why did bobby Fischer quit chess?

What r u even talking about karpov become the world champion 3 years later from the spassky and fischer match he could have been only 32 or 33 years at that time!!! 

He only wanted the money

I think he lost interest because he attained his ultimate goal to be a world champion and found out that it's not enough and choose another path.

He had mental health issues. He suffered from some level of paranoid delusions. Hia mom was a communist that was constantly watched by the FBI, at least during the time when Bobby was growing up and starting to understand the wider world. 

I doubt anybody knows why he became an anti-jesuit. He correctly understood that the chess world was set up in a way that made it easy for the Soviet Union to manipulate the candidates cycle to favor Russian grandmasters to win the world championship.

But as far as dropping off the chess world for 20 years  nobody predicted that, and Fischer left no clue as to why.

Fast fowarding to the 1992 match with Spassky, most agree that the chess was sub par, with both playing with an older style of play and liking it to a couple of old boxers meeting in the ring long after thier prime, just to cash in on the novelty of them boxing one more match.

This is it exactly. Suppose he had beaten Karpov and held the title for another while then what? Karpov would be back again a few years and then a young and hungry Kasparov snappy at his heels - oh HELL no. Fischer left when he remained at the top. 

An underestimated point is that Fischer's demands were not so unreasonable. Why not give Fischer his request that the champion holds the title in the event of a draw? If Fischer came up with something else then so be it, but why not try to get the match going? 

Also when he was younger he had childish visions of "showing them commies" which helped motivate him, then he grew up and found they were just normal people and became friends with many of them.  

At the end of the day chess isn't supposed to be about anything except fun. And if it's not fun anymore, then why do it? Just quit.  

For those saying Bobby's was old forget he was 29 when he defeated Spassky in 1972.  I don't think he was worried about being 32 in 1975.  Also, in 1970-72, his rating for those years is the highest ever achieved over a 3 year period to this day.  In the knockout matches, he defeated two of the world's top players 6-0. Then he was sick when he began playing the previous Word Champ Tigran Petrosian, began 1W, 3D,, 1L, then recovered and won the last four games.

Karpov did NOT have such a record against the same opponents and Bobby surely did not fear playing him.

Bobby had become so egotistical that those of us who remember the 1972 Fischer-Spassky WC Match, remember Americans saying, "Only as big a jerk as Bobby Fischer could get most Americans rooting for the Russian."

Fischer was an even bigger jerk in his unreasonable demands for 1975 and he backed himself into a corner where he wouldn't compromise and got tossed by FIDE.

There are a lot of top chess players who did a lot for Bobby Fischer from his childhood on, but Fischer didn't feel he owed anyone anything.  USCF membership tripled after 1972 and we can only imagine what it would have done for American Chess if Fischer continued to play.  He surely knew that, but turned his back on America anyway.

Of course, there is strong evidence he had mental problems as well, but they don't excuse a lot of his behavior.

He also showed the world what a jerk he was while it was Spassky agreeing to conditions he didn't need to agree to so that the match would continue.  Many of us Americans, during the match, were saying, "Only as big a jerk as Bobby Fischer could get most Americans rooting for the Russian!"

I heard the filthy Jews were stealing his stuff.

Hi Guys!

Can you estimate my photo collage dedicated to the memory of Robert Fischer!

https://youtu.be/WzdL77VpkaY

Because only the great and all wise BF was intelligent enough and forward thinking enough to know that many years after his death, people would need something stupid to write about on something called the chess.com purchased at an AppStore. Chew it! 

Hahahaha  He would have blanked Karpov something like 5-0-15.

He had many reasons to quit chess. Fear of Karpov was probably one of them.

Once you reach the summit, all paths lead downwards.

That's stupid.

He quit chess in the 60s, he almost quit before playing Spassky, and he almost quit during the match with Spassky.

Did he quit for fear of players he was much better than? No, of course not. Mentally speaking he was not well, as evidenced by how he lived his life.

He had some mental illnesses.

Chess amplified them and made them worse.

There's no way of knowing that.

You could just as easily argue that chess gave him something to focus on and helped him keep his life together for the first 30 years... because after he quit he only got worse.

The years take their toll.