NORTH J954 K87 KT93 82 862 QT93 Q87 T54 A3 J64 642 AKJ76   KQT7 A52 AJ5 Q93

Dealer: North    Vul: None   MP Scoring West Pass Pass Pass North Pass 2 4 East 1 Pass Pass South 1 2N Pass

Rotated to South declarer: originally board: 8

Most would try 1N over the East 1 opening.
South's philosophy was that at matchpoint scoring, getting in lead directing overcalls and suggesting early a suit in which to compete was somehow preferable to a standard show of 15 to 17 balanced...real balanced...as balanced as they come.

North might have been surprised by the 2N bid, depending on the range of 1.
It was a makeshift partnership of necessity.

Two top clubs started the defence. A third round was won in hand and a heart from dummy discarded.
It looked as if success would boil down to which defender, East or West, would have the Q.
Declarer started trumps, East winning the A and exiting another.
Declarer cleared trumps ending in hand.
Cashed were the AK and a heart was ruffed.
East had followed to two spades, three hearts and at least three clubs.
East had to have had longer clubs than diamonds for the club opener, hence at least four and perhaps five.
If having five clubs, then West could not have the J, already all three having been exposed in play. East then of high cards had shown AJAKJ amounting to 13 points. East had to have at least two diamonds and perhaps three.
A theoretical East balanced hand including additionally the Q would have amounted to 15. If additionally the Q had been held, East would have had 17.
In either event, East would have strongly tended towards opening 1N. Some players with 17 points and a five card suit will tend towards a planned rebid of 2N.
What were those clubs spots by deduction for East?" wondered East. Good enough for such a upgrade?
"Excuse me...can you tell me your partner's tendencies for rebidding 2N in 5 card minor openings?"
"Uh...right...sure...um...tendencies."

"Unlikely then" concluded declarer aloud, the evidence pointing towards West strongly.