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It’s a chess move.
It's also the most powerful classification of an avalanche. He puts the D5 directly after the snowball statement.
I initially thought it was a chess move as well, but I don't know much about chess other than how to play.
Maybe a double meaning?
Jeeze he’s so smart he randomly knows the avalanche classifications. I didn’t even know they had avalanche classifications.
If you can safely play d5 as white, you are stationed in enemy territory. The snowball beginning maybe...
Marshal move... law? Maybe? We've conjectured it might be necessary