Rose: Why not. Would be relitevely easy to implement. Specially in a game when the oponent has absoloutley no choice. From a programing perspective all they need to do is add an option to play your oponents move then your move if he does that. May take up a little space especially if you let a chess master program is next 5 moves in with conditions for the oponent doing several moves. I would be happy if they skipped the nice GUI interface and had a text box were you could type in a sequence of coded letters to represent your conditions.

When I am done the project I am working on write now I would even be willing to write the sodo code to do it for chess(minus error checking for wether moves are valid)