Valve give a strategy guide for the upcoming Counter-Strike: Source map de_port ahead of its release in a couple of weeks:
It is a bit daunting to learn a new Counter-Strike map right as it's released, so we've gone through de_port and tried to give people an idea of what our design intentions were. Click here to get to a page that outlines six different strategies to try once the map is available. We're still shooting for release of de_port (along with a redone de_inferno) in a couple of weeks. Next week's Steam news will include some pictures showing off what de_inferno looked like as it was being built from scratch.
Link
Related:
Sketch of de_port layout
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