DavidKok, on 2022-October-08, 11:08, said:
Any bid showing 6 also shows at least 5.
System designers may disagree! Besides, if this is the sense in which the system regulators have used the verb 'show', can't it be proven that a classical Weak 2
♠ is both legal and illegal?
AL78, on 2022-October-08, 10:46, said:
Taken from the EBU blue book new edition 1st September 2022:
Level 4:
7C: Opening bids from 2
♣ to 3
♠ inclusive
Suit opening bids
These may be played as one or more meanings within (a), or (b), or ©. Alternatively any number of meanings of (a) may be combined with a single meaning from (b) or ©.
(a) Any Strong hand (see 5D1(b) above)
(b) Natural, defined as either of the following in the suit opened:
(i) 5+ cards, or
(ii) 4+ cards if a second suit is also specified
© Non-natural, defined as either:
(i) Any hand that shows 5+ cards in at least one suit, specified or not, but which must not show 4+ cards in the suit opened, or
(ii) Any hand that shows at least 4-4 in two specified suits, neither of which is the suit
opened, or
(iii) A 3-suited hand (5440, 4441 or 5431) with any specified shortage
https://www.ebu.co.u...k/blue-book.pdf Page 23-24
Since it shows 6 spades, it also shows 5+ spades. Then, since spades is the suit opened and the opening is not of type (a), it must be of type (b) (i) and therefore legal.
Since it shows 6 spades, it also shows 4+ spades. Then, since spades is the suit opened but the opening is not of type (a), (b) (ii) or © (iii), it must be illegal.
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What am I missing?