This is a fighting move, and if Black plays it White may fight
back by jumping to 2. With a solid white wall off to the right, it is
not inconceivable that Black might end up being captured in a big
way. The fact that he won the encounter in the right half of the board
does not necessarily mean that he will win this one too. This line of
play involves all sorts of tactical risks, and if Black adopts it there is
a very real chance that White will stage an upset. The same goes for
Black B in Dia. 1