[steerablesafe]

As I understand it uses the Huffman-code for all moves including the opening moves. Alternatively statistics could be gathered for all first moves, all second moves, etc..., then different Huffmann-code could be applied for opening moves.

I wouldn't be surprised if the statistics for the first few moves were significantly different to the moves deep into the game.

[jameshart]

Probably worth just having short Huffman codes specifically to encode particular opening sequences, before referring to per-move coding