14. TRACE FORWARD (Retrieving stored moves)
As explained in the previous section, you can use the RESTORE function to return a
saved game to its original position or use the TRACE BACK key to take moves back.
The TRACE FORWARD function is provided so that moves that have been taken
back can be called up again forwards without the computer recalculating the moves
that have already been calculated. When all calculated moves are displayed and there
are no more in the computer's memory, [ EN D ] appears on the LCD. From this or
any other steep point you can ask the computer to calculate further or new moves with
GO or AUTO PLAY.
15. SOUND (Turn sound on and off)
The acoustic signals of the chess computer can be switched on and off with the
SOUND button. If the chess computer has calculated a move, a tone will sound in any
case, which cannot be switched off.
16. SOLVE MATE (Solving chess problems)
The PRIMO can solve chess problems from mate-in-1 to mate-in-8. Castling, en
passant moves and all pawn promotions can be included in these mate problems.
However, solving mating tasks with higher numbers of moves can take a very long
time. However, this is not caused by the PRIMO, but by the enormously high number
of calculations that have to be carried out with such checkmate problems. Always
remember that no chess computer is able to find all checkmate solutions within its
solution possibilities.
Before starting the SOLVE MATE function, you must first enter the starting position
via SET UP. Before you start the mate search, it is advisable to use VERIFY to check
the correctness of the game position entered.
Entering the desired mate can be done by pressing the SOLVE MATE key multiple
times, or by pressing a square on rows 1 through 8, where row 1 squares are a mate-
in-1, row 2 squares are a mate-in-1. in-2 and so on. As soon as the display of the matt
to be set appears on the LCD
(e.g. with Matt-in-5 [n 5 ]), you can use the mate search with the
Start GO button. The computer then looks for a mate-in-5 or shorter. If it does not
find a solution, [ NO NE ] appears on the LCD. If he finds the solution, he shows the
key move. You can make any legal countermove and the computer will checkmate
you in the given number of moves.
17. EASY (Decreasing game strength)
The PRIMO uses the opponent's thinking time to calculate the further course of the
game, whereby he already includes the countermoves to be expected in his
calculations. By pressing the EASY button, the calculations of the computer can be
switched on or off during the opposing team's thinking time. After pressing the NEW
GAME button, EASY mode is switched off even if it was switched on during the
previous game. Especially for the beginner or weaker player, the EASY mode offers
another possibility to reduce the playing strength of the PRIMO.
18. AUTOPLAY (automatic gameplay)
The PRIMO's AUTOPLAY function offers an excellent opportunity for the computer
to independently analyze a game or game position. This is particularly useful when
analyzing at a higher level over a longer period of time. Enter SET LEVEL —> { to
set the game level } —> AUTOPLAY starts the
automatic gameplay. While the game is running automatically, the moves and the
game information are displayed via the coordinate LEDs and the LCD. However, the
figures do not have to be dragged along. The AUTOPLAY function is aborted by
pressing the GO key and the computer plays the next move, the result of which does
not have to correspond to the set playing level.
The AUTOPLAY function is not very suitable for following the computer's chess
game in all its details and learning from it. For this purpose, the individual moves are
called up for both sides with the GO button.
The result of the automatic analysis can be displayed by taking the moves back with
the TRACE BACK key and using them
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