Example
| West | North | East | South |
|---|---|---|---|
| 1♦ | 1♠ | ? |
For example, if South holds: ♠ 86 ♥ KJ10852 ♦ K6 ♣ 532, partner opens 1♦ and East overcalls 1♠, he couldn't bid 2♥ in standard methods, as it would show 10+ high-card points, and a negative double would be too off-shape. With NFB treatment in effect though, he can bid 2♥ which the partner may pass (unless he has extra values and support, or an excellent suit of its own without tolerance for hearts).
However, as a corollary, negative free bids affect the scope of negative double; if the hand is suitable for "standard" forcing free bid (10-11+ points), a negative double has to be made first and the suit bid only in the next round. Thus, the negative double can be made with the following types of hand:
- A weakish hand with unbid suits (unbid major)
- A stronger hand with unbid suits
- A strong (opening bid or more) one-suited hand.
This can sometimes allow the opponents to preempt effectively.
| West | North | East | South |
|---|---|---|---|
| 1♦ | 1♥ | Dbl | 4♥ |
| ? |
For example, West, holding: ♠ KJ103 ♥ J8 ♦ AKQ104 ♣ J2, after this auction is in an awkward situation — he doesn't know whether partner has spades or not; whether South was bidding to make or to sacrifice — is it correct to double, bid 4♠ or pass?
Read more about this topic: Negative Free Bid
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