Pikeman is a unit able to move back and attack forward along with diagonal. If a unit tries to kill it from the front in a L-fashion, it will die along with Pikeman.
Strengths: Pikeman has good control in its row and near it since it is able to move backwards. At higher tiers it is able to attack further forward and diagonally, making Pikeman good at defense. Furthermore, it soft counters powerful units such as dragon, soul keeper, and knight.
Weaknesses: Pikeman has a very hard time moving to another column-- the only way is to take a unit with its diagonal attack. In addition, its cost is quite a bit, so if there is a deadlock in its column, it is stuck there with difficulty in trading. With no units to attack, it is also limited to one square forward at a time, so moving backwards multiple squares would be a tempo loss.