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As the dealer does not take the ten, the ace and jack are presumably in B’s hand. B’s play of ten denies the nine, which should be placed with the dealer.
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B plays ace to the first trick, and returns the king; this indicates no more cards in the suit, and marks the queen in the dealer’s hand.
LEADING UP TO DUMMY
With dummy on your right, you should invariably lead up to the weak suit. This is especially important when you hold no high cards in the suit, for in this case the strength lies between your partner and the dealer. By leading through the dealer’s hand you give your partner the advantage of position; otherwise he may be forced to lead up to the dealer’s strength.
In leading up to weakness, the general rule of leading the highest card of a sequence should be followed. It is often good play, when dummy holds no honour in the suit, to lead a card higher than dummy’s best. This permits your partner, if the lead is not covered, to pass the trick.
If dummy’s weakness is in the trump suit, your best play will often be to lead trumps through the dealer’s strong hand, rather than to lead up to the high cards in dummy. If you hold a guarded king and dummy a guarded queen, do not be tempted to lead up to this honour.
It would be obviously wrong to lead up to a king if you hold the ace. You must wait until this suit is led by the adversary or your partner. Do not lead up to an ace in dummy if you hold the king. You are reasonably sure to make a trick with this card if you wait until the suit is led by the dealer or your partner. If you hold a sequence headed by the queen or jack, little or no objection can be raised to your leading up to an ace or king, and on each occasion the highest card of the sequence should be led.
Should you lead a low card up to dummy’s strong suit, your lead would indicate a singleton and a desire to “ruff.”