Square holds up pretty good. It's about time for another chain race for the year.
sounds interesting, i don't sharpen race chain. i'd be clueless there. my chains are oriented toward the arborist, nothing exotic but able to hang in from one sunday night maintenance session to the next. i like the timberline because at the end of a work day i can sharpen my undamaged chain in a few minutes while i sip a cool one. and done properly, they come out v. sharp.