Android Netrunner Comprehensive Unofficial Rules Wiki

Page 9, Column 2, Paragraphs 7-6

  • Rook can only move to another server if there is another piece of ice in the same "row" as the ice Rook is hosted on, counting up from the innermost piece of ice protecting each server.
  • Rook can be hosted on any piece of ice if it is already hosted on another non-ice card.