Fourth Suit Forcing - 4
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Dealer is W     None Vulnerable
West *
♠ A K 7 6
♥ K Q 5 3
♦ 6

♣ A 5 4 2
Next
East
♠ 10 9 3 2
♥ A 8 7
♦ K Q J 10 7

♣ 8
 
W N E S
1♣ - 1♦ -
1♥ - 1♠* -
4♠ -    
       
 
* = natural, showing 4 Spades at the 1-level → not 4th suit forcing