How do I...Make something a 1 in 2 chance of happening

Hello, i want to create something which has a 1 in 2 chance of damaging the player. Please help!

please say if i am too vague

one way to compare choose( 1, 2) with 1

This could be a high level math question of what really is a 1 in 2 chance, but try: If choose(0,1)=1 - do your thing.

You can also convert a chance into a percent, so 1 in 2 is 1x100% / 2 = 50%, so you could do during attack code set variable to int(random(0,100)) then do a compare 2 values event and variable less or equal to 50 damage is done.

If it was a 1 in 5 chance, 1X100% / 5 = 20% so int(random(0,100)), if variable less or equal to 20 then damages done.