Merrills is a fun tactical game. It is very old, and has lots of different names, including Mill and the well-known Nine Men's Morris. Due to horizontal and vertical movement of counters on line intersections, Merrills has in common with Go the idea of liberties. It also has in common with Go the primary object of forming a pattern or shape by merely placing or placing and moving pieces on a board. However, its heritage comes from the simpler Tic-Tac-Toe side of the family. Like Fangqi, it is possible to use it as a training game for Go.