The Chile-Peru show at The Hague begins today. An interesting tidbit.
Bolivia has also said it will send a delegation to the court and plans a lawsuit to try to reclaim its ocean access from Chile.
So if Chile loses, Bolivia will file a lawsuit quickly, and the delegation may well already have a copy on hand. The problem is that the ICJ requires the participation of both governments, and I cannot imagine a scenario whereby the Chileans would agree. They are participating now primarily because they are convinced they will win.