Reopen
Responding to a Reopening Double
6
  A reopening double can show many different hand types and is difficult
  to respond to. Reopening doubles are a tremendously important part
  of competitive bidding and it is essential that the correct fit
  is found following one.
  This flowchart handles their responses.

7
1
Interference ?
0

1
Known fit ?
2
Do you have a known fit with partner?  Is there a suit in which your combined
length is at least eight? If you don't have a fit, just pass.

1
Known fit ?
2
Do you have a known fit with partner?  Is there a suit in which your combined
length is >= 8?

1
Bid your fit
4
Bid your eight-card fit as cheaply as possible.  If you have two fits, 
bid a major fit in preference to a minor fit.  If you have two major
fits, bid the cheapest major fit.  If you have two minor fits, bid
the longer fit (clubs if equal).

1
Convert to penalty?
3
Can you convert partner's reopening double for penalty?
To do so you must have length in the opponent's suit and also moderate
strength.

1
Longest fit
4
Try to find your best fit with partner.
Major suits are preferred, because partner's doubles are more likely to
show 4 card majors. You can also often bid the majors at a level lower
than the minors.

1
Pass
0

7
0 0 0 1 2 1 2
1 1 0 -1 -1 -1 -1
2 0 -1 3 4 1 2
3 1 -1 -1 -1 -1 -1
4 0 -2 5 6 1 2
6 1 -2 -1 -1 -1 -1
5 0 -3 -1 -1 -1 -1
0
