Something that has bothered me for a while is why the symbols used for go diagrams are what they are. For me, at least, they are not easy to remember, and I will usually have to check to make sure I used the correct character. I understand that L19x19 may have had no choice in the symbols used and might be unable, unwilling or deem it unwise to change them. However, I still thought I'd give my suggestion on how the symbols should be selected.
First, for a black or white stone just use B or W. Then reserve the next 4 consecutive upper-case letters for marked stones (easy to remember). That would be C, D, E and F for marked black stones and X, Y, Z and A for marked white stones. The order for the markups should be circle, cross, triangle and square which is ordered by the number of strokes needed to draw them (again, easy to remember). Last, reserve S for a square on an empty intersection and T for a triangle on an empty intersection. Unfortunately C and X are already reserved and cannot be used for circle and cross, but, hey, O looks a lot like a circle and P follows O just like cross follows circle, so use O for circle and P for cross (easy to remember, too!).
So, to restate the proposed scheme:
B -
W - 
C -
X - 
O - 
D -
Y - 
P - 
E -
Z - 
T - 
F -
A - 
S - 
Thanks for reading.
