[Aliassassin123456]

use DisablePlayerCheckpoint(playerid);
Wiki : https://sampwiki.blast.hk/wiki/DisablePlayerCheckpoint
if it's a Race Checkpoint use DisablePlayerRaceCheckpoint(playerid);
Wiki : https://sampwiki.blast.hk/wiki/DisablePlayerRaceCheckpoint
a little code:

pawn Код:

public OnPlayerLeaveCheckpoint(playerid)
{
      DisablePlayerCheckpoint(playerid);
      return 1;
}
public OnPlayerLeaveRaceCheckpoint(playerid)
{
      DisablePlayerRaceCheckpoint(playerid);
      return 1;
}
public OnPlayerCommandText(playerid, cmdtext[])
{
if(!strcmp(cmdtext,"/killcheckpoint",true))
{
if(IsPlayerInCheckpoint(playerid))
{
DisablePlayerCheckpoint(playerid);
}
if(IsPlayerInRaceCheckpoint(playerid)
{
DisablePlayerRaceCheckpoint(playerid);
}
return 1;
}
return 0;
}