ChessWar (1991)

(from web site)

ChessWar is a strategic game for two players. It is meant to be played on a standard chessboard with standard chess pieces although it can also be used on any kind of battlefield made of squares. It is NOT chess with dice and some extra rules! Instead, it is strategic game played with chess pieces. So, pieces are not automatically captured, some pieces (units) have ranged attacks and all your pieces (units) may move during your turn.

from the author:
Kalle Marjola 1991, 1994, 1997, 2002

A revised version of original ChessWar board game available at http://rpr.kapsi.fi/games/misc/chesswar.html. Special thanks to Rami Laaksonen (the original playtester), J.C. Klice (most valuable help for the new version), and other playtesters and people at Alter Ego. Not for commercial use, all rights reserved by the author.
When playing, I recommend to print a few extra copies of army lists for easy and helpful reference for the players. The old ChessWar is also available for comprasion.