I am sorry, it took a while, but now I found a workaround to use Cray Blitz as UCI engine with only one configuration for both sides.

Extract the archive in the Cray Blitz folder and use CrayBlitzUCI.exe as engine: https://www.mediafire.com/file/oiln4...tzUCI.zip/file

Adjust the thinking time in CrayBlitzWB.ini in this line:

In the following 20 lines contain the thinking time for the 1st move. Usually CrayBlitz uses it's book, so I'd say it is not necesarry to change this as well.

You can play full games without external book, but you have to restart the engine after every game. It works for 199 moves, if you want to increase that, go to the end of the CrayBlitzWB.ini, you well see what you have to do :-)

This works stable for me under Arena 3.5.1 and should work in other GUIs as well.

For Arena 3.5.1 you can also use this WB configuration: https://www.mediafire.com/file/0hlal...itzWB.zip/file

For this configuration you have to adjust the thinking time after "st=" here:

It will likely not work in other GUIs. Advantage is, that the analysis includes depth and eval. Beside that you should be able to switch sides during a game. But if you do that, Cray Blitz uses the book only for the side it started the game.

Both played just 100 automated games without problems, hope this works for others as well. The whole configuratuion is a little bit shaky because it depends on the time and order of the commands from the UI.