 It is that contract that cannot be improved upon by further bidding nor could it have been improved upon by taking a different line in earlier bidding.At Chicago or IMP scoring it is generally worth bidding game even with a slightly less than 50% chance of success due to the relatively high value of the bonuses (especially when vulnerable).In duplicate pairs scoring, the subtle difference between a major suit game, a NT game and a minor suit game make the declaration an important decision.