Dear BBO, can you please make the undo-requests invisible to the partner of the requester? It is being abused all the time. Just one particularly egregious example: N opens 2S, E passes, S passes. Now E asks for an undo, which is rejected. W now bids 2NT on 3-3-5-2 7 count (without S stopper)! E raises to 3nt, which makes. Similar cases abound.