Listen, Weigh, Jackpot

Listen, Weigh, Jackpot
Nadeshiko explaining the game
Gamble name
Japanese	聴重千金
Translation	Choujuu senkin
Information
Chapters	35 - 38 62 - 63
Game
Players	Mary Saotome vs Nadeshiko Rurichou Nadeshiko Rurichou vs Shougou Soga Nadeshiko Rurichou vs Mikoto Gouto
Stakes	100000 yen (initially) 300000 yen 1 million yen

Listen, Weigh, Jackpot is the Classical music research club's gamble that they presented during the cultural festival. Nadeshiko Rurichou played against Mary Saotome. Kurumi Kurume watched them during the gamble. Later, Nadeshiko plays this game against Shougou Soga and Mikoto Gouto.

Rules

There are a total of 600 small coins at their disposal: 300 1 yen coins and 300 50 yen coins. A 1 yen coin weighs 1g, and a 50 yen coin weighs 4g. Each player also gets a "savings box". They then can put as many coins as they want in their own box. Both players then place the boxes on the scale and must guess how many coins of each weight there are in the other's box. Each player knows their own box's weight and can try to determine it by the difference.

If you guess incorrectly, you have to pay your bet. However, if you are right, you win five times what was originally bet.

Game

Mary vs Nadeshiko

Nadeshiko claims to have amazing ears, being a skilled pianist. She tells Mary that the moment when the players put the coins inside their saving box is the most important, as she uses sound to determine the number of coins. Mary remains unconvinced and is victorious during the first rounds. She wants to leave but Nadeshiko provokes her, insinuating that Mary is a commoner. Furious, the girl agreed to play again.

This time they bet 1 million yen. Nadeshiko declares a value of 17 and as she is correct she wins five million yen from Mary, who is shocked. She quickly goes to the bathroom, leaving Kurumi and Nadeshiko alone for a couple of minutes. When Mary is back, she challenges Nadeshiko to a different gamble - if she's able to perfectly balance the number of coins Mary inserts, she'll give her 1 million yen. Nadeshiko gleefully accepts.

Mary tells Kurumi about the weight of the coins

When they open up their savings boxes, Nadeshiko is shocked to see that Mary only has 9 coins. She expected to see 13 instead. But Mary figured out her cheating method: the box containing the coins is actually a scale itself and Nadeshiko's wristwatch displays the current weight. Since 600 coins weigh 1500g, she is able to guess the number of coins chosen by her opponent based on how many coins are currently missing from the box. Mary did take 13 coins, but she only put 9 inside her box; moreover, she attached a 500-yen coin to the lid with duct tape (that she obtained when she left for the bathroom), tricking Nadeshiko into believing that she used more coins.

She also had another plan in case Nadeshiko's hearing had indeed been prodigious: she had tied a coin to a thread so that when she put it in the box (creating a sound), she could also retrieve it. Nadeshiko was simply cheating, and that trick was superfluous, but Mary tells her she would have lost anyway.

Nadeshiko is still claiming that Mary guessed wrong, as only 21 coins were inside the boxes. However, Mary reveals that another 50-yen coin was stuck to the bottom of Nadeshiko's box. Because old 50-yen coins were made of nickel, she used a magnet to hide a coin during difficult situations. It would have been easy for her to remove it from the bottom by shaking the box harder, so it was an ingenious trick. Nadeshiko is sad and tries to bargain, but Mary orders her to pay the 2900000 yen she won.

Nadeshiko vs Shougou

Nadeshiko believes her game has the perfect cheat and is convinced she'll win. She purposefully throws the first game, guessing that there are 42 coins. Shougou wins it by accurately guessing that there are 36 coins. He receives one million yen for this victory.

Nadeshiko vs Mikoto

Nadeshiko challenges the middle schoolers Mikoto and Shougou to a rematch immediately after her loss. Mikoto plays instead of Shougou this time. Players agree on the stakes being 1.5 million yen. The maximum amount possible to be earned with this single game is thus 9 million yen. While Nadeshiko is grabbing coins, Mikoto takes her arm and calls Kaede to check her for cheating. Kaede judges that Nadeshiko's watch consists of cheating. He decides that she owes Mikoto 9 million, the maximum amount she could have won from this gamble. Not being able to afford that, Nadeshiko risks becoming a housepet.