After an opponent doubles a 4NT ace enquiry, Redouble shows zero (O) aces, Pass shows one (I) ace and the lowest bid (5♣) shows two aces etc. This method is in popular use in the UK.
Charity May 2026: Bernard, Helen & Alfie Magee and Cruise Specialist Gary are running the Inflatable 5K on 9th May 2026
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