Correct contract bridge / by E.V. Shepard ; including the official Laws of contract bridge adopted by the Whist Club, New York, and by all the leading clubs in America.

208 CORRECT CONTRACT BRIDGE
procedure might be employed to advantage whether
Y were to have A's cards or those held by B.
Suppose that A and Y were to exchange holdings: then Z's opening bid of 2-No Trumps would
be shifted by his partner to 3-Hearts; instead of
bidding 3-No Trumps with a single low card of
partner's suit, Z could shift to 3-Spades, without increasing the contract. Of course Z's partner would
bid 4-Spades, and a little slam would result.
Were the holdings of B and Y to be exchanged,
Z would again shift his partner's 3-Hearts to 3 -Spades; upon Z's signal that he held only a single
heart and four cards of each remaining suit, Z's
partner should shift to 4-Clubs (A 4-card suit
headed by a high honor), which Z would raise to
s-Clubs, possibly yielding a little slam.
If partners make highly intelligent use of the 2 -No Trump approach, this species of contracting will
ordinarily yield excellent results, without confusion
of ideas.