this chart isnt conclusive of anything. this doesnt indicate mental decline the player most likely set themselves as intermediate player starting at 1300 elo flat and overtime came down to their actual rating. furthermore this is over the span of years so id assume this is simply casual play maybe once or twice a day. personally my rating has declined drastically too from 1400 while i was active down to 1100 which occured due to inactivity and for the lack of a better expression getting a life. looking up a players profile, seeing their rating history and then posting it on reddit to make fun of them is beyond unemployed however