Wolf and Sheep

This is a logical game for two players.
In this game human plays with four sheep and Android or human with one wolf.
At the beginning the sheep and the wolf are located on the opposite lines of chess board with size 9x9.
Players move diagonally to the nearest empty cell, the sheep - only forward, the wolf - forward and backward.
To step tap on the sheep and drag to the desired cell.
The wolf's goal is to reach the lower horizontal. The sheep's goal is to block the wolf so that he couldn't move.

P.S. Advert will disappear when you click on it and stay hidden until you run the game next time.