[drakunovu6]

Here it is:

PHP Code:

#include <amxmodx>
#include <amxmisc>
#include <cstrike>
#include <hamsandwich>

new cvar_countdown, g_countdown, g_countdown_hud;

enum (+= 100)
{
    TASK_COUNTDOWN
}

public plugin_init()
{
    register_plugin("Countdown when 1v1", "1.0", "Drakunovu");
    register_event("HLTV", "event_new_round", "a", "1=0", "2=0")
    RegisterHam(Ham_Killed, "player", "fw_PlayerKilled");
    
    cvar_countdown = register_cvar("countdown_time", "30");
    
    g_countdown_hud = CreateHudSyncObj();
}

public event_new_round()
    remove_task(TASK_COUNTDOWN);

public fw_PlayerKilled(victim, attacker, shouldgib)
{
    new num;
    static players[32];
    get_players(players, num, "ah");

    switch(num)
    {
        case 1: remove_task(TASK_COUNTDOWN);
        case 2:
        {
            if (cs_get_user_team(players[0]) == cs_get_user_team(players[1])) return HAM_IGNORED;

            g_countdown = get_pcvar_num(cvar_countdown);
            set_task(1.0, "countdown", TASK_COUNTDOWN, _, _, "b");
        }
    }

    return HAM_IGNORED;
}

public countdown()
{
    set_hudmessage(0, 255, 0, -1.0, 0.28, 2, 0.02, 1.0, 0.01, 0.1, 10);
    ShowSyncHudMsg(0, g_countdown_hud, "Kill each other in %d or slay!", g_countdown);

    new number[20];
    num_to_word(g_countdown, number, charsmax(number));
    client_cmd(0, "spk ^"fvox/%s^"", number); // you can change the sound right here.

    g_countdown--;

    if (g_countdown < 0)
    {
        remove_task(TASK_COUNTDOWN);

        new num;
        static players[32];
        get_players(players, num, "ah");

        if (num == 2)
        {
            user_kill(players[0]);
            user_kill(players[1]);
        }

        return;
    }
}