Round 5 of the IV Open Internacional Xadrez "Cidade de Lagos" is underway in Portugal. The nine-round Swiss tournament runs at 90 minutes plus 30 seconds per move, attracting competitive players hunting rating points. Broadcast on Lichess captures the middlegame battles as leaders jockey for position. With four rounds complete, the field begins separating into contenders and chasing pack. Half the event remains, meaning plenty of chess still to decide the final standings.