The Ogust convention

A 2NT bid over a weak-2 opening asks opener to describe his hand more precisely. The responses are as follows:

Response	Meaning
3C	Low HCP and weak suit
3D	Low HCP and strong suit
3H	High HCP and weak suit
3S	High HCP and strong suit
3NT	Suit headed by AKQ

In the above, low HCP means 6-8 while high HCP means 8-10. On the other hand, a weak suit means holding one of AKQ while a strong suit means holding two of AKQ.

If responder bids a new suit after opener's response to Ogust, this shows a strong hand and is game forcing.

If responder bids 4C after opener's response to Ogust, it is Gerber and implies no major fit.

The Ogust system is still ON if opponent has overcalled the weak-2 opening. If the Ogust convention is interfered, the I-DO rule applies.