Hi.What do 'they' refer to in:<br/>"With the use of these techniques, players can also attack their opponents if they apply the tactics well."<br/><a href="http://chessprofits.com/defensive-tactics-in-chess.html"><a href='http://chessprofits.com/defensive-tactics-in-chess.html' target='_blank' rel='nofollow'>http://chessprofits.com/defensive-tactics-in-chess.html</a> </a>