With only us vulnerable at matchpoints, partner (South) dealt and bid one diamond. If West had passed, I would have bid one spade (one over one) with ♠ JT83 ♡ Q943 ♢J87 ♣ Q2. For this, I have minimum values.
But West overcalled with one heart. I (North) still bid one spade, which partner took, perhaps reasonably, for my having five spades. (See last paragraph.)
An alternative bid to show four spades might be a negative double. But my understanding is that this bid means "I don't like your suit and I don't want to defend the opponents' suit; i.e. I would prefer to play in one of the black suits, not red." But that's not the case, because I don't mind defending hearts or being dummy in diamonds. Also, I'm not sure that that my six high card points are adequate for a negative double, so I don't like this bid.
Should I have made a negative double despite my misgivings? Or was there a better call, perhaps "pass," since I don't mind defending a heart contract?
East bid two hearts, partner raised to two spades, West bid three hearts, and partner competed to three spades with minimum value: ♠ Q52 ♡ T ♢AQT94 ♣ AT93. We went down two and got a bottom. We would have gotten an average score by letting the opponents play three hearts, and a top score if our opponents had been kind enough to let us play in two spades (down one). Did my one spade bid wrongly encourage partner to go to three spades?