Open 1S with 6 spades and 6 hearts. Partner bids 2C and you rebid 2H. Partner jumps to 4D showing a better than average hand (13+ points), you rebid your hearts (showing 5 hearts, and therefore your spades must be longer) partner prefers hearts (but they shouldn't as their spades are longer). All Pass
Acol Bidding
Open 1S with 6 spades and 6 hearts. Partner bids 2C and you rebid 2H. Partner jumps to 4D showing a better than average hand (13+ points), you rebid your hearts (showing 5 hearts, and therefore your spades must be longer) partner prefers hearts (but they shouldn't as their spades are longer). All Pass
Plan Before You Play
Dummy goes down in a suit contract count you losing tricks. Spades:0, Hearts:1, Diamonds:0, Clubs:1. You can make this contract, so draw trumps and run your spades seems to be the best approach.
The Play
Diamond lead, cover with KD hopeful that west has underlead the AD, (so you can discard the losing 10C on KD), no east has AD, so plan to enter dummy with AH and then discard 10C on QD. Play AH, QD, QS and then 2S to AS. Two rounds of trumps draws them all out, ruff the JD return and run your winning spade tricks
Comment
This contract makes 12 tricks in hearts and 12 tricks in spades if you can find the spade contract with a diamond lead. An AC lead means you only get 11 tricks in heart contract.
The above commentary is intended as a guideline only. As with any Bridge hand there are many ways to bid and play any hand.