\"Wow, this courtyard is so big.\" Walking into the courtyard of the castle, Genta exclaimed as he looked around.

"Wow, it's a horse.\" Ayumi looked at the horse that was being processed from a stone pillar and ran over and shouted.

\"yes, and the black one.\" Motota followed.

"But why is there only a horse's head?" Mitsuhiko looked at and wondered.

"The horse is a knight, a chess piece.\" Xiao Ai explained to everyone.

\"Chess?\" is not beautiful and unknown so.

"It's not just the chess pieces, you look at the ground, and it's the chessboard in chess.\" Conan explained.

"Does anyone here like chess?" asked the doctor, looking into the garden.

\"I don't know, I just did it according to the instructions of the old man Mr. Shoaki.\" Katsuo Tabata replied.

"I just need to trim this place every day and keep it like this.\" Katsuo Tabata continued.

\"But I heard that this is the last words of the great lord who passed away fifteen years ago, and Mr. Shocho has always inherited it.\" Katsuo Tabata said as he inquired about it.

\"Before you said... Who was the one just now?\" The doctor asked, looking at the man not far away.

\"Oh, that's Madame's second husband, Mr. Mamiyamitsu.Because Mr. Shocho died of illness six years ago, and Madame also passed away in a fire four years ago.\" Katsuo Tabata replied to the doctor's question as he recalled.

\"The fire?\" the doctor asked, looking at Katsuo Tabata.

"Look, it's the stone tower, you see that there are traces of burning? Actually, it's Madame's bedroom.In order to celebrate the old lady's birthday, a fire broke out shortly after returning here.In the middle of the night, before dawn, it burned out.\There was not only Madame in it, but even the friends that Madame brought back and the dozen or so retinues who served the old lady all the year round also died in the fire.\" Katsuo Tabata explained to the doctor while pointing to the stone pagoda not far away.

\"In the end, only me, the gardener, was left, and the old lady who was resting in the annex because of a cold.\There was also Mr. Man, who arrived one step earlier than the lady, and Mr. Guiren, the only son born to Mr. Zhengqiu and Mrs. Zhengqiu.He also came back two or three days before the fire.\" Katsuo Tabata walked towards the castle with the doctor and the others, and introduced the man who was squatting on the edge of the chessboard to study the chess pieces.

\"The first time Mr. Tachito came back here to meet Mr. Man, it was at that time.Madame and Mr. Man have been living abroad since she remarried abroad.For some reason, Mr. Man has been living here since the fire.\" Katsuo Tabata said to the doctor.

\"But it must be hard for the two of them to move in, or no one knows them at all.\" The doctor said with his hands behind his back.

"That's not going to happen, Madame sent me a photo back at the remarriage ceremony, so everyone has seen Mr. Man's appearance, and as for Mr. Nobleman, you see, he looks exactly like the dead man.\" Katsuo Tabata explained to the doctor, and when he came to the gate of the castle, he pointed to the portrait hanging inside.

\"If you look at it this way, anyone will think that they are father and son.\" The doctor looked at the painting, and then compared his head with the noble gentleman outside, and got this result.

"What about the portraits on the left and right?" The doctor asked, looking left and right.

"It's Mr. and Mrs. Zhengqiu, and Mr. Zhengqiu has great respect for the great master who is a historian, and for this reason, Mrs. often quarrels with Mr. Zhengqiu.\" Katsuo Tabata explained for the doctor.

\"The old man is just a man who talks big but doesn't act, right?\" From behind the doctor came the voice of an old man.

\"Hmm...\" Xiaobai looked at the old man in the wheelchair who was covered with wrinkles and age spots, as if he felt that something was wrong.

"Even if this castle is without him, I'm used to it.Just like the size of banknotes and passports has changed, I may have to get used to it at first, but after a long time, I take it for granted... Time is really... It's terrible.Because joy and sadness can be erased in an instant.\" When Katsuo Tabata mentioned the deceased old man, the old man said with a general reminiscence.

\"Time...\" Listening to the old man's words as if talking to himself, the arc of Xiaobai's smile slowly became smaller.

"Mystery?\" During the time of Xiaobai's distraction, it seemed that something was being said, and the doctor was asking something.

\"I heard that it was the last words of the great lord before he died, and whoever solves the mystery of this castle will be able to get my favorite treasure.\" Katsuo Tabata explained to the doctor and the others.

\"Oh... It seems to be a little interesting.\" Putting aside those thinking questions, the arc on Xiaobai's face slowly rose.

"By the way, isn't my daughter here yet? didn't she say she would come back today to celebrate my birthday.\" said the old man as he controlled his wheelchair.

"Old lady.\" Katsuo Tabata shouted at the old man.

\"It's really exciting to let her go to my room as soon as she comes.\" The old man said without looking back, and then controlled the wheelchair to leave.

\"It's been like that since the fire.\" Katsuo Tabata said as he looked at the old lady who had left.

"I think she must be overly sad.\" The doctor seemed to feel deeply.

\"Uncle, may I ask if there is a room here where you can see the chess games in the courtyard?\" Conan asked Katsuo Tabata at him.

\"Those chess games in the courtyard, this one, you can come with me.\" Katsuo Tabata nodded, and then led everyone towards the second floor.

…

"It's amazing.The chess pieces are all in order.\" Ayumi exclaimed as she looked at the chess below.

"I can't even see it?" Motota screamed as she pushed and pushed forward.

"Yuantai, you can also see it in the room next to you.\" Xiaobai said to Yuantai.

"Huh, how do you know?\" Yuan Tai looked at Xiaobai suspiciously.

"You can see the room from here.\" Then, I heard the sound of the window opening next to me, and Mitsuhiko's voice came with it.

\"Then I'm over.\" seemed to forget what he had just asked, and Motota ran briskly towards the next room.

\"Did you look at your surroundings when you came in?\" As Conan and Ayumi were looking at the chess below, Xiao Ai asked softly to Xiaobai, who was leaning against the wall.

\"Hmm.\" Xiaobai nodded with a familiar smile.

\"Did you find something?\" Xiao Ai asked softly.

"Let's take a look at the clues provided by Conan first.\" Xiaobai did not answer Xiao Ai's question directly, but looked at Conan who was sitting cross-legged next to him.

\"That's an arrangement...\" Xiaobai thought as he looked at Conan's diagram drawn according to the chess arrangement below.

\"It's going to fall.\" Ayumi shouted as Shiro, Conan and the others looked at the chessboard and thought about it.

\"That idiot.\" Conan glanced at it and saw Motota holding his hands on the windowsill while Mitsuhiko grabbed him.

\"...\" Xiaobai was speechless about this.

"Hmm... Perhaps.\" After watching Yuantai climb into the room with the windowsill propped up, Xiaobai looked at the chessboard placed below and seemed to think of something.

And then...

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