Computer Oriented Bridge Analysis, is the resultant bidding system founded on computer evaluation of the evaluation and distributional factors of card combinations. To some degree the Cobra system is related to the Schenken Club after certain refinements were made to the computer result. The Cobra system adheres to its own hand evaluation methods, which were entered into the computer for analysis, and these methods set precise limits on bids. However, the high card point ranges are to a degree only approximations, give or take a few percent and the ranges for No Trump openings and the 2 Diamonds opening were independantly assigned. The system is precisely defined, which makes it possible for computers to use it.