It appears that U and T are their subtraction operators, and
that K represents a negative value.

T works in the manner: right-left=mid
U works in the manner: left-right=mid
K is another encapsulating operator to mean a negative.

I think the reason that K, and other things are encapsulating
things is that they may be subsets of a phrase, sort of
like our brackets, except K would mean everything inside
is negative... possibly something like K nice K could
mean bad.

Evidence from message 2:
G QCQ T QBQ T QDQ G             ( 2 T 1 T 3 )   (3-2=1)
G QDQ T KQBQK T QCQ G           ( 3 T -1 T 2 )  (2-3=-1)
G QDQ T QBQ T QEQ G             ( 3 T 1 T 4 )   (4-3=1)
G QEQ T KQBQK T QDQ G           ( 4 T -1 T 3 )  (3-4=-1)
G QEQ U QBQ U QDQ G             ( 4 U 1 U 3 )   (4-3=1)
G QDQ U KQBQK U QEQ G           ( 3 U -1 U 4 )  (3-4=-1)
G QDQ U QBQ U QCQ G             (3-2=1)
G QCQ U KQBQK U QDQ G           (2-3=-1)

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