Making Moves; Computer Moves - Radio Shack 1850 Owner's Manual

Press I LEVEL I until the lighted indicator corresponds to the
level you want or no lights are on to select Handicap Level 0.
Pressing | COLOR | will increment the level by 8 steps as a
short-cut in setting higher levels. The level setting may be
changed at the beginning or at any time during a game. (But
only when it is your turn to move)
3. Making moves
To make a move press down on the piece you wish to move,
then place it on its destination square and press down again.
If you wish, you may select to let the computer make the
opening move. To do this, simply press | PLAY| . The
computer will make its move. Note that when the computer
moves first, it will have the white pieces, so the board should
be set up accordingly. When you move first, the computer will
have the black set and you will have white.
When capturing, key in the capturing pieces move. The
computer will automatically remove the captured piece from
the board memory. When castling, move the King's move first,
then the Rook's.
Note: The computer is programmed to allow en passant
captures where the pawn can capture a piece by moving
diagonally behind it (refer to the rules of Chess for a more
detailed explanation). When it makes an en passant capture,
the computer will remind you to remove the captured piece
by lighting the two lights corresponding to its position (press
the piece down before removing it).
4. Computer moves
The computer will indicate its own moves by sounding a beep
and turning on two lights on the side of the chess board. These
lights indicate the horizontal rank and vertical column of the
piece the computer wishes to move. Press the piece down on
its square. The computer will now show you where the piece
must go. Move the piece to the square indicated and press
down to complete the move.
Note: When a pawn has been advanced to the last rank; it
may be promoted to be any other piece on the board (except
King). First advance the pawn to the last rank, then press the
key (to the right of the playing board) corresponding to the
piece you wish the pawn to become. The computer will not
begin to make its next move until you have selected the
piece. When the computer promotes a pawn, you will have to
confirm its piece type by pressing the piece keys one at a
time until it accepts the key.
5. Illegal moves
If you attempt to make an illegal move the computer will
sound a double beep (high-low) and show you where the piece
you are trying to move came from. You may place the piece
on a legal square or replace it on the original square and move
another piece.
You will also hear an error beep if you do not execute a
computer move correctly or press an improper panel key.