Missing support double among other errors

[ThorvaldAagaard]

0F2F10E6EFF79C58C5A201FB1D5C

Playing support double North should double 1S to show 3-card support.

Without the double 3D is NOT forcing, and the correct bid is 2H responders reverse and GF

With the double the correct bid in south is still 2H.

North would then respond 2N/3N

As the double is not clearly defined this could happen https://shorter.me/x_L-S

Even after the NF (Invitational) 3D North mess up, trying to show support instead of bidding the natural 3N. Even if it was forcing 3N would still be the right bid.

[EdwardPiwowar]

No support double here - responder must show a major. Next BBA

[ThorvaldAagaard]

D from North must show 3D, when playing support doubles (Defined by GIB). Without support doubles it can show 4H. After overcall 1H, North can by 1S to show 4, and double is support double if on, or else it is a hand with extra, but without 4S

[EdwardPiwowar]

Everything is clear, but in BBA I don't have double support for diamonds.

[ThorvaldAagaard]

Then please add.

According to Larry Cohen not using it after 1D response is an exception https://www.larryco.com/bridge-articles/support-doubles

[EdwardPiwowar]

Later, you have to split the convention into two and change a lot in the implementation.

[ThorvaldAagaard]

Yes, I understand, but you have to get the defaults right before adding exceptions. Here you added the exception as default (or did not implement the full convention).

I would be nice if we could invent a way to add exceptions for any conventions, but that is not simple.