GOREN BRIDGE
Defensive bidding after an opponent opens one no-trump has been fertile ground for bidding theorists over the years. Many ideas have enjoyed popularity for some time before fading away. An idea that is currently popular is illustrated in today's deal. An overcall of two diamonds shows a major suit and could be either spades or hearts. To develop the auction further, partner can bid two hearts, two spades, three hearts, or three spades, all as "pass or correct", with the overcaller taking the appropriate action. A two no-trump response to the overcall is similar to a two no-trump response to a weak two bid. When partner wants to raise to game, he has two choices. He bids four clubs when he wants to be the declarer, asking the overcaller to transfer into his suit, bidding four diamonds with hearts or four hearts with spades. With no desire to be declarer, as here, he bids four diamonds asking the overcaller to bid his suit.
You are West and you have listened to all the explanations. What would you lead? A case can be made for any suit, but the logical lead is a trump. Why? Partner has 15-17 points and you have six. The opponents have bid game with a combined 17-19 points. The game has been bid on fit rather than power. You want to prevent as many ruffs as possible. An opening trump lead, followed by another trump when partner gains the lead, is the only way to defeat four hearts. Declarer will be limited to two club ruffs in dummy. They have the fancy auction, but you have the plus score!