League-of-legends – If the other team is split pushing and your team barely survives a 5v4, what is the best thing to do

Yes, it's worth it to pick another jungler. It does not necessarily have to be a counter-pick though, which probably needs some explanation:

• The advantages you gave for having a jungler hold for your team as well.
• What you labelled as 'more effective' does not really require a jungler at all (coordinate your team to kill the enemy jungler [wards!] or steal a buff)
• Your downsides are too situation dependent:
  1. If behind enemy lines, you better know what you're doing. You have to be sure that your champ can live up to the enemy jungler and you have to make double sure that all other enemies are on their lanes. While it is a downside, it's one for which the risk can be dealt with.
  2. If their jungler is higher level than you, then either you have to improve your jungling, or you got killed/hindered before. Shouldn't happen for the first creep round, unless someone messed up their early game (see below)
  3. same as 1. Do not get killed in the enemy jungle. The enemy jungler shouldn't be able to kill you (or you shouldn't enter his lair!) and if you get ganked it's your fault for losing track of your enemies. If you suspect only a single enemy missing that might come for you, you better be on your way back to your jungle.

Anyways, double jungle teams are quite a common thing, because neither team wants to ignore the advantages gained by having a jungler. However, it also means that your team should know how to deal with that situation. Here's a few tips for general two-junglers-play:

• Prepare for more ganks on both sides. For both junglers it's usually safer to gank, than to visit the other side's forest.
• Make your jungle starting save. Not getting harassed while you get your first buff is extremely important. The team should realize this and protect you. Place your mates into the forest access points near the river to watch out for early ganks. Only let them leave, once the buff is save.
• Of course, you can turn this around too and try to gank the enemy jungler with your team. Not just a single counter-picked champ, but 2+ champs.

As you can see, two junglers are possible, do make sense, and generally lead to very fast and intensive gameplay. Beware on random groups though, as a two-jungler game demands a lot more from all players and failure is easy to achieve in that setting.

Playing other champions really gives you a feel for how to handle situations. It is important to know what your champion is capapable of and what they are capable of. I can offer some tips though.

1. Watch your map: This one is the most important, always watch your map. When more than one person is missing on the enemy team you should be moving to a safe position. Make sure you know where your enemies are or where they were heading last seen. Keep the map scouted and when 3+ people are missing you should be trying to bunch up aswell. If theres 3 or more people missing and you're pushing a lane deep then most likely they are coming to kill you.

2. Know your role: If you're the tank, be the tank. Protect your squishies, stay close to them and protect them. They are usually your carries and thats how you will win the teamfights. Rally your team, don't be afraid to boss them around. "All push mid" "Group up". Late game power is all yours as the tank, you engage, you chose where and when to engage and where to push. Without you your team is pretty useless. If you're the carry, stick to the tank farm within moderation and keep an eye on the map. You're who they're disappearing to come kill. Stick to the brush when teamfights engage so they can't come in and just ice you and run away. Don't reveal yourself till some spells have been cast and they have already begun focusing another less squishy player. If you're support, keep the tank alive and watch your squishys.

3. Don't wander: If its late game and you're all level 18 its time to be a team, move together, stay close. Don't over extend and wandering also involves watching the maps. If the enemy team is pushed into their base and fending off super mionons go steal their camps, but just always farm in moderation and never over extend.

4. Know your enemy: Once again coming back to knowing the champions. If you're the tank and the majority of the enemy team damage dealers are ability power then stack magic resist, if you're a carry and a majority of the enemies are tanky high health grab a madreds and tear them down. Don't trust mobafire 100%. No build is gaurenteed every time. I say this all the time, LoL is dynamic and should be played as such. Build your build around the enemy team and what your team needs from you.

Also a side-note worth mentioning, once you can buy tier 3 runes build some pages for your favorite champions. Try to make ambiguous pages that can apply to for example all AD carries or all tanks. Some good purchase starting points are armor seals, armor pen marks, and magic pen marks. You can use them for basically any character.