Two players are in the middle of an ongoing one-on-one game of UNO Flip, with all its standard rules in effect.
Play is currently Light Side Up. It is Player B's turn. Player A has 3 cards remaining, and Player B has 2 cards remaining. Below are the players' hands, the top card of the draw pile, and the top two and bottom two cards of the discard pile.
[Light]{Dark}
A's Hand: [Yellow 3, Blue 1, Blue 1]{?, ?, ?}
B's Hand: [Green 9, Blue Flip]{Orange +5, Purple 7}
Draw Pile: {Orange 4, ...(no more than 103 other unknown cards)...}
Discard Pile: [Red Flip, Red 4, ...(103 or fewer other unknown cards)... Yellow 4, Yellow 4]
In order to maximize their chances of winning, how should Player B play out the remainder of this game, and why?
(space for clarifications, hints, and additional info)
The Red Flip is the card that B may play on.
I included the [no-computers] tag because I think it's way more fun without them, but if someone has software that can solve this I'd love to know about it.
Explain your logic, there's work to show. If you got the answer, you'll see why it's really the optimal strategy.