Tiger's mouth applications

Push through  

With the tiger's mouth of . Black creates a weakness in White's wall.

Push through  

Vice versa, White creates cutting points in Black's position.

Push through  

For either player, simply connecting is too soft. may even be omitted.

Eyeshape

Joseki example  

In this joseki a tiger's mouth appears, creating better eyeshape. It is a very strong shape. An alternative to is playing at a, which intends to reduce White's base along the side.

However compared with a, has much more eye potential. A single black move at b instantly creates a live shape with two eyes at c and d.

Bulge and anti-bulge

anti-bulge  

prevents White from making a tiger shape. The result can be seen as a weak player's diagonal for White. See also bulge and anti-bulge