First of all the game is all about war, tactics, strategy, key field domination but one essential dimension that you have in real war and that plays a key role towards victory is the mastering of INTELLIGENCE. I have never seen any posts on this topic but for me (as I'm an ex-G2) this is of prime importance. The more you know about your opponent the more chance you have to win, no matter if somewhere at mid-match you have a captain or 2 less than your opponent. ANd this is precisely where the online Stratego differs from the Board Stratego and brings a much more interesting dimension to the game that you don't find in the original Board game. Let's consider some examples:
1) The most obvious way to gain information about your opponent is to scout his unknown pieces and observe the way the other unknown pieces are moving as well as his general behaviour (attack, defend , bluff etc...). This is basic and gives you same kind of information that you would also have in the original Board game. No différences at this stage.
2) Secondly in the online game you can check on the forum (or even on internet in some cases) if some other intelligence is available about your opponent like previous reports on him, posts made by him, screenshots from games he was playing, statement made by other players etc...This is already a source of intelligence that you don't necessarily have when you play face to face a new game with a new opponent.
3) In the online game you can take notes aside or play with some friends in team in order to remember all moves and all discovered pieces of you ropponent. When playing board game it is one against one and no notes allowed. Although taking notes or teamwork maybe a help for new players, when it comes to play against experienced top players it is better to be alone and use only your memory. Normally top players will try to minimize the number of pieces moved on the board as any moved piece is already providing intelligence to your opponent that the piece is not a bomb and not the flag. So top players will usually not have more than 5-6 moved pieces at any stage of the match so it is not so difficult to keep in memory, while if you take notes you have to deconcentrate from the match for a little time which is not in your favor as your opponent will keep concentrate all the time.
4) In the online game you can make friendship with other players and chat/email/phone/skype with them to gather intelligence about other players or tactics. So before starting to play against a new opponent you may already know about his tactics from your friends and arrange your setup accordingly. If you know your opponent is used to lotto you will put some bombs more in front, while if you know your opponent does not take risk of lotto you may keep your bombs in back.
5) In the online game you can play with several accounts which can allow you to hide your real identity (in war this is part of counterintelligence). So this allows you to possibly play against a new opponent and learn (gather intelligence) about him and then when playing second time against him with your other account he may not recognize you and will play with the same setup he played in his first game against you, giving you a big advantage
So this is to say that the online Stratego is much more interesting from this point of view as the dimension INTELLIGENCE is somewhat incorporated like in real war, which is not the case with the original board game or only in a limited way.
Hope there are some other G2 around from whom I would appreciate any comment.