The tactics are simple though it's not just the ability but the discipline within the team to carry them out with no regard to personal ambition, from riders who could easily be protected stars with domestiques of their own if they rode for any other outfit.
And it gets simplified even further tactically, when the performance is there. Performance brings confidence into planning and it becomes mathematics. They know they can control the peloton up a HC, cat 1 and cat 2 climb. They know they will control the peloton
without major misshaps or extraordinary surprises. From that point on, it is only a question of where to deliver the deadly blows to other GC contenders.
Yesterday's showdown was classic stage race tactics:
1. Ride the most important bits so hard as a team, that the peloton disintegrates. That is stripping the opposition's weapons both mentally and physically (= tactically).
2. Arrive near the end with remaining GC contenders isolated and one strong domestique still attached. Make him push the pace even further taking the initiative.
3. The other contenders will not have allied so much against you that they could ride against you as a team. They won't be able to negotiate at that point, as they are ultimately contending against each other as well. They don't know each others ambitions or abilities. If one guy decides to "chase the rabbit", your captain gets a free ride up to the line and an opportunity for a stage win.
4. If everybody stalls, no time is lost in GC, the last domestique goes for stage win and improves his position in GC. Almost every eventiality is a positive at that point.
5. In a Grand Tour, all of this needs to happen a couple of times in the most critical stages regarding the GC. On other days it's everybody in a holding pattern: react only if GC is at risk and limit losses at all times.