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.

50 CORRECT CONTRACT BRIDGE
when you shift partner's minor make requiring
eleven tricks for game, to a major suit declaration
needing one fewer trick), or when you shift to a
make at which the joint 26 cards of your side can
win more tricks.
Although you hold normal aid for either minor
suit declaration, the next hand obligates an attempt
to improve partner's i-Club or i-Diamond by shifting to i-Spade.
* AKI052 64 4 i063 J97
The following cards require you to bid 2-Diamonds over partner's i-Heart.
* 7543 84 4 75 0 AQJ72
Avoid the appearance of a selfish desire to become the declarer but give your partner all possible
information which may tend to the discovery of the
best final declaration. Even with normal aid for
partner's i-Club declaration you may properly bid
i-Diamond on
4 6 4 3 v 75 * K Io 4 O AKio64
Your partner's low bid and your own single assist
offer almost no hope of game at clubs, but your display of diamond strength may possibly enable partner to safely bid no trump, because he knows that
you hold guards in his very weak suit. If your
partner opens with I Heart and you hold the hand
shown below, your proper course is to aid his decla