The weak notrump is a preemptive bid intended to gobble up the opponents' constructive bidding space. One problem of the weak notrump, however is that 4-4 major-suit fits are frequently missed, when playing in a major is much better than playing in notrumps. Also, because the weak notrump is subject to penalty doubles by the opposition, an escape system is a necessary adjunct:
If integrating the weak notrump into your system, it is also important to consider its effect on natural sequences such as
1NT here normally shows around 12-14 HCP, but playing a weak notrump should show 15-17.
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