coordinates
Just incase you were having trouble memorizing coordinate equivalents by point name.
Western Point Inversion Chart for 19x19 Goban:
1 = 19 = A = T
2 = 18 = B = S
3 = 17 = C = R
4 = 16 = D = Q
5 = 15 = E = P
6 = 14 = F = O
7 = 13 = G = N
8 = 12 = H = M
9 = 11 = J = L
10 = 10 = K = K
11 = 9 = L = J
12 = 8 = M = H
13 = 7 = N = G
14 = 6 = O = F
15 = 5 = P = E
16 = 4 = Q = D
17 = 3 = R = C
18 = 2 = S = B
19 = 1 = T = A
Note: "I" is not used, historically to avoid confusion with "J"