The kids are talking about soccer, and Conan's not amused because he wants to investigate the Haneda family. He's looking up the news on his smartphone and sees that there's been match fixing in shogi games and even worse a body found so the games have been suspended as investigations are ongoing and the police have no leads.
The only thing left with the body was a shogi table with one leg and he can't figure out what that means. Ayumi asks about what "fixing" means and there's a discussion about where the word came from. (Haibara thinks it's Sumo.) but then Chuukichi shows up and says it's from Igo (Or Go, like from Hikaru).
Chuukichi knew the guy who got killed, since he played him once and he used an unusual move. Ayumi figures out he's on a date with Yumi because he's not wearing his kimono and he's clean shaven. He says it's not a date, but he's off to meet someone important. He leaves and then a lady who's obviously not Yumi (it is Yumi) is obviously not stalking him. (she is.) Genta asks if they're fighting or something and she says they aren't, but he's been acting funny so she's trailing him. (As in he's been going out secretly more often.)
Yumi thinks she's just being overly worried but Haibara says it's likely he's cheating, lol.
She then doubles down on ~~stalking~~ trailing him and drags Conan in to help against his will. Conan asks her if she's ever met his parents, and she says no --but she's heard he lived with a rich family who had a son who was a shogi genius up until he died in an accident. (Koji Haneda) Chuukichi inherited his dream to be the best at shogi and here we are.

Chuukichi goes to "star donuts" which is a place Yumi introduced him to so now she thinks he's shopping there for her....until he talks to some girls out front. She gets pissed and reveals herself (And I should add the girls refer to her as his girlfriend and she doesn't deny it.)
Turns out he's running a shogi practice group for these girls. One girl: Mana Katsumata is the daughter of the current shogi senior player Chikara Katsumata. The other girl is Shoko Uriyuu. They both have interest in learning shogi from Chuukichi.
Another dude is there: Kousuke Hishinuma and he has instant coffee which everyone agrees tastes nasty cause it's kinda lukewarm now.
They head in to meet the other person there Genda, and you guessed it, he be dead. Conan notices that the shogi table there only has two legs and wonders if this is connected to the case he read in the news.