Many people have said that Myth plays similarly to chess and that the engine would faithfully allow such a conversion. The Idiot Collective have posted two images of their chess conversion to the Myth II engine. Here are some of the features you can expect:

Pawnsswapping!
Scripted Turntaking! (On Legendary)
Tons of new sounds & units!
Retextured Models!
Easter Eggs!

& much much more... :-)

The first post shows the map with normal Myth units, but the second post shows new chess units. When can you expect MythCHESS? Soon... (mb)