Just at first glance it looks like you simply got to intent in exploiting your advantages and missed it. In a corospondence game, try to exploit the pros and cons of every move on the board.
http://www.chess.com/echess/game?id=75628094
Stalemates
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In general just make sure when you are in the clean-up stage of the game that whenever you make a non-checking move your opponent has a move available to him. It also seems like you don't know how to checkmate with two (or more) heavy pieces:
It's simpler with R+Q:
When you have R+Q vs nothing it's usually a waste of time to get another queen. Just checkmate and get the game over with.
Would someone look at my game that was stalemated recently and explain how.Im not understanding this and its happened twice.Ive tried to read up on it in the one book I have however Im just not understanding or know how to avoid.What move should I have done?Grovy LXVl