Flank

From the package:
"The object of FLANK is to capture your opponent's pieces by putting two of your own pieces on directly opposite sides of one of his pieces, or flanking. To do this takes at least two moves, one to attack from one side and one to flank from the other. Watch out that your opponent doesn't Flank you first!"

An abstract strategy game featuring a roll-up board and nine go-stones in two colors; black and white. Packaged in a cardboard tube. Described as "A game of skill for two players, Ages 8 and up."