Black is ahead in running down. White can consider getting ahead with keima.
In the resulting position, Black can get ahead with keima too.
Black's keima can be cut though (unlike white's), no? ~srn347
Bob McGuigan: Not usefully at this point.
Usually, one will play keima from a strengthened postion. If one jumps from a weaker position, the cut can become dangerous.
The keima should be compared to what happens if White plays the straight-forward nobi at . Black can play double hane, and stays ahead. White's position is pushed far more to the right.
Therefore the keima is an alternative to consider, rather than get the pushing the cart from behind position in a pushing battle.