ip ban not a solution?, since i assume using a open proxy is allready not allowed.
people multi for a fwew reasons.

gain advantidge (selling end)
gain information (looking who is in what fam)
or to screw a fam by filling a spot.

on the first part, giving people more end to play with removes the need of buying end at bor.
But the rest, there is very little u can do against. But u would assume nowdays people have a steady ip? hmm on the other hand loads of people have internet on their phones now day : /

add a game mode where people r allowed to multi? i mean have a fam with 3 peops, each controling 3 empires? of just 1 person controling a fam with x empires.

I've thought about a temp galaxy, like virgo. That would delay the impact of a multi tremendously. Would also be a good tutorial for new players to jump through before getting destroyed in the main galixies.

Outright IP ban is not feasible because of mobile gaming.

Just look at the basic benefits that multying could bring...

Spying - this cannot be fixed theoritcally so leave it..
Sending aid - this can be abused.. through market.. Disable market for first 48 hours of every round... I dont see why we dont do this as is anyways? The problem this also adds though is a multi will also build and perhaps communicate with fam.. to try and grow big before market aiding... that would need a second look into..
Map position - Exploring within a fams core under fam protection for your other account to take back un-noticed...

Cant really think of much more benefits a multi gets.. Look at fixes for that like the 48hr no market bor.. (which also increases strategy)...

-To get rid of existing multy accounts we could say that for exemple all players that have multy accounts won't be blocked if they tell a mod before the 1st of june. After this date no forgive.
-To limit creation of new accounts I think that Virgo was the best.

"Outright IP ban is not feasible because of mobile gaming."

Even without mobile gaming, I can easily and quickly change my IP address and away I go.

I don't think virgo would be the answer (since passing virgo would be easy enough), and then you just have your multi account sitting around doing nothing until you need it. In fact, I really think Virgo won't stop a thing since the benefits of multying is far too high that a simple inconvenience to pass Virgo won't deter.

As for the endo bid, disable the market for 48 hours for BOR, which means a multi will not be able to sell endo and delete. That kills that benefit.

As for landing in your favourite family, I have always advocated a personal score/personality to one's account to counter just that. If your main account becomes something more than just an empire, but moves along with achievements, people with high achievements can participate in special galaxies like SD/ON, etc then it would give them more incentive to play their main account.

As for ruining a families round/spying, no mercy. Ban that guy, find his main account, ban that too. (But I think this form of multying is not so common)

Personalise the market - allow each player create a "Market name" for themselves and each transaction be publicly available to the entire galaxy.  will make people think more when using the market, and prevent any abuse on the market.

Disable the sending of aid for the first 48 hours.   Cut all this starting strat crap out and let people just play the game.

Delete every inactive account as new accounts are easy to spot for multi, just maybe introduce a system where a mod must approved/activate an account before it becomes playable.

Ok I think I am ready to post.

Multi's form for one of three reasons: To show up someone, to help their family, to give them a chance for a fam with real chances..

To make them stop you need to make the advantages of such go away.

But first let's review the potential benefits.

1) Extra operations
Wether hostile (nukes) or passive (plists and visions) the advantage of many accounts is quite obvious.

2) Easy Planets
Also very obvious a farm for planets can assist at all stages of the round, but especially at the begining of a round.

3) Market trading
I once theorized if I could get 7 accounts going, one my real and six my alternates (relax it was for mental stimulation, I never carried it out) I could get them to about 18 planets then save up on each. I would have food, iron, endu, and gc producers with one having octo as well.

The amount of growth I could do with thowse six extra's at BOR was insane.

4) Spare attackers
Being able to attack someone hitting you from multiple accounts is very advantageous. You can remove portals, fig run, ground run, or just do retakes.

5) Forum info
Knowing the plans of a family is a thing that truly is helpful for a multi. This information can help you prepare against a BR, stop a war, farm an unportalled banker or otherwise be a pain.

So now how do we prevent these benefits?

First each fam needs two forums, a public and a 'leaders only' forum. They can limit the extra forum to those they trust and prevent deleters from seeing privledged info to boot.

Next change operations in two ways

1) Intel ops
Make intel ops seperate from hostiles, make them unlimited (removes incentive to cheat) but double the cost.

2) Hostile ops
Hostile ops should be (If no hostile action from target family then (is target under attack?(yes = A warning that the operation will be more difficult, no = no change in difficulty)

Let me demonstrate

Multi has five accounts and is nuking Smaug from them.

Account one had no hostile damages from Smaugs fam in the last 48 ticks
Smaugs agent strength is 100% versus him

Account two no hostile 48 ticks
Smaugs agents 200%

Account three was attacked by Smaug
Smaugs agents 100%

Account 4 no attack
Smaugs agents 300%

Account 5 no attack
Smaugs agents 400%

This increase in defense would stop multi's, stop repetative farms of a fam while it down and end a lot of Illegal Alliance crap.

Next we fix the market with a two hour delay for orders to reach the market. PLAN AHEAD and this kills all market style aid forever.

Rank players according to their personal successes and their family success rank wise. Make a dynamic which includes planet count, NW, family planet count, family NW and make a permament ranking system. This means people will also want to play their main account the best they can and possibly drop multi's since getting caught removes them from ranks.

This leaves much less incentive when all are implemented to multi.

A multi does not need be obvious for a leader... which proves your an idiot Render.

Nor do they need days to check a forum.... which proves your ignorant Render.

Nor does a deleter need forever.... you need to quit being biased against everything I say.

its oki render, everyone just needs to listen to Einstein, and not have a thought of themselves.

Then everything will work out.

I look forward to killing him this round