E/W Vulnerable North dealer.
At last night's club pairs the bidding had gone, after North's pass: 2D (multi) X XX P 2S 3D P 3S P 4C P 4D End. On being asked East explained during the bidding that the XX showed a strong hand. Because South thought there might be 3 losers he passed North's 4D bid. West actually had a very weak hand (and had made the correct bid) and North/South missed their optimum contract. Here's South's hand.
♥ A K 8
♦ A K Q 10 9
♣ Q 10 6 3
What ruling would you have given?