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PRECISACOL
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PRECISACOL is a Bridge convention used in Duplicate bridge and devised by Anthony Bendeler in 2012. It is a Strong clubs system but heavily influenced by Acol and conventions used in Acol: the opening bids at level 1 are limited to a HCP range from 12 to 14. Several strong holdings are bid with 1♣, thus having similarities with strong clubs systems like Precision Club, hence the the name PRECISACOL. The major difference between Precision Club and PRECISACOL is that in PRECISACOL a 1♣ opening bid is not the only opening bid used for strong hands, since 2<font color="red">♦</font> and 2♣ are assigned to show certain strong holdings as well. The system has not been acknowledged by the World Bridge Federation yet, and effectiveness has to be proven still. Key elements are Weak Jumps, Key Card Swiss, Jacoby 2NT, Ambiguous Splinter, Weak NT and Rubensohl. 1♣ opening The system mainly revolves around this bid, because many semi-strong hands are opened with 1♣. Understanding this bid and continuances are important to learning this system. An opening bid of 1♣ shows several strong holdings: :*15-17HCP balanced :*20-22HCP balanced :*6+card major suit with 15-17HCP :*6+card major suit with 18-19HCP and a maximum of 7 quick tricks :*6+card minor suit with 8 to 9 quick tricks Responder has ONLY 3 ways of responding: :1<font color="red">♦</font>: artificial, relay :::1<font color="red">♥</font>: 6+ card <font color="red">♥</font>, 15-17HCP :::1♠: 6+ card ♠, 15-17HCP :::2♣: 6+ card suit, 8 to 9 quick tricks :::2<font color="red">♦</font>: 6+card suit, 8 to 9 quick tricks :::2<font color="red">♥</font>: 6+ card <font color="red">♥</font>, 18-19HCP with max 7 quick tricks :::2♠: 6+ card ♠, 18-19HCP with max 7 quick tricks :::1NT: 15-17 balanced (Niemeijer + transfers) :::2NT: 20-22 balanced (Niemeijer + transfers) :2♣: artificial, exactly 5 card <font color="red">♥</font>, good 10 to 15HCP (No 4 card ♠) :::2<font color="red">♥</font>: 4 card support, forcing ::::2NT: minimum values, no splinter ::::3<font color="red">♦</font>: ambiguous splinter ::::3<font color="red">♥</font>: maximum values, no splinter ::::3♠: ambiguous void ::::4<font color="red">♦</font>/4♣: 5 card suit :::2♠: 6+card ♠, 15-17HCP :::2NT: no fit, 17+HCP :::3♣: 6+ card suit, 8 to 9 quick tricks :::3<font color="red">♦</font>: 6+card suit, 8 to 9 quick tricks :::3♠: 6+ card spades, 18-19HCP :::3NT: no fit, 15-16HCP :::4<font color="red">♥</font>: to play :::4NT: Blackwood RKC 1430 :2<font color="red">♦</font>: artificial, exactly 5 card ♠, good 10 to 15HCP (No 4 card <font color="red">♥</font>) :::2<font color="red">♥</font>: 6+ card <font color="red">♥</font>, 15-17HCP :::2♠: 4 card support, forcing ::::2 NT: minimum values, no splinter ::::3<font color="red">♥</font>: ambiguous splinter ::::3♠: maximum values, no splinter ::::3NT: ambiguous void ::::4<font color="red">♦</font>/4♣: 5 card suit :::2NT: no fit, 17+HCP :::3♣: 6+ card suit, 8 to 9 quick tricks :::3<font color="red">♦</font>: 6+card suit, 8 to 9 quick tricks :::3<font color="red">♥</font>: 6+card <font color="red">♥</font>, 18-19HCP :::3NT: no fit, 15-16HCP :::4♠: to play :::4NT: Blackwood RKC 1430 As opposed to any other system, no other response is allowed, since that would make the weak hand declarer. If responder does not have the requirements to bid the artificial 2 in a minor suit, he must ALWAYS relay with 1<font color="red">♦</font>. When opener is balanced, the responder always has an opportunity to transfer his suit. Whenever opener rebids his suit at level 2 and responder holds a suit of his own or wants to play 3NT, he must always bid negative 2NT first if he cannot bid the suit at level 2. Bidding