Triumvirate Chess

If you had a Java-capable browser, you could play Triumvirate Chess here.
Keys "s"=save "l"=load "b"=back once

Pawns (centurions) can capture knights (caesars) on their forward move, including the initial two-step move. When the first two caesars are gone, the last becomes the royal king. No en passant. No promoting to caesar. Paul DeWitte, 2004.

Triumvirate Chess

Chess Variants

These are simple illustrations rather than strong opponents.