From b7a05293a09a1b5ebe5ce5169068d5b756837ee7 Mon Sep 17 00:00:00 2001 From: Matthew Vernon Date: Mon, 8 Jun 2020 13:27:48 +0100 Subject: [PATCH] First complete system draft - 2012-01-04 This was posted to DW/LJ on 2012-01-10 --- convention.txt | 208 +++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 195 insertions(+), 13 deletions(-) diff --git a/convention.txt b/convention.txt index f2a1c79..3da4d0a 100644 --- a/convention.txt +++ b/convention.txt @@ -1,4 +1,8 @@ -Magic numbers: +* Executive summary: + +Acol, 12-14 1NT, Strong twos, transfers, roman key card blackwood + +* Magic numbers: Part score: 19-24 points 3NT / Major game: 25+ @@ -8,20 +12,198 @@ Suit small slam: 31+ Suit grand slam: 35+ 7NT: 37+ -Opening: +* General notes: +new suits often force for one round +jumps to game are usually "shut up" +"invitational to x" means bid x if maximal for previous bid +"support" is usually 4 cards +if you make a limit bid, you usually shut up unless forced + +** Opening ** + +Opening points are 12, and/or rule of 20 (points + lengths of two +longest suits); 11 or 19 if you feel aggresive / it looks good + +1 [suit] promises at least the above - generally pick the longest suit +1NT is 12-14 points balanced (limit) +2C is 23+ points, at least 5 quick tricks. Usually game-forcing +2 [other] has one 6- or two 5-card suits, >=8 playing tricks. 1r force +2NT is 20-22 points balanced (limit) +3 [suit] pre-empt 7-card suit 7-9ish points +3NT pre-empt solid (AKQ at least) 7-card minor "Weak Gambling 3NT" +4 [suit] pre-empt as 3, but 8-card suit + +(with 15-19 points balanced, open 1[suit] and rebid xNT - see below + +** Replying ** + +* Reponse to 1 [suit] + +pass - <6 points +2 [suit] - support, 6-9 points (limit) +3 [suit] - support, 10-12 points (limit, invites game) +4 [suit] - pre-empt. 5+support, 6-10 points (to play) +xNT - denies support for partner (other responses do not) +1NT 6-9 points (doesn't need to be balanced), no 2-level bid (limit) +2NT 10-12 points, balanced (limit) +3NT 12-15 points, balanced (limit) +1 [new] 6+ points, 4+ cards, 1-round force +2 [new < suit] 8-9+ points, 5+ cards, 1-round force +jump [new] 16+ points, 5+ cards (or support), game force + +* Response to 1NT + +pass - <11 points, no long suit +2C - Stayman (bid 2 of a 4-card major or 2D if none) +2D/2H - Transfer (3 of next suit if 4+card and maximal, 2 of next otherwise) + [a break (3 of unexpected suit) shows maximum and xx in bid suit] +2S - 11 points or long minor (bid 2NT if minimum, 3C if maximum) +2NT 12 points; invites game if opener maximal +3 [suit] - 5 cards in suit, forcing 1 round + [in a minor, this is a thinking-about-slam bid, in a major, aiming + for 3NT if you have 2 in the suit, 4[suit] with 3 or 4 cards] +4H/4S - 6-card suit. to play +3NT/6NT - to play +4NT - invitational to 6NT if maximum +5NT - invitational to 6NT unless minimum + +* Response to 2NT + +3C - Stayman (as before, but forcing to game) +3 [suit] 5-card suit, forcing to game +others, as per 1NT + +* Response to 2C (all game-forcing except 2C-2D-2NT (23-24 balanced)) + +2D - negative (<8 points) +2NT - balanced, 8+ points, game-force +2 [suit] 5-card suit with an honour ~7+ points. game-force +3 [suit] decent 6-card suit. game-force + +* Response to 2[suit] + +2NT - negative +[new] - 5+ cards, 8+ points. game-force +3[suit] - 3+support, 5-8 points. game-force +3NT - 8-11 points, flat hand + +* Response to pre-emptive 3 +pass - <15 points, no support +4[suit] - 3+support +new suit (forcing) / game[suit] - 16+ points + +** Rebidding ** + +* Rebidding after 1-level opening * + +Minimum rebid own suit - 5+cards, 12-15 points +jump rebid own suit - 6+ cards, 15-19 points, very invitational + +new suit < old suit - 12-15 points (old suit >= length new suit) +new suit > old suit [a reverse] - 16-19 points, 1-round force + [first suit bid should be