Oh, and P.S., the doors are deadlocked.
So Rose and Melvin start battling the life-sized pieces for 40 minutes, and the Doctour tries to find a way in. And Rose tries to find a way out.
In the end, Rose finds a chair (much like in The Crimson Horror) and crashes a window. The chess pieces start crying and go back to their board.
Then the Doctour and Rose kiss.