Terminology - Post 1 (surely of many)

One delight of any sport is its terminology. It does not take long for a neophyte watching curling to find him- or her-self thinking there is something strange going on. My personal favourite is the construction that makes one think a proofreader is needed (I colour what the proofreader would suspect to be an error):
"The Ferbey team's first third rock froze to the stone behind the button".

For Pete's sake, is it the first or the third rock? (Answer - it is the fifth, or ninth or tenth, depending on whose rocks you are counting.)