Players can pound coloured squares, depending on their skill level.
Pounding is the action of applying a polearm on a target. The target must be at a distance of exactly two squares from the wielder. At Basic and Unskilled level the target must be in a straight line from the wielder. At Skilled level, it can be a knight's jump from the wielder. At Expert level the target can also be at a diagonal, meaning that any of the sixteen squares at a distance of two can be hit.
Notice that unlike normal combat against an adjacent target, a lance can be used for pounding without any penalty even when the wielder is not mounted.
Pounding is an excellent strategy for hitting both melee and ranged targets; if you have at least Skilled level with speed you can attempt to kill a group of opponents at a choke point (such as a door) a knight's move away. If you plan on pounding in corridors, though, you will need a source of lighting, as you cannot pound a monster you cannot see (even if you can detect it via other means).
In addition, Pounding does not trigger passive attacks, meaning you can use it as an infinitely reusable source of safe attacks against such dangerous creatures, without worrying about running out of projectiles or retaliation.
Most monsters can only use polearm with a skill level equivalent of unskilled. Trolls, however, can use them with a skill level equivalent of skilled, meaning they can hit you from a Knight's jump away.