[erminpr0]

pawn Код:

new RaceFirstPosition = INVALID_PLAYER_ID;

// When player enters final checkpoint
if(RaceFirstPosition == INVALID_PLAYER_ID)
{
    RaceFirstPosition = playerid;
    SendClientMessage(playerid, color, "RACE | You are the 1st.");
    ...
}

And later you reset, when player gets award or when you start new race.

pawn Код:

RaceFirstPosition = INVALID_PLAYER_ID;