First of all, are you kurogkug ? if not, good ! and secondly never, never ask this question especially the word 'strategy' to BorgQueen ! you got it ?! if you wanna know why ? Read this 'here' and enjoy.
To answer your question, one come to mind is when if you have a dark sq bishop try and get your pawns off the dark sq so your bishop can move around.
Tread. Tread quietly.
The book Best Lessons of a Chess Coach explains this very well!
Basically, one example that comes to mind is that when most of your opponent's pawns are on light sqaures, it usally leave a litter of dark squares unprotected. Therefore, one game plan for you might be to trade off your opponent's dark squared bishop.
Bronstein talks about playing on the dark squares in his comments to the first game of his "Zurich 1953" book (an absolute classic; all 210 games annotated instructively).
Luckily, you can look inside the book at Amazon, and see the entire first game there: http://www.amazon.com/Zurich-International-Chess-Tournament-1953/dp/0486238008/ref=sr_1_1?ie=UTF8&s=books&qid=1256804275&sr=8-1
If I recall correctly, they are properly called color-complexes. There's probably another good term for it.
Monochromy : is a disease. Monochromy utters itself in 2 ways:
1) Melanpenia, meaning insufficient control of the black squares.
2) Leucopenia, meaning insufficient control of the white squares.
This disease may be mechanical or dynamical, i.e. of lasting or of temporary nature. It is easily understood that mechanical monochromy is much more serious than dynamical monochromy.
This is from the book : Modern Benoni by Steffen Zeuthen
I have often wondered if the author was a medical doctor by profession ? 
I've not heard the phrase 'dark square strategy'. With regards to tactics using colours of squares it's something I might try to employ if my opponent has a single bishop, light or dark, I'll try to get as many of my pieces onto the opposite coloured squares as I can. On the one hand it might give my opponent room to move his bishop but if the tactic works he can't actually threaten any piece so effectively gets cut out of the game. I tend to look at tactics like that if I'm a piece down.
anyone please answer this question seriously..
Post 7 seemed good to me.
A lot of people when they see a weak colour complex (e.g. dark squares) want to keep their dark squared bishop to exploit it and avoid its exchange for its opposite number - whereas, as has been mentioned in this thread, the best policy is to exchange off the bishop that defends the weak squares.
I remember many moons ago keeping my dark squared bishop because I wanted to take advantage of the dark squared coloured complex, whereas now of course I'd chop off the opponent's in a heartbeat.
hi. what is the dark square strategy? do u try to play on dark squares? can you explain in details and give games if possible. thanks a lot.