You'll hear lots of opinions that you should use a closed bridge for certain kinds of shots, usually to "help keep the tip on the cue ball" when using spin (especially follow). Don't believe them. That misconception mostly comes from the fact that the shaft can hop out of your open bridge on hard follow or sidespin shots - that can be distracting, but believe it or not it doesn't really matter to the outcome of the shot. None of that hopping happens during the 1/1000th of a second while the tip is in contact with the cue ball, so it's only your peace of mind and confidence that's affected (if they are affected).
You don't need to "hold the tip on the ball" in order to successfully execute any shot (you also don't need to "press down" with your back hand as some suggest). In fact, you could suspend your cue from strings and let it swing freely into the cue ball and get results just as good, for any kind of shot, as you would using a tight closed bridge.
I use an open bridge for every shot, including masse and breaking, unless a closed bridge will fit better into the space available on the table. I like it because it allows me to see the entire shaft in an unbroken line, which helps me aim most accurately. Snooker players almost universally use an open bridge for that reason, and more and more pool players, including pros, are using them for more and more shots.
However, there's nothing inherently wrong with a closed bridge for any shot, and if an open bridge is uncomfortable for one reason or another, or if you simply prefer a closed bridge for whatever reason or no reason at all, then by all means use a closed bridge for some or all of your shots.
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