I want to join these four 1.8 cm thick beechwood boards as one can see on the picture. My idea is to join at the **B** points with biscuits but I’m not sure what to do about the **A** points. It needs to be a very firm join so that the table is not wiggly. Besides that I’m not sure at which height (the questionmark) the middle board between the **A** points would provide best solidity.

![Table](https://i.stack.imgur.com/w7cDq.png)

Update
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![Two boards](https://i.stack.imgur.com/EEGWI.png)

Photo
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There it is! Thanks for your advices.

![enter image description here](https://i.stack.imgur.com/rCGVi.jpg)