I present here an excellent challenge for those wishing to see how good their favorite language is. This is a project that should come in around 2500 words, so not a large program by any stretch of the imagination. Although programming is often quoted in lines, some languages are more vertical than others and that measurement highly distorts the true size of a program. Writers of english such as journalists are very familiar with word counts, and so we are adopting henceforth the word as the basic measurement of a program's size. It translates to under 1000 lines.
The commonly used Hello World type of program tells you almost nothing about a programming language, and is a waste of time. The snake challenge is okay, but it is still a little too simple to show how good a language is. A bad language can deliver a snake program and it doesn't seem bad at all. But this task is of sufficient complexity that the true merits of a language shine through.
You can get the chess challenge specification and sample implementation here.
Here are some screenshots from the reference implementation, which is included in the specification package. I will post the various entrants once they are submitted, so people can compare side-by-side the various language implementations.