C
Score, four to three in favor of A and C. C assists.
First Trick.—B leads the ten of hearts, C plays the right, D the king, and A the seven.
Second Trick.—C leads the ace of clubs, D plays the ten, A the eight of clubs, and B the king.
Third Trick.—C leads the ace of spades, D plays the king, A ruffs with the nine of hearts, and B plays the nine of spades.
Fourth and Fifth Tricks.—A leads the left, thereby drawing all the trumps, and continues with the winning club.
CASE IV.
Leading a trump up to the right.