After a 4♥ opening bid, is that a Takeout or a Penalty Double? - with Marla Lawson

Play this bridge hand for free: learnbridgeonline.com/lesson/...
After two passes, our right hand opponent opens with a whopping 4♥ bid! Oh boy, this is already exciting.
Partner then doubles... is that a takeout or a penalty double?
You must decide: What do you do?
Try playing through this hand both ways to see whether it's better declaring or defending this hand. What do you think it takes to pass partner's takeout double and turn it into a penalty double here?
♠♥♦♣♠♥♦♣♠♥♦♣
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[@aimeemorris9997]

And E/W is vulnerable!

[@gatheringwatersradiomeritb3182]

Apply the Rule of 9 and it implies it would be OK to leave the double in.

[@archie6945]

After N bids 4H and W is holding five of that suit, why think it's a penalty double?

[@user-mg3vj6qr8n]

Easier to defend and set the 4h contract. E has a sure H trick with 5 Hearts and another possible one with A of S. Assuming a take out double W has opening points and is likely to have several plus winning tricks. E can only count on 3 sure cards in unbid suits so has to guess length of S suit at the level of 4.

[@MrWrite1]

PASSED? You have 5 hearts. He isn't doubling for penalty.