Syntax Error on line 0
D-d4 is not a valid expression, because D-d4 is not a recognized piece, coordinate, command, or subroutine.
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For the sake of debugging, here is the full GAME Code program that this error occurred in. The lines have been properly indented to help you spot scope errors.
   0 D-d4
   1 end
   2 
functions
uservar
Array
(
    [0] => Array
        (
            [main] => Array
                (
                )

        )

)
mline
Array
(
    [0] => MoveLine Object
        (
            [movenum] => 0
            [move] => 
            [level] => 0
            [comment] => 
            [length] => 0
            [newturn] => 
            [turn] => 0
        )

)
allmoves
Array
(
)
movelist
constants
Array
(
)