Fernando Alonso has finished third in four out of the five races so far this seasonFernando Alonso says he starts this weekend's Monaco Grand Prix "thinking I will try to win".The 41-year-old believes the track's unique demands could give his Aston Martin team a chance to challenge the dominant Red Bulls.Alonso said: "It is a very specific circuit. There is this kind of one-off opportunity which I try to maximise."But the two-time winner in Monte Carlo added he was "not thinking that we are the strongest in Monaco". Alonso also expected Ferrari, who are 24 points behind Aston Martin in…