I think there's a more efficient (and cleaner) way to do this, but what about...
Code:
for(i=0;i<key_pressed_array.length;i++){
if (key_pressed_array[ i]== "down"){
  if (key_pressed_array[ i+1]== "right"){
    if (key_pressed_array[ i+2]== "strong kick"){
        //execute super move
    }
  }
}
}
I think there's a way of searching an array for a specific combination of elements, but I can recall it at the moment.

hth
japangreg