[surferguy]

that is a board with a heap of stress on it. Wow.

My theory is the flat grain walnut border caused this issue, it is going to expand and contract differently than the end grain center area. They wanted to move in different directions but were locked in with the glue. The result is a catastrophic failure when the tension was too great.

You could try and dump a bunch of glue down the crack and use a shop vac to suck it down into the fissure, then use a bunch of clamps and see if you can pull it back together.

This particular design may have benefited from a full immersion soak every month or two vs just a top coat.

I haven’t seen a failure like this before and there are surely other people that will know more about this than me but that is my assessment.

All that said - it’s a nice board!