Brozel

A competitive defence of the 1NT opening. A double is used to show a one-suited hand. If partner does not wish to defend, he removes the double to 2C, then doubler can pass (with clubs) or bid his real suit. The overcalls of 1NT are:

2C shows clubs and hearts
2D shows diamonds and hearts
2H shows hearts and spades
2S shows spades and a minor suit (partner uses 2NT to ask for it)
2NT shows clubs and diamonds
3C, 3D, 3H, 3S shows a three suiter with a singleton or void in the suit bid.