Old Colossus chess game
Thanks to http://www.jac64.com for Commodore 64 java emulator.
Use keyboard only: click on java, press enter & use arrow keys

 
Reset, Sound off, Sound on, Fullscreen

Other keyboard options:
-type e 2, press enter, e 4, enter again (backspace works also) - to move pieces
-hold shift and press N - to start a new game
-hold shift and press U - undo move
-hold shift and press G - Go! (and switch sides)
-hold shift and press P - autoplaying mode
-hold shift and press R, then press Enter - replay game
-hold shift and press V, then press down arrow, then Enter - to set sound off

Source http://www.spacious-mind.com/html/commodore_c64tpc.html
Links to other emulations: Cesar, Chess 7.5, Colossus 4, Cyrus II, Hypra chess, Master chess, Mychess, Petchess, Sargon 2, Schach 64, Superchess.
Some fun:
Display memory of COLOSSUS CHESS