Moysian Fit
A Moysian Fit is a 4-3 trump fit. The Play of the hand with a Moysian Fit quite frequently requires particular care in maintaining control of the trump suit, as they most frequently divide 4-2:
J54
AT2
K73
K862
AKQ73
T98
9763
54
T8
9654
93
JT75
62
KQJ8
AQJ2
AQ4
South gets to an excellent 4
contract as both 3NT, 5
and 5
don't make. West starts with 3 top spades and South must discard on the third spade. If South ruffs he will lose control of the trump suit and go 1 down.
Compiled by Lorne Russell 2005