Why did Gib decide on X, rather than normal forcing 2!h? Gib also decided no to show his 5 card major later.....in normal bidding Gib bidding would deny more than 4 hearts completely.
Second issue is why Gib bids cuebids instead of NT with stoppers, and what is a "likely stop" (almost pregnant style?)? There is not exactly much room between 3♠ to 3NT to find out how likely is "likely stop".

Help

