Chess player
Chess player is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.
In the early times, chess used to be the prime example of artificial intelligence. Nowadays, some chess programs can beat a human master, and simple implementations can be written in a few pages of code.
Write a program which plays chess against a human player. No need for graphics -- a textual user interface is sufficient.