A = number of letters E in puzzle N.1
B = number of letters F in puzzle N.2
C = number of letters R in puzzle N.3
D = number of letters O in puzzle N.4
E = SUM(number of letters S+2) in puzzle N.5
F = number of letters O in puzzle N.6
G = number of letters L in puzzle N.7
H = SUM(number of letters E+1) in puzzle N.8
After 23.00 be careful! But better don't seek yet.
You can check your answers for this puzzle on Geochecker.com.