Circle the cat!

The objective of this puzzle game is to prevent the cat from escaping. You and the cat take turns alternately.
During your turn, you can mark a tile unreachable for the cat, which is followed by the cat making a single move to a reachable neighboring tile.
You win if you are able to successfully encircle the cat.
You loose if the cat escapes the hexagonal grid.

Circle the Cat is an adaptation of the classic mathematical puzzle Quadraphage in which
a cat attempts to escape a hexagonal board, but after each turn one square is blocked.
It is based on the flash game http://circlethecat.org/