Peter Heine Nielsen (@PHChess) asked on Twitter (2 September 2020):

"Is there any possibility in Chessbase to disable the rules of chess? Meaning you can just move around freely, and even capture your own pieces? Or another program allowing you to do so?"

I replied that the answer to the last question is yes and that the Chess Suite has such a tool. It belongs to the features on endgames and endgame studies, and was not mentioned here before 4 September 2020.  

The tool is named Setalyser (a combination of Set-up and Analyser) and it was invented for the analysis and modification of endgame positions, for composing endgame studies, so to speak.

This is how the tool looks like when it is started.

Since the position is invalid, the analysis component at the bottom is grayed out. As soon as the position is valid, it will look more like this:

In game mode, it looks very similar to the game browser and shares many of its functions.

As you can see, the Setalyser, like the game browser, has the screenshot and clipboard icons on the right-hand side of the menu bar. Moreover, a right-click in the text area for the moves opens the same context menu which can be used to comment and modify the game.

In fact, I thought more than once about including the set-up function into the game browser. It's technically easy, and then we would only have one tool instead of two. But these two tools are already complicated enough, and the new one would be even more complicated, wouldn't it? That's why I've improved the interaction between both tools over the last few years. You can now open the other from each of the two tools, whereby the relevant data will be transferred or generated.