[Retros] A single integer N = a complete chess game

[Juha Saukkola]

> Well, a simple method to do such would be to take 0=="00", 1="01",...> a="10", b="11", ..., A="37", ..., space="63"> Then simply concatenate all the numbers.> So Pa4, Pd5 would be 52100463521305.> It could be improved by using a base 64 encoding instead of base 100,> but length reduction wouldn't be much.

Why not define that there are 6 bits to arriving, and 4 bits says
which of 16 possible pieces go to that square. And then pack it clever.
 
Question is more like a nonsense.
 
One nice thing around these are that, 4 consenquent moves cannot start
from the same square!
 
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