[Nero_3D]

There was a good example in the old area51.pwn which came with the sa-mp package :/

Its quite easy, you create an player array

pawn Код:

stock gPlayerCheckpointStatus[MAX_PLAYERS];

and you define some checkpoints

pawn Код:

enum {
    CHECKPOINT_NONE,
    CHECKPOINT_ONE,
    CHECKPOINT_TWO
}

and than if you set a checkpoint you just set the array to

pawn Код:

gPlayerCheckpointStatus[playerid] = CHECKPOINT_ONE;

SetPlayerCheckpoint(playerid, ...);

in the end if you disable the checkpoint you need to reset the array

pawn Код:

gPlayerCheckpointStatus[playerid] = CHECKPOINT_NONE;

DisPlayerPlayerCheckpoint(playerid);

And in OnPlayerEnterCheckpoint

pawn Код:

switch(gPlayerCheckpointStatus[playerid]) {

    case CHECKPOINT_ONE: {}

    case CHECKPOINT_TWO: {}

    default: {
        gPlayerCheckpointStatus[playerid] = CHECKPOINT_NONE;
        DisPlayerPlayerCheckpoint(playerid);
    }

}

The timer for the explosion should be clear, if not read the wiki page about SetTimerEx