NIGEL Farage has said he'll stand aside for the Tories today in areas where they won last time, giving him a better shot at a majority.
But in Labour and Lib Dem seats, Brexiteers will still have the chance to vote for the Brexit Party if they want to.
What are the main differences between Boris' deal, what Theresa May wanted to do, and what Nigel Farage thinks would be best?
Let's take a look at the key dividing lines which could split the Leave vote in the December poll.
Boris has been proud to say he's been able to ditch the hated Northern Irish backstop, which could have kept Northern Ireland tied to the bloc if there was no deal done.
May's deal would have kept the province in the customs union in the event both sides couldn't agree on a future relationship, which would keep the border open.
Boris, meanwhile, has agreed to put a customs border in the Irish sea, which will mean no need for checks on the island of Ireland.
Nigel Farage, not surprisingly, has said Northern Ireland has been sold out, and are still remaining far too close to EU rules.
But he doesn't have his own version of a deal, and wants to leave without one at all.
Boris claims his new deal will allow Britain to strike new trade deals around the world.
And technically Northern Ireland will remain a part of the UK's territory, so it will benefit too.
Under May's deal, NI may have been left behind from such deals.
Farage, meanwhile, wants to leave with a No Deal Brexit instead of signing up to a divorce deal, but has also thrown his weight behind a Canada-style free trade deal with the EU with looser rules in the future.
Britain is set to stay a part of EU rules until the end of 2020 as part of an inbetween phase.
It was negotiated by Theresa May but Boris Johnson has signed up to it as well.
It means we will leave, but everything will essentially stay the same until the end of the transition period.
Ministers can extend it, but it's likely to only happen with a vote in Parliament.
CONSENT AND EXIT
May's deal could have had no way to pull out, but Boris' has an escape mechanism for Northern Ireland.
Under his plans there will be a vote every four years to decide if they want to stay aligned to the EU rules or not.
Farage, notably, calls this a capitulation, but he has no other actual plan other than to completely leave without a deal, taking Northern Ireland with them and potentially creating problems at the border.
LEVEL PLAYING FIELD RULES
All mention of staying close to EU rules was ditched from Boris' legally binding Withdrawal Agreement.
But it is mentioned in the documents on a future partnership.
This could all be up for grabs as part of intensive trade talks in the future.
Farage wants us to completely go it alone, ditching all EU rules and chucking them out of the window.
But this is unlikely to seal us a trade deal which Boris wants to ensure trade continues to flow, and will likely just irritate our EU neighbours.
Boris has signed up to pay May's agreed £39billion divorce bill – although the amount could change by the time we're finally out.
The money is to tie up loose ends for pots we promised to fund, and to plough into pensions too.
Farage has blasted Boris for this, saying we don't legally owe them a penny and urging him to ditch it all.
As with other areas, defence policy will remain similar throughout the transition period.
But the EU has made clear it will only be a "possibility" in some areas that we would have to work closely together on specific defence missions.
In reality, Britain will remain a key part of international defence pacts like Nato, and is unlikely to want to pull out from these anyway once we leave.
Most of our defence and security partnership is part of the political declaration, which will be discussed as part of a trade deal.
Farage claims Britain can't have an independent defence policy.
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Farage says we won't have control of our fish back after Brexit.
But that's only true for the extent of the transition period, where most things will stay the same.
The can has effectively been kicked down the road to negotiate later.
Boris' political declaration does sign us up to share access to our waters, but there's nothing specific on how that will work yet.
The PM is sure to fight for our right to control as much of it as possible when we're out of the EU and transition period.
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