CS System

CS System is a bridge bidding system, was invented by Mr. Chaitad Suriya, who was Thai national team. CS stands for "Complete System" and also "Chaitad Suriya". By a word "Complete", the system integrates points, shapes, and losers altogether.

Fundamental

Opening	HCP	Losers	Details
1♣	13-18	5-7	♣ (0+), unbalanced hand, no 5 cards major
1♦	16-21	4-6	♦ (0+), any distribution
1♥, 1♠	12-15	5-7	5-cards suit unbalanced hand
1NT	13-15	7-8	balanced or semi balanced hand
2♣	21+	0-4	balanced or semi balanced hand
	16+	0-3	any distribution unbalanced hand G/F
2♦	6-12	7-8	♥ or ♠ (6+), weak
2♥, 2♠	12-15	5-6	6-cards suit unbalanced hand with two top honors or three of five
2NT	21-22		balanced or semi balanced hand
3♣	12-15	3.5-4.5	♣ 5-cards + ♥ or ♠ 5-cards
3♦	12-15	3.5-4.5	♦ 5-cards + ♥ or ♠ 5-cards
3♥, 3♠	6-12	6-7	7-cards suit preemptive
3NT		4-5	Gambling, solid 7-card minor suit leading with AKQ, no more than 1 K outside
4♣	12-15	3.5-4.5	♣ 5-cards + ♦ 5-cards
4♦	12-15	3.5-4.5	♥ 5-cards + ♠ 5-cards

Advantages

• System is more precise than other systems which have wide range of points. CS System range is 3 or 6 points in opening bid and 3 points in first rebid with clear distribution, the responder completely knows the potential contract which is either part score or game.
• System is not vulnerable to preemptive bids and overcalls. According to limited range of points and clear distribution, a player completely knows the hand and can place the right contract.
• System provides more information for bidding game and slam not only from points. Because the system incorporates number of losers into a hand in every bidding, a responder can easily use cover cards to find the chances of game and slam.