Yes, massive speed-up can result in memory overflow with unexpected depth reached, or as well data value overflow, such as:
byte 7F=127
+1 = -128

word 7FFF=32767
+1 = -32768

Grüße,
Eric

Wie gesagt, das hat nichts mit der Beschleunigung zu tun. Es sollte nicht der Eindruck entstehen, dass der Hersteller die Geschwindigkeitsschraube überdreht hat.

Spezielles Beispiel
Mein Mephisto Exlusive III -S Seriengerät (spielt mit Weiß) hängt sich während der Rechnung des letzten Zuges LC1-E3 (auf Stufe 9) nach etwa 16 Minuten auf (erwartete Fortsetzung LC8-E6).
Beim Mephisto Phoenix geht es natürlich aufgrund der hohen Geschwindigkeit wesentlich schneller. Er spielt in der Grundeinstellung Lc1-e3 und danach kommt in der Ponder-Zeit diese 0.0.:8.4-Anzeige. Bei einer höheren Rechenzeit-Einstellung würde der Fehler während der Rechnung auftreten.

1. e2-e4 e7-e5
2. Sg1-f3 Sb8-c6
3. Lf1-b5 a7-a6
4. Lb5-a4 Sg8-f6
5. 0-0 Lf8-e7
6. Dd1-e2 b7-b5
7. La4-b3 0-0
8. d2-d3 d7-d6
9. Sb1-c3 h7-h6
10. Lc1-e3

Aber wie Sascha bereits gesagt hat: Das ist selten - und in den allermeisten Fällen nach deutlich längeren Rechenzeiten als hier. Das ist ein besonderes Negativ-Beispiel.

Gruß,
Wolfgang

Seit 13:45 Uhr liegt meine Sendung in der von mir gewählten Postfiliale zur Abholung bereit.
Leider machte diese heute schon 14:00 Uhr zu.
Unschwer zu erraten, wo ich Montag Morgen sein werde.

Gruß
Rüdiger

__________________
shine on...

Hallo Rüdiger,
Du musst den positiven Aspekt sehen: DHL ist Dir dabei behilflich, dass Du Dein Weihnachtsgeschenk nicht zu früh auspackst ... nicht, dass Du noch in Versuchung kommst ...

Gruß,
Sascha

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This post may not be reproduced without prior written permission.
Copyright (c) 1967-2025. All rights reserved to make me feel special. :-)

Wenn ich das Teil erst einmal zu Hause habe, kann ich mit Sicherheit nicht widerstehen!!!

__________________
shine on...

Hi all,

I’m finally online thanks to Micha …

Apologies for my English ..

My Mephisto Phoenix arrived a few days ago, I’ll post a couple of pictures of what I’ve managed to add so far soon …

Al

__________________
My Chess Computers
Picochess v3 on YouTube

Hi Al,

That's not a problem. As promised, I will try to translate more phrases in the forum.

If you have any problems, just ask.

Regards
Micha

Es kommt drauf an, welches Weihnachten gemeint ist.
Wer schon länger wartet, kann ja sein Geschenk von Weihnachten 2021 öffnen oder sein Geburtstagsgeschenk von diesem Jahr.

Hi all,

My Mephisto Phoenix arrived on Wednesday.

I’ve already had it apart to get access to the micro sd card, I now have a micro sd card extension and the card is now accessible outside the case, conveniently through the slot provided at the rear.

The sd card is split into 3 drives, a boot drive, an encrypted drive where all the menus etc are based and a data drive that contains the Engines, Books and some other interesting data.

I have access to the 1st and 3rd drives, but need root access for most of the 2nd drive.

The Operating system is 32bit Raspbian Buster and Stockfish 15.0 is a RPi binary compiled with gcc-8.3.0 on the 26th of July 2022:
“Stockfish 260722 by the Stockfish developers (see AUTHORS file)”

The other 3 Engines are not Raspberry Pi binaries, I already knew this as I had contacted all 3 authors prior to receiving my Phoenix. I don’t think they are Windows binaries, so probably Linux.

I noticed that out of the 5 supplied books, the fun book was exactly the same as our fun book on Picochess. So I added a Gambit book, which immediately showed on boot and is selectable. When I added another book, this didn’t show. However if I renamed the gambit or another book, it showed. So obviously the menu is set to show 6 books. I can’t change this without access to the encrypted data on drive 2.

So the books worked, so I set about adding another Engine. I compiled Stockfish 15.1 using the same gcc-8.3.0 and Buster that was used for v15.0. I noticed that some of the UCI options were changed in v15.0 so I matched these in v15.1. There is also a file named ‘pcs_dat_engsandr‘ that contains the uci options for all engines, Stockfish v14 was also in there, so they must have changed to Stockfish v15 quite late in the day. I added Stockfish 15.1 to this file and rebooted. It didn’t show, so the menus must only allow 4 Engines. I altered the name of the Stockfish 15.0 engine and renamed my 15.1 to 15.0 and rebooted.

As I don’t have access to the menus the engine still showed as Stockfish 15.0, but I knew it was 15.1 and it runs faultlessly. So theoretically I could add any Engine but it would have to show as Stockfish 15.

Here’s a few pictures …






(Click on a thumbnail for a larger image)

Cheers,

Al

__________________
My Chess Computers
Picochess v3 on YouTube

My dear old friend Al,

you can't leave away your fingers to make any chess computer even better.
Welcome to this forum!

Yours, Jürgen