Homeworlds: War Games

Question

Here's my second Homeworlds problem! (My first was Homeworlds: Mini Doomsday Machine.)

Lee (0,g3b2) y2g1-
Ray (1,r2) r2-y3y3y3
DS1 (y1) -y1g3
Y (y2) r1-y1
G (g2) r2-g2
R (r3) g1-r1
B (b3) r1-b1

The stash contains r3r3 y2 g3g2g1 b3b3b2b2b1b1.

So... it is down to me, and it is down to you.
  
  If you capture my red ship, you threaten to invade with r1r1.
  
  If you capture my yellow ship, you threaten to invade with y1.
  
  If you capture my green ship, you threaten to build r3r3.
  
  If you capture my blue ship, you threaten to trade r2 for y2.
  
  The battle of wits has begun. It ends when you decide and we both move, and we find out who is right... and who is dead.

Lee to play and mate in 1. (That is, you must find the unique move which Lee can make, such that no matter what Ray replies, Lee will win on the very next turn.)

tehtmi · Accepted Answer

Homeworlds is new to me, so please forgive any misunderstandings or mistakes :)
Proposed solution:

Refutations of some alternatives:

Cuc · Answer

Am I the first with a good idea? Here is my second attempt:

Yes, this is an EXTREMELY difficult problem. But can Lee even win if Ray has an R3 as part of his HW and an R2 (instead of an R1) at R?

Cuc · Answer

I finally see it. It was a real challenge. Wow.

Comment.

Thanks for this one! Great, great, great.

Homeworlds: War Games

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