[Calgon]

Assuming you want to just use OnPlayerEnterCheckpoint, you could track a variable which determine what checkpoint number they're at, and in the callback you could perform a loop to see who is at or has passed that checkpoint, then add up a number of players who've passed the checkpoint already, and +1 to that number, then that should be their place?

pawn Код:

#include <a_samp>
#include <foreach>

main() { 
}

new
    PlayerRace[MAX_PLAYERS], // so you can have multiple races at once
    PlayerRaceCheckpoint[MAX_PLAYERS];


public OnPlayerEnterCheckpoint(playerid) {
    if(PlayerRace[playerid] > 0) {
        PlayerRaceCheckpoint[playerid]++;
        
        
        new
            iCount;
            
        foreach(Player, i) {
            if(PlayerRaceCheckpoint[i] >= PlayerRaceCheckpoint[playerid])
                iCount++;
        }
        
        // iCount holds the position that they're in.
    }
    return 1;
}

stock initRace(playerid) {
    // do whatever checks you need here.
    PlayerRace[playerid] = 1; // raceid, you might want to fiddle around with this
    PlayerRaceCheckpoint[playerid] = 0;
}