Hmmm. I'm not really familiar with GURPS mechanics, but I'd have the goblins coming in steady waves, each increasing in difficulty. To be clear, not seperate encounters.
For example: The first wave is, say, 10 goblins. After 4 "rounds", send in 15 goblins. Another 3 rounds, 20 goblins. You get the point. This would at least alleviate some perceived stress on the PCs part. "We have to fight 200 goblins? At once? I surrender!"
Of course, if GURPS opperates completely out of the scheme of "rounds" then totally ignore everything I said
For example: The first wave is, say, 10 goblins. After 4 "rounds", send in 15 goblins. Another 3 rounds, 20 goblins. You get the point. This would at least alleviate some perceived stress on the PCs part. "We have to fight 200 goblins? At once? I surrender!"
Of course, if GURPS opperates completely out of the scheme of "rounds" then totally ignore everything I said