by Jythier
If you want to maintain your score, you need to have 10 points more than your ally.So if your alliance is #1 and you have 10 more points than your ally, you can dissolve the alliance and take the -5 hit, and still be in the lead - and at 11 point differential, your score will actually increase on dissolution.
If you are #1 and your ally is #2, you can dissolve the alliance as long as you have 6 points on your ally, and retain the lead.