v1.4.1 The engine is also stopped after mate or draw.
https://github.com/vdbergh/psion-chess/ ... tag/v1.4.1
Psion Chess as a UCI engine
Moderator: Ras
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Michel
- Posts: 2329
- Joined: Mon Sep 29, 2008 1:50 am
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Michel
- Posts: 2329
- Joined: Mon Sep 29, 2008 1:50 am
Re: Psion Chess as a UCI engine
Could someone edit the CPW page on Psion Chess https://chessprogramming.org/Psion to add a link to the repository:
https://github.com/vdbergh/psion-chess
Thanks!
https://github.com/vdbergh/psion-chess
Thanks!
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Michel
- Posts: 2329
- Joined: Mon Sep 29, 2008 1:50 am
Re: Psion Chess as a UCI engine
v1.5 Much less overhead. TC 10+0.1 now works.
https://github.com/vdbergh/psion-chess/ ... s/tag/v1.5
https://github.com/vdbergh/psion-chess/ ... s/tag/v1.5
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Michel
- Posts: 2329
- Joined: Mon Sep 29, 2008 1:50 am
Re: Psion Chess as a UCI engine
Psion Chess plays on lichess.
You can challenge it at
https://lichess.org/@/psion-chess
For now this just runs on my laptop. So it may go offline at any time. I will look for a more permanent home.
You can challenge it at
https://lichess.org/@/psion-chess
For now this just runs on my laptop. So it may go offline at any time. I will look for a more permanent home.
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Michel
- Posts: 2329
- Joined: Mon Sep 29, 2008 1:50 am
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Essay
- Posts: 11
- Joined: Fri Apr 10, 2020 10:27 pm
- Full name: Sophie Abbot
Re: Psion Chess as a UCI engine
Hi Michel,
It's fascinating to see some of these very early micro-computer chess programs brought back to life.
We also have Steve Maughan's post regarding Richard Lang's Cyrus IS Chess and also Bill Forster's work on Dan and Kathe Spracklen's Sargon chess program from 1978 and his new follow-on project - an updated version he's calling Zargon.
It's fascinating to see some of these very early micro-computer chess programs brought back to life.
We also have Steve Maughan's post regarding Richard Lang's Cyrus IS Chess and also Bill Forster's work on Dan and Kathe Spracklen's Sargon chess program from 1978 and his new follow-on project - an updated version he's calling Zargon.
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Michel
- Posts: 2329
- Joined: Mon Sep 29, 2008 1:50 am
Re: Psion Chess as a UCI engine
v1.7 "position fen" now works so that EPD opening books can be used.
The README also contains some test results.
https://github.com/vdbergh/psion-chess/ ... s/tag/v1.7
I suppose this project is now essentially complete. I only need to find a more permanent home for the bot. I'll probably rent a server. I was going to do that anyway.
The README also contains some test results.
https://github.com/vdbergh/psion-chess/ ... s/tag/v1.7
I suppose this project is now essentially complete. I only need to find a more permanent home for the bot. I'll probably rent a server. I was going to do that anyway.
Last edited by Michel on Fri Oct 23, 2026 1:51 pm, edited 1 time in total.
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Michel
- Posts: 2329
- Joined: Mon Sep 29, 2008 1:50 am
Re: Psion Chess as a UCI engine
Yeah with the advent of AI such projects have become much easier... This port of Psion Chess was essentially trivial. I only needed to give Claude a few instructions and that was it.Essay wrote: ↑Fri Oct 23, 2026 12:55 pm Hi Michel,
It's fascinating to see some of these very early micro-computer chess programs brought back to life.
We also have Steve Maughan's post regarding Richard Lang's Cyrus IS Chess and also Bill Forster's work on Dan and Kathe Spracklen's Sargon chess program from 1978 and his new follow-on project - an updated version he's calling Zargon.
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Michel
- Posts: 2329
- Joined: Mon Sep 29, 2008 1:50 am
Re: Psion Chess as a UCI engine
Does anyone here know Richard Lang personally?
I have emailed him several times, asking if I could distribute the DOS program Psion Chess with https://github.com/vdbergh/psion-chess/ (or provide some other method to make it automatically available to the project) but he has not replied so far. ChessGenius for DOS is a free download (http://chessgenius.com/cg3dos/index.html) but this appears not to be the case for the older Psion Chess.
I have emailed him several times, asking if I could distribute the DOS program Psion Chess with https://github.com/vdbergh/psion-chess/ (or provide some other method to make it automatically available to the project) but he has not replied so far. ChessGenius for DOS is a free download (http://chessgenius.com/cg3dos/index.html) but this appears not to be the case for the older Psion Chess.