I know I’ll sound stupid, but: what’s shuck-shuck in classic?
Well there are actually a couple different uses of the phrase “shuck-shuck.” I’m more familiar with the Revised version, but its essentially the same principle at work.
Usually a “shuck-shuck” refers to setting up a logistics scheme with transports and ground units, so that you can quickly transfer troops from one end of the board to the other. Basically, its when you leave a sea zone, pick up troops, and then return to that same sea zone to unload, all in a single move. In Revised, if you stick a definite article in front of it, “The shuck-shuck” move, then most assume that you’re talking about the troop train that ends in sz 4 (where you end up unloading 8+ units a round into Archangel or Karelia.)
Other popular shuck spots are sz 12 to E. Canada or UK, and back to Africa in one move. Sz 2 or sz 8, to E. Canada and back to UK in one move etc. All these spots can be used together in conjunction, especially once the USA gets set up. So what you end up with is a long series of “1 move to pick up troops and then return to unload” that leads from the Atlantic coast of America, to London, and then onward either to Northern Russia, or Fortress Europa itself.
Some people will also use the term “shuck”, to describe any situation where infantry stacks are being maneuvered in a coordinated/sequential way. So some will people talk about shucking troops from W. USA, to W. Canada, to E. Canada for example (“the troop train out of Western”) even though no transports would be involved until they actually arrived in E. Canada.
I don’t know who coined the term, but I’ve been using it for about as long as I can remember. :)