Dec at each end every other RS row 10 times.
It looks like you decrease on every 4th row, since it says every other right-side row. If you decrease every other row--every right-side row--your decreases will happen too fast.
"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