Psion Chess as a UCI engine

[Jim Ablett]

Hi Jim,

Claude claims to have fixed the issues... Can you try the binary again?

https://github.com/vdbergh/psion-chess/ ... s/tag/v1.1

Thanks!

Hi Michel,

Castling bug fixed now. Many thanks for doing this. Psion Chess was the very first computer chess program I ever played
and was always a favourite of mine. Very strong for the time.



Jim.

[Damir]

Hi Michel and Jim,

I have desktop version of Chess Genius 7.2 GUI, but it does not work on Windows 11. Author of the engine is the same one as of Psion Chess (

Richard Lang)

Richard Lang wrote back than that it only works on older versions of Windows 7 as 32 bits. If I send Chess Genius 7.2 engine to you, alongside with its GUI, would you be able to convert it to 64 bit Windows 11, so I am able to use it.

If I try and load it now, I get an error message that the Chess Genius 7.2 is not compatible with my version of Windows.

I have tried and write a message to Richard Lang himself, but he has never responded to any of my messages.

[Rowen]

Hi Michel and Jim,

I have desktop version of Chess Genius 7.2 GUI, but it does not work on Windows 11. Author of the engine is the same one as of Psion Chess (

Richard Lang)

Richard Lang wrote back than that it only works on older versions of Windows 7 as 32 bits. If I send Chess Genius 7.2 engine to you, alongside with its GUI, would you be able to convert it to 64 bit Windows 11, so I am able to use it.

If I try and load it now, I get an error message that the Chess Genius 7.2 is not compatible with my version of Windows.

I have tried and write a message to Richard Lang himself, but he has never responded to any of my messages.

Hi
I also cant get it to work with windows 11, tried it in the FRITZ 12,14,19, gui and Deep Shredder 13 GUI.

[Damir]

It will only work with Windows 7 32 bits version. Newer version of Windows who are supporting 64 bits, it will not work on, even if they are 32 bits. Chess Genius 7.2 is only for Windows 7 32 bits or even Vista 32 bits, everything above that, and the engine along with the GUI would not work. We need 64 bits compatible GUI and engine to work on Windows 11.

[Damir]

https://chessgenius.com/pc/index.html

ChessGenius Classic. For desktop and notebook PC's running Windows 98, NT, ME, 2000, XP, Vista (all 32 bit versions) and Windows 7 (all 32 bit versions)
ChessGenius made headlines all around the world by beating the human World Champion, Gary Kasparov, at the Intel World Chess Grand Prix in London.

Version 7.2 compatible with Windows Vista and Windows 7 (32 bit versions only). It is a free update for all registered users of ChessGenius Classic 7.0 and 7.1. Install over the previous version. No need to enter License Key again

[Michel]

The engine now shows info lines!

https://github.com/vdbergh/psion-chess/ ... s/tag/v1.2

[peter]

Hi! Thanks for Psion UCI!
Did let a little match run between it and Franz Huber's emulation of Mephisto TM London 68040 at TC 5"/move in Shredder- GUI, too strong an opponent obviously, broke off after 27 games with 25 wins for Mephisto and 2 draws, yet Psion 1.1 won 2 times too, here's one of these 2 games:
[pgn]
[Event "0:05 Minuten/Zug"]
[Site "Engine Match"]
[Date "2026.10.20"]
[Round "1"]
[White "Mephisto TM London 68040 (experimental)"]
[Black "Psion Chess 1985"]
[ECO "D26"]
[Result "0-1"]

1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. Qe2
Nc6 7. O-O cxd4 8. Rd1 Bd6 9. exd4 O-O 10. Nc3 a6 11. d5
exd5 12. Nxd5 Nxd5 13. Bxd5 Qc7 14. Qc4 Bf5 15. Be3 Rad8
16. h3 h6 17. Nh4 Bh7 18. Rac1 Bh2+ 19. Kf1 Be5 20. Rd2 Rc8
21. Nf3 Bf6 22. Qg4 Kh8 23. b3 Rfd8 24. Rdd1 Bb2 25. Rc5
Qe7 26. Rc4 Qc7 27. Rd2 Bf6 28. Kg1 Bg6 29. Nh4 Bb1 30. a3
Be5 31. Nf3 Bf6 32. Rc1 Bg6 33. Qc4 Qe7 34. Bb6 Re8 35. b4
Qd7 36. Qf4 Ne5 37. Rxc8 Qxc8 38. Re2 Nxf3+ 39. Bxf3 Rxe2
40. Bxe2 Qc6 41. Bc5 Qe6 42. Qe3 Qxe3 43. Bxe3 b5 44. Bf3
Bb2 45. Bb7 Bd3 46. Bxa6 Bxa3 47. Bc5 g5 48. Bb7 Kg7 49. g3
f5 50. Bc6 Bc1 51. Bd4+ Kf7 52. Bd5+ Ke7 53. Bc3 h5 54. Kg2
g4 55. h4 Be4+ 56. Bxe4 fxe4 57. Kf1 e3 58. fxe3 Bxe3
59. Ke2 Bb6 60. Be5 Bd8 61. Kd3 Ke6 62. Bb8 Be7 63. Kc3 Kd5
64. Bf4 Ke4 65. Bc7 Bf6+ 66. Kd2 Kd4 67. Bd6 Kd5 68. Bf4
Bg7 69. Kd3 Bf8 70. Bd2 Bd6 71. Be1 Be5 72. Ke3 Bc7 73. Kf2
Kd4 74. Ke2 Bd6 75. Kf2 Kd3 76. Kg2 Ke2 77. Bc3 Be7 78. Bd4
Bxb4 79. Be5 Bc5 80. Bc3 b4 81. Bh8 b3 82. Bb2 Kd3 83. Kf1
Bd4 84. Ba3 Kc2 85. Ke2 Bc5 86. Bxc5 b2 87. Be3 b1=Q
88. Bf4 Qb3 89. Be3 Qd5 90. Kf1 Qh1+ 91. Kf2 Qf3+ 92. Kg1
Qxg3+ 93. Kf1 Qxe3 94. Kg2 Qf4 95. Kg1 g3 96. Kg2 Qf2+
97. Kh1 Qf1# 0-1
[/pgn]
Pity this one version without output- lines always get comment "book" with each move by GUI, same as with Mephisto- emu, so it can't be said, how many moves came really out of book, but in meantime I updated to 1.2 and having only short trial so far, now output seems to work in Shredder- GUI well too

[Juan P. Naar]

Hi Michel and Jim,

I have desktop version of Chess Genius 7.2 GUI, but it does not work on Windows 11. Author of the engine is the same one as of Psion Chess (

Richard Lang)

Richard Lang wrote back than that it only works on older versions of Windows 7 as 32 bits. If I send Chess Genius 7.2 engine to you, alongside with its GUI, would you be able to convert it to 64 bit Windows 11, so I am able to use it.

If I try and load it now, I get an error message that the Chess Genius 7.2 is not compatible with my version of Windows.

I have tried and write a message to Richard Lang himself, but he has never responded to any of my messages.

Chess Genius 7.2 doesn't work in 64 bit Windows because the engine is still 16 bits, Richard never updated it to 32 bits.

[Michel]

v1.3 with expanded README.

https://github.com/vdbergh/psion-chess/ ... s/tag/v1.3

[Michel]

v1.4 The engine is now stopped when not thinking (before it still consumed 90% CPU time when idle)

https://github.com/vdbergh/psion-chess/ ... s/tag/v1.4