I'm unaware of a decrease that will make that big of a hole. You could do an increase, and then decrease an extra decrease on that row. Or, you could work one half, increasing, and then knit the other half, increasing, and graft them together when you're done.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry