Quote:
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Originally Posted by UnderseaLcpl
Who knows? I may become a decent player yet!
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"...become a decent player yet,
SIR!" 
I'm your new drill instructor!
Well, we are working on it, aren't we.
after 3.../d7-d5
Colour code:
A
red square means that the piece is under attack and not sufficiently defended, or that it is being attacked by a piece of lesser value. This is usually a pretty serious danger signal and means you must take active measures to avoid losing a piece.
Yellow means that the piece is under attack, but it is just sufficiently defended. You must be careful about removing any defending piece.
Green means the piece has enemy contact but is well defended. Usually it is okay to remove a defending piece.