Uncontested

The source for this Dutch bidding system can be found at: http://www.bridge.nl/groepen/Bridgeblad/Bridge_biedermeijergroen.htm

Openingsbid

- - game forcing - - preempt preempt preempt

Answer

1X

- - 1 - 2 2 - 2 jump - 3 jump 3 - - 4 -

1SA Complex

- - Stayman - - - - Jacoby - . Jacoby - . - -

2K

manche forcing zwak . - A K Q - - A K Q

2X

- afwijsbod 2 - A K Q 3 - A K Q 3 slam interest - no slam interest - 4 no slam interest

2NT Complex

- - Stayman - - - - Jacoby - . Jacoby - . -

Preempts

preempt - - - preempt - - - preempt 4 -

Rebid

Rebid 1X

1X 1Y

- . 1 - 1 - - 2 - 2 - 2 reverse 2 - - 3 - 3 - 3 -

1X 1SA

- . - - 2 - 2 - 2 reverse - 3 - 3 - -

Contested

Overcall / double

- - 1 - - 1 - 2 jump

Answer to double

- - - . 1 - - 2 - 2 jump -