In Stratego, players identify hidden ranks by doing what with pieces?

Attacking and comparing ranks

Which science-fiction movie follows a linguist trying to communicate with alien visitors on Earth? How many black squares are there on a chessboard? Which Marvel hero is a vampire hunter and appears alongside supernatural forces frequently? In 'A Christmas Story', what does the father win as a prize, proudly displayed in the window? What invincible star-shaped item grants Mario temporary power-up and invulnerability?