With a little GB experience :) I'd say the following:
- don't listen to Chaqa, or anyone with less then 10% win ratio, about GBs, or do the exact opposite what they say, so probably you'll have a better ratio.
- opening does matter, a lot, but I consider an opening as the first 2-3-4 phases. The very first move is usually the same every time, just like in chess, and players start to differ later. You have to adjust to that, choose your allies/enemies. But be open minded to change your decision any time.
- SchockTrooper is right though, don't make enemies, but you can make allies as well, and you should. Build an alliance with expressing your intentions through orders.
- always consider EVERY possibility, even the wierdest ones. Your actions speak for you, so if you can do multiple things with a unit, with the seemingly same result, then choose carefully. For example Germany supporting Russia into sweden sends a different message than Germany just holding in Denmark. Even though, the outcome is the same, the message for the other players is not!
- and most importantly you have to understand what's happening on the board. Who is with who, what are all the six other players' objectives. Since you cannot get information from anywhere else, just from the board, always check the big map, or the orders, to see what are others' intentions.
- draw button, saved but not readied orders are legitim tools of communication. (I started a game once with a draw order, in 1901 Spring ;) ), to communicate my wish for an alliance)
- play, play, play. And try to play with better players. If you have a feeling you don't understand GB, it may not be your fault, you are probably playing too low level games.
- finally I quote Orwell: "Break any of these rules sooner than doing anything outright barbarous."
PS: http://webdipquiz.blogspot.com