In tournament games, a more complicated method is used to prevent players from gaining information about foreign hands.

It is difficult to prevent people from gaining this benefit.

Blockers rushed in to prevent the man from gaining any more ground.

The same characteristic, to be sure, prevented it from at once gaining ground in the national life.

German troops prevented them from returning or gaining access to water.

Similarly number 3 can prevent number 4 from gaining access to either i or 2.

Abject poverty prevented the boy from gaining access to top quality medical care.

Now we just want to prevent the team from gaining a yard.

Their legs, however, prevent them from gaining much height in making a jump.

This did not prevent Solidarity from gaining more support and power.