With East dealer the auction proceeded:
1♠-2♠(1)-X(2)-2NT(3)
3♠-X(4)- P - 3NT(5)
P - P - P
After two rounds of spades and a diamond switch, declarer cashes his top clubs, enters hand to cash his spade winner and takes the heart finesse for his contract. When it loses, the defence cash the rest and the final result is 3NT-4, N/S -200.
(1) ♥ and a minor, at least 5-5
(2) Interest in taking a penalty
(3) Asks for the minor
(4) Considerable extra strength, minor still unspecified
(5) Undiscussed
When asks why he did not double 3NT, West explains that:
(a) The 3♠ bid showed a minimum opening bid perhaps without a great deal of defence.
[b] He thought that the penalty from 3NT undoubled would be more than the penalty from 4♣x.
South contends that this particular East has as reputation for psyching and that he has made very light opening 1-level opening bids on a previous occasion against him a couple of years ago, playing with the same partner.
What is your ruling?

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