Fortunately, it was just a glue joint! Imagine that - I had trouble gluing joints. Anyway, my 'signature' chessboard started to crack at a joint and eventually you could see through the crack. The board had a border so it was a matter of removing the border on all sides and then carefully running a knife down the cracked seam until I got a clean break. I'm considering the surgery a success. I'm hoping the recovery phase (adding a new border) will be a success as well.