B1: 低花开叫 - folksbridge21/system2 GitHub Wiki

One Minor Open

1c-1s 2nt 3c; pass or correct, responder also can pass 2nt

逆叫我们用ingerbman convention to show weak hand
1C-1H-2D-2NT: relay to 3c，开叫方好牌可以拒绝Relay

  • Walsh 1 Diamond

弱牌，5张方片4张高花，skip 1D应叫。

1c-2c, 1D-2D, 逼叫一轮，好的10点以上
pass hand, inverter minor still on, forcing one rd, not gf, so 1c-2c, 1d-2d, dont need to play criss cross raise for invit

  • we play 🤞Criss Cross Raise for minor open

1D 3C: D 4+, 7-9 invit raise for D
1C 2D: C 5+, 7-9, invit raise for club

  • Response Over Opp's takeout double

  • 对应叫人的高花应叫三张支持，开叫人拿5-4-3-1不能自然的表示另外四张套时可以加叫应叫人的高花： 1m 1H/1S 2H/2S
    应叫人如果拿10点邀叫实力的牌，可以启动2NT问叫 （应叫人高花通常只有4张），答叫如下：

1c-1M-2M-2NT: 记忆要点： 33433
3C = 3 card, Minimum (11 to bad 13), shortness in the lower unbid suit
3D = 3 card, Minimum, shortness in the higher unbid suit
3M = 4 card, Minimum
3OM = 3 card, Maximum, shortness in the lower unbid suit
3N = 3 card, Maximum, shortness in the higher unbid suit
4M = 4 card, Maximum (good 13p+ and 14p+, can count shape)

  • 1D-1M-3C: artificial GF， 16p+， 通常19P+， 6-4套可以16p+
  • 1m-1H-1S, 开叫人有4张黑桃，在应叫人叫1H后，要描述，可以是均型

1C-1D-1NT, 开叫人有可能有高花。

  • 1m-1M-4m, 开叫人六张低花4张对搭档的高花应叫支持

1c-1S-4c, 6张梅花4张黑桃
1d-1h-4d: 6张方片4张红心

  • 1C-1D-1H/1S-4D: 应叫人在开叫人再叫高花后跳叫4阶方片，表示6张方片4张开叫人再叫高花，轻微满贯兴趣

  • Minorwood

  • 开叫人再叫低花套后续的叫牌： 1D-1H/1S-2D-? 应叫人的再叫：

  • 1D-1S-2D-2H: artificial forcing bid, may not have 4 hearts, need to alert, invit or better
  • 1D-1H-2D-2S: artificial forcing bid, may not have 4 spades, need to alert, invit or better
  • 1C-1S-2C-2D, forcing, artificial bid; 1C-1S-2C-2H, 5-4 majors , gf (bcs we play rev flannery for other 5-4+ Majors hand)
  • 1C/1D-1M-2C/2D-2nt, invit natural
  • 1C/1D-1H-2C/2D-2S, responder reverse, gf.
  • 1D-1H-2D-3C: invit+, natural.

开叫人的再叫：1D-1S-2D-2H: opener rebid 2s/2nt/3c/3d, all natural, invit, not forcing ; rebid 3H/3S, forcing, 3nt to play
******** this is from sun sao lin's advice_20210706 wechat

  • Criss Cross and Inverted Minor.
    Criss Cross: 5+ support, 7-9 point, mixed raise
    Inverted Minor: 4+ support, 10+, limited raise

1C/1D been X'ed: 1D (X) 2D : 4 support, 7- points
1D (X) 3D : 5 support, 7- points
1D (X) 3C : 5 support, 7-9 points - mixed raise
1D (X) 2NT: Jordan, 10+, 4 support, limited raise

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