chance of battle encounter

///Chance of battle encounter
if (global.DEBUG == false)&&(stop == false)
&&(collide_x == false)&&(collide_y == false)
if (keyboard_check(vk_up))
||(keyboard_check(vk_down))
||(keyboard_check(vk_left))
||(keyboard_check(vk_right))
if (image_index == 1)
{
    if (room == room_surfaceview)
    {
        randomize();
        battle_encounter_chance = irandom_range(global.event_encounter_min, 30);
        if (battle_encounter_chance == 30)
        &&(global.event_encounter_min > 0)
        instance_create(x, y, obj_battle_start);
        global.event_encounter_min += 1;
    }
}