To recap: if they bury two or more suit-showing bids, or reach 1NT before we show a suit, they disturb a neutral auction. If we pass after partner has called, or if our first suit-showing bid is 2
or above, we disturb a neutral auction.
A lot of bidding space can be lost quickly in disturbed auctions, and the system needs to shift to more practical, less exact methods. For example, when the opponents are bidding their socks off, delicate searches for grand slams will often have to be put aside for more brutal stabs at six.
Chilli adopts almost a new system with very few rules and conventions, based on aggressive natural bidding and modern competitive principles such as the law of total tricks.