4 Player chess strategies Are there any nice strategies for 4 player chess? (Bughouse chess)

How to open, how to win? I have not found anything good on the web.
This reddit page has a ton of information, coming from a strong player. 

Excerpts (z means "crazyhouse") : 


  Opening
  The standard rules apply: develop your pieces, control the center, and get your king to safety. But there are some opening ideas uniquely emphasized in z:  
  
  
  Flank pawns should usually be kept where they stand in the opening. Openings like the Bird or Dutch exposing this square are extremely dubious. Even openings like the English and Sicilian aren't to be recommended as they weaken the c2/c7 square respectively. Diagonal pieces can be dropped to exploit the weakened color complex.
  Guard the tender f2/f7 square from sacs so that your king isn't drawn out early.
  Pawn gambits, especially those in which you delay the recapture, are almost without exception a bad idea; your opponent can accept and then simply drop the extra pawn to stabilize.
  Note that getting your king to safety does not always mean castling: sometimes it means keeping it in the center and fortifying the tender points of egress.
  
  
  Middlegame
  The middlegame is almost always where the game is won or lost. This is where you should look to start exchanging pieces, breaking with your pawns, building up pressure on vulnerable squares, or cracking open your opponent's defenses with careful pawn drops or piece sacs. The midgame is rapidly achieved in crazyhouse, so be ready to join battle straight away! 
  
  Strategy Pointers and other midgame motifs  
  
  
  On both offense and defense, be aware of positional sacrifices: knights and bishops or even major pieces can often be sac'd to expose the king in a manner which might be considered unsound in chess but which in z is very powerful. Similarly, a few points of material can be sacrificed to gain a foothold in enemy territory.  
  Scan for weaknesses: holes where pawns can be dropped, pieces vulnerable to a fork, weakly defended kingside squares, overloaded defensive pieces. Identify a weakness and then concentrate all your drops on that weakness.  
  If you identify a weakness but your pocket is empty, look to force exchanges. If your own position is weak, avoid exchanges until you're more solid.
  Defend pawn drops on your kingside: know how to react to p@h3/h6. The knight is an excellent defensive piece in this scenario. [...]
  Knights should be kept on hand until you can drop them to attack weak squares around the enemy's king, place extra pressure on a pin, or drop into a fork.  
  A knight and a queen is the most powerful complementary attacking combination because they each cover squares the other doesn't. Knights can be used to place un-blockable checks, and queens can be used to drop into mates.
  (and a ton more)
  
  
  Common Mating Patterns
  [...]
  
  My Opening Systems
  (see this answer for an excerpt)