best suit when reversing] +jump new suit - 16-19 points, 1-round force + +raise responder - 4+cards 12-15 points +single jump raise - 4+cards 16-18 points +game jump raise - 4+ cards 19 points + +* NT rebids to show a balanced hand of 15-19 points * + +[you opened 1[suit], and partner has replied at the 1-level] +1NT - 15-17 balanced (limit) +2NT - 18-19 balanced (limit) + +[you opened 1[suit], and partner has replied at the 2-level] +2NT - 15-17 balanced (limit) +3NT - 18-19 balanced (limit) + +** Later bids ** + +* 4th suit forcing * + +The bid of the fourth suit at 2-level is forcing for one +round. Responder uses it where they lack a natural bid, but think the +partnership should go higher. It forces for one round, and opener bids +(in preference order): +raise responder's first suit with 3+support +NT with a stop in the fourth suit +raise the 4th suit with 4 cards in it +make the most natural rebid + +* After the transfer * +e.g. after 1NT-1D-1H: + +pass - weak hand +2NT - invitational to part-score or game in H or NT +3H - promises 6 hearts, invitational to game +new suit - promises 5-4 or 5-5, game-forcing +3NT - option to move to 4H or stay in 3NT +4H - promises 6 hearts, to play + +* After a 1NT-2S transfer * + +opener bids 2NT if minimum: +pass or bid a minor suit + +opener bids 3C if maximum: +pass, bid 3D, or 3NT + +** Slamming :-) ** + +*Roman Key Card Blackwood* + +4NT once a suit has been agreed asks for the 5 key cards (trump K + +aces): +5C: 0/3 key cards +5D: 1/4 key cards +5H: 2/5 key cards no trump Q +5S: 2/5 key cards with trump Q + +*Cue bids* + +These are a bit advanced, so we might not want to bother, but. Once a +suit has been agreed explicitly or implicitly (e.g. 1NT-3S) and you're +thinking about slam, bid of a side-suit shows first-round control of +that suit, which might be a void. A return by either partner to the +trump suit is often an end to the process + +e.g. 1NT-3S-4D shows the first bidder to have 1st-round control in +Diamonds (and no such control in clubs); you can continue on to +2nd-round controls if you like. + +** Overcalls ** + +Against a 1-level bid, 1NT shows 16-18 points and a stop in the bid +suit (you may bid stayman on top if relevant), unless in fourth place +where it is 12-14 as normal e.g. 1H-p-p-1NT. +With more points, double, then bid NT next time. -Balanced hands (no void/singleton, <=1 doubleton): -12-14: 1NT -15-17: 1 of a suit, rebid 1NT -18-19: 1 of a suit, rebit 2NT -20-22: 2NT -23-24: 2Club, then rebit 2NT +1[suit] overcall is 5+cards, 8-16ish points +2[suit] overcall is 6+cards, 12-15ish points +a game overcall in a major with 6+cards 17+ points can be worth a shot -Unbalanced hands: -6-9, 7-card suit, poor defensive values: pre-emptive 3 (8-card suit: 4) -12-19 1 of longest suit [rule of 20: open if hcps and length of 2 longest suits>=20] -16-22, 8 playing tricks, 6-card suit or at least 5-4 two-suiter: 2D,H,S, -23+ 2Club (forcing to game) +** Doubles ** +Takeout double needs about 13 points, shortage in the opponents suit. +Double then bid suggests more like 17+ points +Double then jump suggests a killer 21+ point hand +A takeout double is forcing unless you are very strong in the bid +suit: +pass [!!] 8+ points, good in trumps, requesting trump lead +suit - your best suit +jump-suit - 8+ points +1NT - 8-11, stop in bid suit +2NT - 12-13, stop in bid suit +3NT - 14+, stop in bid suit +A low-level double when the doubler's partner has passed is nearly +always a takeout. +"A double of a suit call below the four level is for takeout when made +at the player's first opportunity of doubling, providing that the +doubler's partner has not bid" +NT doubles are always penalty +doubles of suit escapes from doubled NT are always penalty +doubles of openings up to 3[suit] are usually takeouts +doubles of overcalls up to 2S are usually takeouts -- 2.30.2