[JamesH]

Alright follow this :

On the top of your script add

pawn Код:

new CopMarker = -1;

The following lines should be inserted into a TIMER if you want the checkpoint to update every moment use a short timer. LOOK BELOW :

pawn Код:

if(IsPlayerConnected(CopMarker) || CopMarker!= -1)
            {
                if(IsACop(i))
                {
                    new Float:px, Float:py, Float:pz;
                    GetPlayerPos(CopMarker, px, py, pz);
                    SetPlayerCheckpoint(i, px, py, pz, 5.0);
                }
            }

and the command :

pawn Код:

CMD:chase(playerid, params[])
{
if(IsACop(playerid)) 
{
    CopMarker= playerid;
    return 1;
}
}