The 1-1 happened this Tuesday in Valdebebas leaves the tie open for the return in Stamford Bridge, but at the same time history smiles at Chelsea as far as precedents are concerned. Since the maximum continental club competition is played as Champions League (since the 1992/93 season), the 1-1 has been the result in a total of 37 first leg matches, and in 25 of them it was the one that acted as a visitor in the first fight that ended up winning the fight. In other words, in a little more than 2 out of 3 occasions that a double confrontation has been reached after a score like this Tuesday, the one who has acted as a local in the match has qualified for the next round defining.
It should also be noted that the 1-1 to date has only occurred twice in the first leg of the semifinals of Champions: in the 98/99 season, when the Manchester United won 2-3 in Turin, and in 2007/08, when precisely the Chelsea got strong at home to defeat the Liverpool 3-2 and reach a final that weeks later he would lose to him United.
In fact, in total the Chelsea has jumped to Stamford Bridge 4 times in Champions League having finished 1-1 in the first leg, and in 3 of them he achieved qualification. In addition to the aforementioned occasion, when in the second round of 2006/07 they won 2-1 at Porto in the second round and when in 2013/14 he beat 2-0 at Galatasaray in the same round. In the 2014/15 academic year, however, the round of 16 in London ended 2-2 being the PSG and not him Chelsea who passed the eliminatory.
Regarding the Madrid, twice he has contested the return of a crossing of Champions after 1-1 at home in the first leg. In the eighth of the 2012/13 season, he beat 1-2 at United on Manchester and it happened, and in the 98/99 quarterfinals they lost 2-0 in Kiev and it was removed.