June 27, the day of the moon. It's not a day that should come out and play, but it's a day to come out and play - because that's what Conan demanded.

Yes, Conan took the initiative to apply for leave, and he also asked Chiba and Gray Yuan Ai to take leave as well - in the end, Motota Ayumi and Mitsuhiko also ignored the fact that there was still half a month to go before the exam.

When Chiba asked Conan why he did this, Conan didn't answer him about anything of value, but just said that he wanted to come out and relax.

———— on a JR limited express train. Dr. Asa sits in the car with all the members of the Junior Detective Corps.

"Why not Himeji Castle?" Motota asked. "If you're going to the castle tower, wouldn't it be better to go to the more famous Himeji Castle?"

"Egret Castle was declared the first World Heritage Site in Japan by UNESCO last year, and it must be crowded right now," Conan shrugged. "And the Matsumoto castle tower also has its own advantages, after all, it is the only composite connection castle tower."

At the same time, a quiet, more basic level of science popularization activities is being carried out in the seat next to him.

[The castle tower is a top-notch Japanese-style castle that appeared in the 16th century, and the currently recognized originator of the castle tower is probably the Azuchi castle tower built by Oda Nobunaga...... It was supposed to have been built in 1576. In the past, there were some castle towers and other analogues such as mountain castles or four-story turrets, but whether they belonged to the castle tower is still debatable. ] - Qianyu's text message

[Is the castle in your phrase a castle in the traditional European sense?] castle？ ] - Gray Plains' text message.

[It shouldn't be counted, because the difference between the definition of the castle tower and the castle is quite large.] The castle itself is a comprehensive building that integrates offensive and defensive capabilities, and serves as both a garrison and a fortress; In addition to defending the fortress, the castle tower is mainly positioned to store supplies in places such as the castle tower (if any) or to carry out reconnaissance duties like the castle tower's predecessor, the turret. In short, I think the castle tower itself is roughly equivalent to a standard castle like Salzburg Castle, and the castle tower itself is more like an inner fortress. —Thousand Feathers

[Including that kind of defense?] - Gray Plains Mourning

[It's hard to say about this, after all, the inner fortresses of Europe are all stones, and it's a pity that the castle tower is in this regard.] —Thousand Feathers

"By the way, how long will it take to arrive?" Motota asked. "I can't wait!"

"It's just a drive," Dr. Asa was a little confused. "Anyway, it will take three hours to get to Matsumoto City."

"Then let's play a game I've heard of," Mitsuhiko suggested. "It's a game that exercises your thinking skills!"

“？” Everyone looked at Mitsuhiko.

"One of us came up with a puzzle as the one who wrote the problem," Mitsuhiko said. "When other people ask questions in order, the questioner can only answer 'yes' or 'no' until someone finally solves the puzzle – and of course, that the puzzle doesn't go too far, in every sense of the word."

"If that's the case, it's really a very efficient way to broaden lateral thinking......," Conan said after a moment of deep thought. So, who will come first? ”

"I'll come first, and I'll just give you a demonstration, how about it?" Dr. Asasa suggested.

"Alright, then Doctor, you come first!" Mitsuhiko nodded. "But it can't be too difficult!"

"Okay, listen to the question!" Dr. Asa said with a smile. "I remember I just taught you how to play Texas Hold'em last Thursday, right?"

"Yes!" Ayumi nodded. "That dimension has been losing from beginning to end!"

"Ayumi, why do you always remember this kind of thing!" Yuan Tai pouted and said dissatisfied.

"Just remember how to play," Dr. Asa continued, smiling. "At a world-class Grand Prix final, there were two players playing Texas Hold'em, and player A had their last cards being K, Q, Q, Q, Q; And player B's last card is five cards that are not exactly consecutive cards and do not have aces. But in the end, it was player B who won the game, why? ”

"Huh?" Everyone was stunned at the same time.

The five cards of Q, Q, Q, Q, and K are four-of-a-kind in Texas Hold'em, and only a straight flush and the higher four of a kind can suppress this hand. However, it is impossible for B to make a straight flush without a king in A's hand, and there is no way to have a four of a kind that is bigger than A's without an ace in B's hand...... What's going on?

"Alright," Dr. Asasa seemed pleased with their bewildered expressions. "Let's start answering!"

"May I ask if this final is a best-of-three game that allows for a loss?" Ayumi asked first.

“No！” Dr. Asa didn't seem surprised by Ayumi's answer, but faintly dismissed her idea.

"Is this a game with a lower card than anyone?" Mitsuhiko asked.

“No！”

"Is there a shady scene in the game?" Motota asked.

“No！” With that, Dr. Asa looked at Conan. "What do you think?"

"Is there only one deck of cards in this game?" Conan thought for a moment and said tentatively.

[That's right!] If there is more than just one deck of cards, the cards in B's hand may be cards like KKKKQ! According to the rules, such four are a larger combination than QQQQK. But is it really possible to have multiple decks of cards? I've never heard of a "five-of-a-kind" in Texas Hold'em! 】

“No！” Dr. Asa shook his head with an unconcealable smile.

[Sure enough, this brain hole is not very reliable, so why? ] 】

"What do you think of Gray Plains?" Dr. Asa looked at Ashbara.

"Doctor, please repeat the question." Gray Yuan Wai just asked after thinking about it.

"Huh? Oh. Dr. Asa froze visibly before repeating the question.

"......" Gray Yuan Wai frowned slightly, and then quickly relaxed. Excuse me......"

"Is QQQQK in A's hand a four-of-a-kind hand in Texas Hold'em?"

"Huh?" Except for Dr. Asasa who raised his eyebrows and Ai Ashara, who waited for an answer, everyone's eyes widened - what kind of question was this? If even QQQQK is not a four-of-a-kind, then what is a four-of-a-kind?

However, Dr. Asasa gave them an even stranger answer.

“No！”

[QQQQA is not four? How can this be- wait a minute? 】

Qian Yu's look of surprise faded instantly, and he changed to a thoughtful expression, and after a while, he suddenly realized.

[I see! 】

"Excuse me," Chiba asked, looking at Dr. Asasa. "Is A's hand a pair of two pairs or a three-of-a-kind?"

Two pairs in Texas Hold'em refer to two of the same pair of cards and one single card in five cards, while three of a kind means to have three of a kind and two single cards, both of which are much smaller than the cards that B might possibly compose.

“Yes！” Dr. Asasa had a smile of approval on his face.

"Doctor, is it really good to play Q and 9's pronunciation memes?" Thousand Feathers pouted. "I also specially added a K in front of us to induce us, so that we thought it was all Q......"

(I should have said before that the Japanese Q is pronounced the same as 9, so A actually only drew a hand like QQ99K or QQQ9K, and it is very likely that there is no big B)