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There are in squash no rules against switching your racket hand or using two hands at once, as some players do in tennis. So you may use two hands to hit the ball or switch hands.
Robby Temple, one of the professional squash players, does it quite often. Here's a video of Robbie doing it:
There are no rules as to which hand it is racket (just that the ball must be hit by the racket).
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An extra hand on your racket can help your accuracy and the power you can put behind the ball in close situations (where you are limited in your backswing).
It's also misleading in that your opponent will find it harder to read your swing because it's unorthodox.
However, these advantages are marginal and not useful at all if you've learned the orthodox one-handed way from the start, as it takes too long to get your double-handed swing to the same level.
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The downsides on the other hand are very obvious with the extra step you have to take to be closer to the ball on every shot, and the slower reaction time on volleys and retrievals.
And according to squash point being able to move quickly on the court is essential to your game.
Usually players who play double handed are young when they start and find the racket a bit heavy and awkward to hit and learn it that way.
Some other players who do it have often switched from another two-handed game, for example tennis or softball.
So in any case there is nothing against it, but it is not the most impactful swing.
I think eventually players who decide to play squash seriously will eventually retrain in a one-handed swing.
For the social players who just play and run for fun, it is not important to invest the time to unlearn it and you can do what you feel like and feel good about.
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