoundEnd(Handle:event, const String:name[], bool:dontBroadcast)
{
    /* Game Commenced reason */
    if(GetEventInt(event, "reason") == 16)
    {
        GameCommenced = true;
    }
}

public _PlayerTeam(Handle:event, const String:name[], bool:dontBroadcast)
{
    switch(GetEventInt(event, "oldteam"))
    {
        case TEAM_T:
        {
            Tcount--;
        }
        case TEAM_CT:
        {
            CTcount--;
        }
    }

    /* Player disconnected and didn't join a new team */
    if(!GetEventBool(event, "disconnect"))
    {
        switch(GetEventInt(event, "team"))
        {
            case TEAM_T:
            {
                Tcount++;
            }
            case TEAM_CT:
            {
                CTcount++;
            }
        }
    }

    /* If one of the counts goes to 0 that means game is not commenced any more */
    if(!CTcount || !Tcount)
    {
        GameCommenced = false;
    }
}

Now with this all you can use bool:GameCommenced.