Charlie Brown sucks at checkers, now it's time to demonstrate how bad he is at marbles.
I notice that his persecutors are exclusively female. Shermy, despite his harsh words in the first strip, is the least antagonistic character towards him of the cast. Lucy and Patty dispense game beatdowns, Violet throws him out of her house on a whim, and Snoopy is a mocking presence.
And yet the characters don't seem to notice yet how put-upon CB is, so it doesn't really register to us, yet, as a genuine phenomenon.