it's about personality. some players do play on for a while and it is part of the rules and has nothing to do with tournament invitations. You can play for as l

it's about personality. some players do play on for a while and it is part of the rules and has nothing to do with tournament invitations. You can play for as long as you want within the rules, and every once in a while, people do just that. Others will resign very prematurely and they say so. They say they just didn't "feel" the position. Computer analysis later on says they are equal in position, though.