Thanks for the "insider info" Phillip - I've never used the Calculations function before. You learn something every day! At any rate, it's an excellent effect.
I converted this to B/W by a different means than I usually do. I usually go to Lab Color and delete A&B channels. This time, I went into Image>Calculations. Within the Calculations option, I picked source 2, and selected blue @ 90%, and created a new document from there.
Beautiful winter shot. It really does say "February"! I love the simple colours (it could almost be a black and white photo if not for the tiniest hint of blue). Very effective. :-)