system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Could a lightsaber, if braced, positioned, and powered sufficiently, deflect a shot from the Death Star?

Some considerations:

- How much force from the blast is transferred kinetically to whatever is holding the lightsaber? 
- Would a larger diameter blade be necessary? 
- Does the power going into the blade have to be proportional to the energy it is diverting?
gpt
No.  The blade of a lightsaber can be 'broken', as in the energy of another blade or weapon blast being so powerful as to pass through the defending blade.  This is seen with Sith lightsabers, which possess artificial red crystals which make them slightly more powerful than a natural green or blue crystal.