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but also:
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It seems to me that if we play, say, weak notrump, Walsh, strong 2 openings, negative freebids, 4-card majors etc. and those agreements are considered nonstandard in the local environment, we should not alert according to 1 (they are natural treatments), but we should according to 2 (they are based on special understanding between us).
So: alert or not? Does it depend on how unusual they are? Does it depend how significantly they deviate from standard (Walsh may be a minor deviation while strong 2 openings may be a major deviation)? Because if not, I would interpret 2 as an obligation to alert everything except in completely undiscussed situations.
Is there a gray zone where opps may expect us to alert, while we can never be punished for not doing so?

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