[Jefff]

You need add array for ids for example
under define

pawn Код:

new RacePlayer[MAX_PLAYERS] = {INVALID_PLAYER_ID, ...};

then in cmd race2

pawn Код:

RacePlayer[target] = playerid;
//dialog here

and if player Y accept

pawn Код:

new target = RacePlayer[playerid];
if(IsPlayerConnected(target) && !g_PlayerInRace[target]) // if player is still connected and is not in race
{
    // your code
}

if not, set

pawn Код:

RacePlayer[playerid] = INVALID_PLAYER_ID;