NOT watching what your opponent is doing in chess is the cause of most lost games with weak players !

[Chessqueen]

Some weak players have read more than 10 Chess Books on openings, Middlegames, Tactics , strategies and Endgames, but they constantly play attacking moves to their opponents without watching first what their opponents can to the them, and therefore never progress in their rating

Note: Simply by watching what their opponents can do to them in every move weak players can improve their rating and avoid many many blunders; that is the big difference between fast progressing chess players and those that remain with their same rating for years and sometimes 20 years before they start playing both sides instead of just focusing on playing their side of the board

[Spliffjiffer]

i totally agree with that and im one of them in my blitz games, i dont care about my rating but about the satisfaction i get when i make my brillinacies that are sent to hell as soon as i switch on the engines ...its fun !