[mvpkioye] Two-computer chess

If both players have computers, one can have neat interfaces not possible on the traditional physical board.

A player can analyze by actually moving pieces around before committing a move and sending it.  Create such an interface.  Previously, one had to do it in one's head.

And kriegspiel.

These are almost certainly not new ideas, though still stymied by not being able to connect two computers without a central server.