A game of chess between two well-matched opponents: What could be more Sherlockian?

In new images from 'Sherlock Holmes: A Game of Shadows,' our hero detective (Robert Downey, Jr.) and his arch-nemesis Moriarty (Jared Harris) ponder their chess strategies with director Guy Ritchie.

At first glance, we might think Moriarty had an extra hand or two up his sleeve, but those ungloved hands clearly belong to a fourth cast (or crew) member standing behind Harris.

Click for more new images from the film, which opens December 16.