The first diagram demonstrates how a 1300 player handles an advantage against a 1900.
http://chessskill.blogspot.com/2013/04/blunders.html
Of course, he would be more relaxed and play better moves after a blunder by a member of the WORLD TOP FIFTY.
ClavierCavalier,I said "the 1300 could be a sand begger" a sand begger is someone is someone who loses on purpes to get to a lower rating,then to win in low rated turnaments and get the money.So the sand begger might of droped from 2800 to 1300 on purpes to win money,so that I said "maybe the 2700 didn't play in turnaments in 10 years" isn't really importent,It's just like the chance that a 2800 will win a 2700.