a suit directly at level 3 may confuse opener if that bid is assigned to a slam related bid, like Ambiguous Splinter. Opener will rebid as low as possible whenever responder bids a negative 2NT. A new suit by responder after negative 2NT will then show slam interest with the suit bid as trump suit. The more underlying reason why responder can't bid a suit directly on level 3, is because opener already showed an unbalanced hand. If opener were interested in any other suit as trump, he would have made a balanced bid. Like with most strong clubs systems, the 1C opening can be aggressively overcalled. Without proper defense, such systems would become unstable and eventually useless. Depending on the overcall, there are several biddings that counter these overcalls. This next section will explain what to do in every possible overcall Simple level 1 overcall pass = 0-7HCP double = game forcing Rubensohl = long suit (weak or strong) Strong level 2 jumps pass = waiting bid double = penalty double NT = natural Rubensohl = long suit (weak or strong) (conventional) Weak level 2 jumps below 2♠ pass = waiting bid, usually game values double = penalty double NT = natural Rubensohl = long suit (weak or strong) 2♠ = 12+HCP, forcing :2NT = balanced 15-17 ::3♣ = Puppet Stayman :3♣ = 5 card ♣ and 15-17HCP :3<font color="red">♦</font> = 6+ card <font color="red">♦</font> :3<font color="red">♥</font> = 6+ card <font color="red">♥</font> :3♠ = 6+ card ♠ :3NT = balanced 20-22NT ::4♣ = high level Puppet Stayman Weak jump overcalls ranging from 2♠ to 3<font color"red">♥</font>=== pass = game values double = penalty double NT = natural 3♠ = 12+HCP, forcing :3NT = 15-17HCP ::4♣ = high level Puppet Stayman :4♣ = 5 card ♣ and 15-17HCP :4<font color="red">♦</font> = 6+ card <font color="red">♦</font> :4<font color="red">♥</font> = 6+ card <font color="red">♥</font> :4♠ = 6+ card ♠ :4NT = balanced 20-22NT ::5♣ = 0 or 3 keycards ::5<font color="red">♦</font> = 1 or 4 keycards ::5<font color="red">♥</font> = 2 keycards Weak jump going from 3♠ and higher pass = round forcing, invite to double if balanced or bid your 6+ suit double = penalty double 3NT = natural 4NT = Blackwood 1430 The logic behind the conventional ♠ response, is that ♠ is the highest ranking suit, therefore overruling any weak jump made by overcaller. With ♠ showing at least opening values, double keeps its natural meaning, while pass shows game values. Since ♠ shows opening values, the disadvantage in responder being declarer is rarely a disadvantage when holding most HCP. However, partnership must always be cautious for the Lightner double if slem is bid. 1<font color"red">♦</font> opening== A 1<font color="red">♦</font> opening bid shows 12-14HCP with at least a 5 card. Responses are natural with weak jumps and slam related jumps: ::New suit = natural ::Jump new suit = non-forcing ::Inverted raise ::2NT = Jacoby 2NT for diamonds (16+) ::::3♣ = splinter ::::3<font color="red">♦</font> = 6+card suit ::::3<font color="red">♥</font> = splinter ::::3♠ = splinter ::::4♣ = 5 card suit ::::3NT = weak hand, to play ::3♣ = ambiguous splinter ::3<font color="red">♥</font> = key card swiss (equivalent to 4♣ key card swiss) ::3♠ key card swiss (equivalent to 4<font color"red">♦</font> key card swiss) ::3NT = ambiguous void 1<font color"red">♥</font> opening== A 1<font color="red">♥</font> opening bid shows 12-14HCP with at least a 5 card. ::New suit = natural ::2♠ = non forcing ::Jump raise = preempt ::3<font color="red">♦</font> = ambiguous splinter ::2NT Jacoby 2NT for <font color"red">♥</font> (16+) ::3NT = ambiguous void ::4♣ = key card swiss ::4<font color="red">♦</font> = key card swiss 1♠ opening A 1♠ opening bid shows 12-14HCP with at least a 5 card ::New suit = natural ::Jump raise = preempt ::3<font