SuperMicro FIDE ZX81 1K is a "from scratch" rewriting for the
Zeddy of the SuperMicro Chess engine "executable" version.
This porting has been strenghtened and optimized so that despite 
the limitation of the hardware platform (cpu and ram) it runs
pretty quickly still being not be so easy to beat for an amateur
chess player.
The engine is provided in various versions: "flexible", where the
player decide each turn of each color if to force a move or let
the computer decide the best one, and more "turnament oriented"
ones where computer will move just white or alternatively black
pieces.
Reaction time should be acceptable and is usually in the order of
few seconds as it would be in a blitz/rapid game.
After loading, to move simply place the cursor with Q/A (up/down)
and V/B (left/right) on the piece to move, grab it with "enter",
then place the cursor to the target square and press enter again
to release. In "flexible" versions if the move is an "empty" one
(meaning start and end square are the same) computer will
calculate the best move (and then place the cursor where it moved
the piece from).
For underpromotion press 5,6, or Y (respectively rook, bishop and
knight) before the last enter.
Even if an automatic check prevent 99% of errors, player is asked
to play just legal moves. Computer will not cheat.
More information at: http://smmax.sf.net.
Happy SuperMicro Chess!
_Stefano Maragò