Your partner opens one diamond in 1st seat. Right hand opponent passes. Plan your response and subsequent rebids holding this hand:
Remember that when you are 5-5 in the majors you respond one spade first, leaving you with an easy rebid of hearts at your next turn. But a pleasant surpise, partner raises your one spade response to two spades. Now what?
You have a spade fit and that five card heart suit headed by king-queen is great feature. One or two of those little hearts should be winners. I recommend you raise to four spades immediately. You should have a good play for game.