Raising Responder's suit

Dealer is W None Vulnerable

West *
♠ A J 10 9
♥ K Q 6
♦ Q J 7 4
♣ 6 5

East
♠ Q 8 7 5
♥ J 9
♦ A 9 8 2
♣ 9 7 3

W	N	E	S
1♦	-	1♠*
2♠#	-	Pass	-

* = Responder must not raise Opener's minor suit !
# = 4-card trump support and 12-15 pts