Dbl: Undefined onesuiter. Shows some strength since
partner can pass.
2C : Clubs + another suit.
2D : Diamonds + a majorsuit.
2H : Hearts + Spades.
2S : Spadesuit. Has not enough strength to double.
Woodgroves Commentaries. I don't like this system, but if my partner sticks a gun to my head, I play it with this changes:
2C : Clubs + a majorsuit (4 card suit).
2D : Diamonds + majorfarge (4 card suit).
2NT: Both minor.
Since it often is better to play 5-2 in a major suit instead of 4-3 with a minor suit, should the minor suit be at least 5 card. With a good 5 card major suit, you should double if you have some strength, even if you have a 4/5 card minorsuit.