does using marijuana before a chess game make you a better or worse player?

No studies have been conducted on this. You can be the first one and find out. Do not forget to correctly use the scientific method.

maybe diakonia will pop in with his meme?lol

My guess is that anything that interferes with concentration would be bad.  On the other hand, when I was in grad school in chemistry at IIT, I remember a fellow grad student who smoked marijuana often, including when he was aligning components of atom-smashing machines.  His lab was in the basement - the fraction of a millimeter swaying of the building above ground could throw off the alignment!  Somehow he got his streams aligned, he didn't blow us up and went on to get his Ph.D.

Following this thread to see if it gets locked. It helps to know what the mods think is ok and what isn't.

I had a buddy who played stoned and beat IM Soulman (name has been slightly modified) over the board in a tourney... my bud was rated around 2100 uscf.

your rating will go down to 420. See what I did there?

have you thought of experimenting on yourself to find the answer first hand ? sorry that question was very unfair in hindsight.

if you study stoned play stoned, Rick Everett rest in peace

It shouldn't matter...as long as you don't inhale...just ask Bill Clinton

On speed you will play faster.

Best time to play some chess... man.

 You would be surely mistaken on that. A lot of studies have been taken on the ergotropic qualities of mary-Jane. Perhaps not specifically on chess but many studies have been done on performance during tests. The general consensus is that memory can be accessed the easiest if it is in the same state of mind as to when the information was absorbed. Another result was that people on weed tend to not care and tend to give up easily. So there is truth in the train stoned play stoned method. But how many stoner will continue their chess study when high. Maybe counting birds is more interesting....

I forgot the question.

I have smoked weed before to play chess, and It's not good for concentration

It makes you a far worse player.  I know this because I've made roughly 99.9% of my moves on this site while baked.  lol

If your asking that question means that your trying to justify your use before playing a game. Which means no matter what answer anyone else gives, your wanting to use it anyway.