Matchpoints, club game.
Your hand is worth a game force. You would like to play in a major suit contract if you have a fit, or 3NT if you don't.
If you bid 2♥ here, in some systems that is not a forcing bid. There is a convention that can help with this.
The New Minor Forcing bid creates a one-round force and shows invitational values or better. On this hand you would bid 2♣.
The opening bidder bids 2 of the responder's major if he has three card support, 4 of the other major if he has four of those and not three of your major, or 2NT if he has neither of them.
You bid 2♣ and partner bids 2♠. Your partner has three spades. Do you bid game now?
Although your partner has three spades, it is possible that he also has four hearts.
Why is it desireable to play in a possible 4-4 heart fit instead of a 5-3 spade fit? The reason is that if you play a 4-4 heart fit and draw trumps, the spade suit will provide discards, but if you play in the 5-3 spade fit, the heart suit will not provide discards.
I think the right bid is 3♥ here. It is forcing.
So you bid 3♥ and partner raises to 4. The lead is the ♣J....
You win the ace.
Do you see how the 4-4 heart fit works? If hearts are 3-2, you can draw trumps and run spades, discarding your club loser and a diamond loser. You lose two diamonds and you make 5. If hearts are 4-1, you can draw all the trumps and run spades and you take four heart tricks, five spades, and the ♣A for the same 10 tricks as you have in a spade contract.
Trumps will split 3-2 a whopping 68% of the time. Trumps will split 4-1 28% of the time. The 5-0 split happens 4% of the time.
Here's how the play would go if trumps are 3-2....
So you play a heart....
Unfortunately, at the table, hearts were 5-0!
So, instead of a great board, we got a bottom board. But this is one bottom board that I was happy with.
When you find a good trump fit, try looking for a better one, if one is possible.
4-4 fits play well a lot of the time.
Plus... it's free!