Well, don't rely on martial sports
(stances, exclusion of weapons and 1vs1 training)
If you seriously consider fighting against 3+ enemies, you should study Krav Maga, Sirsinat or Kuk Sool. Also I have heard good things about Kombatan.
These are efficient martial arts that doesn't care about competitions, traditions or other minor bullshit. These martial arts are about ripping your opponent to shreds. And while training usually starts as 1vs1, eventually you are training with assumption that you will face more than 1 enemy. And stances are used only as a training method- eventually you will be thought to fight from any usual position. Also you are being trained in use of melee weapons.
I personally trained in Sirsinat (it can be described as Kalaripayattu with mentality of Krav Maga) for 3 years, we trained against 1, 2 and 3 opponents (more opponents usually behave like 3). Especially awesome is exercise called "Wolf Pack"- you are thrown in the middle of 3 other opponents. For advanced fighters additional motivation includes being in the middle with no defensive gear on >
At this point I'm pretty sure I can deal with any (reasonable) amount of enemies. If they're unarmed I will inflict light-medium damage to them, if they are armed, then it is severe or lethal damage.
If I need to summarize tips for surviving when facing multiple opponents
1.Head&mouth- try diplomacy
2.Legs- run
3.Pack mentality- identify leader of jerks and target him first (seeing alfa dog crushed might cause fear&panic in other assholes)
4.Weapons- knives, bats, planks, sticks, bricks, rocks, bottles, lighters, chains, belts and anything else that can in any way harm other human being.
5.Legs- move and try to keep other enemies behind the one you are dealing with at this moment
6.Environment- find good location to deal with multiple enemies and move there. For example narrow corridor will create bottleneck and will allow you to deal with one or two at the time. Also smacking someones head or spine against a corner will do some major damage.
7.Fighting "dirty"- it isn't competition. Only way to win is to survive. Target eyes, balls, elbows, knees, neck, diaphragm, temporal bone, hell even hitting nose under the right angle can be lethal. For example kicking knee from outer side will cause it to snap as a dry branch- and it is really hard to keep fighting while hopping on one leg.
8.DO LONG LASTING DAMAGE- you don't want someone you just hit to be back up after few seconds, you want him to stay down.
Hope it helps.