color="red">♥</font> = ambiguous splinter ::2NT = Jacoby 2NT for ♠ (16+) ::3NT = ambiguous void ::4♣ = key card swiss ::4<font color="red">♦</font> = key card swiss 1NT opening A 1NT opening bid shows 12-14HCP, possibly unbalanced with long clubs. After 1NT, Stayman Relay and transfers are used. Minor suit asking may be used as well if responder is interested in the minor suit holdings of opener. Interference is countered with Rubensohl. A penalty double is countered with SOS redouble, forcing opener to bid his lowest 4+card suit. 2♣ opening A 2♣ opening bid promises one of the following hands: *::18-19HCP and balanced :::: Niemeijer complex *::6+ card major with 8 to 9 quick tricks: :::: 2NT = negative and round forcing :::: Key Card Swiss, Ambiguous Void are also used :::: everything else = 8+ and game forcing *:: a 6+ card major suit with 8 or 9 quick tricks 2<font color"red">♦</font> opening== A 2<font color="red">♦</font> opening promises one of the following hands: *::4+ card ♠ + <font color="red">♥</font> 6-11HCP :::2NT: game forcing ::::3♣: minimum values (6-9) :::::3<font color="red">♦</font>: game forcing ::::::3<font color="red">♥</font>: 4 card <font color="red">♥</font> + 5 card ♠ ::::::3♠: 4 card ♠ + 5 card <font color="red">♥</font> ::::::3NT: 4 card ♠ + <font color="red">♥</font> ::::3D: maximum values with 4 card ♠ + <font color="red">♥</font> ::::3<font color="red">♥</font>: maximum values with 4 card <font color="red">♥</font> + 5 card ♠ ::::3♠: maximum values with 4 card ♠ + 5 card <font color="red">♥</font> ::::3NT: 5 card ♠ + <font color="red">♥</font> *:: a 6+ minor suit with 9 to 10 quick tricks *:: a strong hand with 23+HCP 2♠ / 2<font color"red">♥</font> opening== A major 2 opening bid shows at least a 5 card suit with less than 12HCP. Every bid by responder is natural and shows a good suit with decent values. Opener must pass. The only forcing bid is 2NT, which shows game interest: :3♣ = 5 card major suit bid + 4 card suit in second unknown suit (9-11HCP) ::3<font color="red">♦</font> = relay :::3<font color="red">♥</font> = 4 card ♣ :::3♠ 4 card <font color"red">♦</font> :::4♣ / 4<font color="red">♦</font> = 5 card major suit bid and 5 card minor suit bid :3<font color="red">♦</font> = 6 card major suit bid and minimum values (6-9HCP) :3rebid = 6 card major suit bid and maximum values (10-11HCP) :3NT = 5 card major suit bid and balanced (9-11HCP) 2NT opening A 2NT opening bid is an Unusual notrump bid, showing both minor suits. 3NT opening A 3NT opening bid is Gambling 3NT showing at least a 7 card minor suit with all honneurs in that suit. 4NT opening A asks for a specific ace and shows an extremely strong one-suiter, enough to bid at least at level 5. Disadvantages vs. Advantages The biggest disadvantage of this system is that long ♣ cannot be bid using a natural bid, unless the hand holds 8 to 9 quick tricks. This must be compensated through weak NT, which then shows 12-14HCP and possibly unbalanced. Also, since Puppet Stayman is used after a 1NT rebid, responder may use minor suit asking if opener does not show majors after Puppet Stayman. In this way, discovering the long ♣ is still possible. The advantage remains that several semi-strong hands can be bid very precise at a low level. ALso, agressive weak overcall jumps defense is integrated into the system. partnership agreements PRECISACOL may be modified according to partnership agreements. For example, the level 2 opening bids may be assigned to alternative conventions, such as Multi 2 diamonds or Muiderberg. Also, ambiguous splinter bids may be replaced by direct cue bids. external links http://precisacol.blogspot.nl/2012/11/precisacol-by-anthony-bendeler-27-11.html http://www.bridgebum.com/acol_4nt.php 
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