D.O.N.T.
- Double = A relay to 2
to show a one suited hand - 2 = and any higher suit should be at least 5-4 (4-4 all points in your suits)
- 2
= and any higher suit - 2
= and 
- 2 = Doubling and then bidding spades is stronger than a direct 2 bid.
After the double responder bids 2 to let the doubler show his suit.
The doubler can pass ( if his suit is ) or bid 2 ,2 or 2.
If the doubler holds a strong hand with game interest he can jump to 3 of his suit
Responder is not forced to take the 2 relay if he has his own suit
being 6 or a very good 5 card suit especially if he is afraid of one of the unbid suits.
After the overcaller shows his suit , 2NT by responder shows a good game invitation
while a single raise shows a fit.The double of 1NT should never be left in because
doubler can have very few HCP.
AFTER THE 2/2/2 OVERCALL, Responder can pass with 3 card support or he can ask for overcallers other suit by
bidding the next suit up. If responder skips the next suit to bid another suit he is
showing his own 6 card suit or good 5 carder. A 2NT bid by responder is rare but
it shows a strong hand and asks partner to name his other suit at the 3 level.
If responder asks for the second suit by bidding next suit and then bids
2NT that is also a strong game invitation.
OVER OPPONENTS INTERFERENCE. If the opponents bid directly over the D.O.N.T bid , responder never guesses what suit his parter has.The only way to get responder to name his suits is to double or redouble. When the D.O.N.T. bid is doubled responder passes with 3 card support or redoubles to tell partner to bid his other suit.