南 6S

W首攻：CQ

S T42
H AK873
D 864
C A5

S AKQ763
H Q
D AKQT9
C 7

1. CA
2. ruff C back
3. SA

if all follow not bad than 3-1, then cash QH, continue DAKQ, no matter when opps ruff and return, always can clean trump and back to dummy to cash HAK to make.

If west has 4S, cash QH, play small S to dummy, S10 always be an entry....

If east has 4S, cash QH, continue DAKQ until east ruff......