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Here was board 14:
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A top board went to the players defending 3♣X.
South made an adventurous pass of 3♣X despite having, likely, a fit. But it was matchpoints.
South led his doubleton spade to the king. North continued with the ace after some thought, and another spade. Declarer ruffed with the 6, south discarding a heart, and played a club to the queen, south ducking. Another club went to the ten and ace as north discarded a heart. South then led a heart to the ace. A heart came back. Winning the king in dummy, declarer was trapped.
If declarer ran the ♦T, south would win the jack and stuff declarer back in with a heart (or a trump) to endplay him in diamonds. Therefore east ruffed a spade, drew trumps, and led a low diamond hoping south would play an honor to ensure winning the trick.
Unfortunately, south played low and north's queen won the trick, followed by two more red-suited tricks. +500 for N/S.
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There is no reasonable explanation for N/S either taking 12 tricks in a NT game or making 2NT doubled exactly, so nobody got +490. The only way anyone could possibly get 490 is to get to 2NTX through some strange bidding sequence, win the club lead, and return a club. East takes his 5 clubs. On the first four north discards 3 hearts and a diamond and south discards a spade.
On the last one, south discards a heart and west is squeezed. If west discards a spade, north discards a heart and 4 spades can be taken as well as the three obvious red-suited tricks. If a heart is discarded, north discards a spade and 3 hearts can be taken along with two spades and two diamonds. If west throws a diamond instead, north plays a spade on the last club, and say west returns a spade. North wins the ace and plays the queen of diamonds, covered by the king and ace. The J7 of diamonds are now cashed and west is squeezed in the majors.
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The next highest score went to an expert pair that managed 12 tricks in a heart game.
Some players in the east seat opened 3♣, which was usually followed by a takeout double from north and a leap to 4♥ from south, or overcalled 3♣ over 1♥.
The opening spade lead went to the king and the ♦Q was covered by the king and ace. Next came the ace of clubs, club ruff, ace of spades, spade ruff, club ruff, spade ruff.
With 5 cards left, this was the end position:
A club was led and west had to discard a diamond. Declarer ruffed in hand and played a diamond to the jack and another, endplaying west. +480.
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A scientific pair had a misunderstanding at another table.
1NT was 10-12. N/S agreed to play that a 2♠ bid in response to 1NT showed hearts, secondary spades, and an invitational hand, but south forgot. West doubled to extract the maximum penalty.
East led a trump and declarer won the ace. After ruffing a club, he then finessed the diamond to lead another club. West ruffed with the 8 and declarer discarded a heart. The ♠Q was returned to the king. The ace of diamonds was followed by the ♥Q, west covering with the king and declarer winning with the ace. North exited a heart to east.
After taking his heart and the ♦K, east had to lead the ♣K, promoting the 7 of spades. After taking his 7, declarer led another heart, letting east ruff, and east won the last trick with the ♦T while the other players played the ♥9, ♣T, and ♥T. +470.
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3♦ was a game try and south bid 3NT because it was matchpoints. West led the ♣Q
South ducked the first two club leads and won the third, throwing spades from dummy, before slyly running the ♥Q, which held. Five hearts and the ace of spades were taken, leading to this position.
On the king of spades east had to throw a diamond. South discarded his club and finessed the diamond, dropping the king on the next round. +460.
If west had covered the ♥Q south would duck in dummy before winning any return and applying the same squeeze on east.
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One pair had a normal result of 4 hearts making 5 when declarer mis-guessed trumps and lost a trump and a diamond. +450.
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This is the only hand I have found where either opponent can be endplayed or squeezed legitimately depending on the strain and/or the play to the first trick. And all the scores are so close!