Big mistake to earn or lose many points when you have a long time to play

Every time months passed since my last game, I lose about 80% of the games, and after a few games I win about 50% of them.  This alone proves that to earn or lose many points when you have a long time to play is simply wrong.

Not sure what your point is or where you're trying to get.

However, your brain is like a muscle, if you don't use it, it atrophies. So if you're not playing chess for a while your brain is going to have a harder and slower time recognizing chess patterns than it used to when you were playing frequently. Like any other sport (or activity, for that matter), if you don't practice for a long time you get rusty and perform worse. But with a bit of practice you can get back to your old levels, assuming you have the physical/brain condition to do so.

If, after first losing the points, you win about 50%, it means the rating system works. See, after losing the points you will be matched against lower rated players and that is why your win rate goes to 50%. If the rating system did not work your win rate would go to 80% after losing those couple games.

The idea is, that if you have not played for a while, you have probably got a little rusty and thus weaker over time. Or on the other hand you might have played somewhere else or studied a lot and gotten a lot stronger. The system is meant to adjust to these quickly.

"This alone proves that to earn or lose many points when you have a long time to play is simply wrong."

If you play for to many hours your brain will get tired and you will play worse. Your boardvision will go down and you will start to miss threats that you otherwise would see. I have played Blitz for 7 hours straight and I usally end on a much lower rating then what my normal rating is.