Defence over

Two suiter overcall

Over two suiter with both known suits

- Double is for penalty for one of the suits, all further doubles are for penalty with the exception of a double   over 2NT (bothm) which is for T/O.

- A raise of OP's suit is NF

- Cue bid of the lower suit shows support for OP's suit and is F1

- Cue bid of the higher suit shows 4^th suit and is F1

- The bid of the 4th suit is natural and NF

Over Michaels Cue bid - sequence 1M - (2M)

2♠/3♥ (cue)    =     invitational +

2NT    =     4 card support, 9+

3m    =     natural, F1

3M    =     NF