09323: unkhorse: Unknown game title identified

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
09323	Documentation	Typo	Always	Dec 12, 2025, 15:02	Dec 16, 2025, 16:33

Tester	Wayder	View Status	Public	Platform
Assigned To		Resolution	Fixed	OS
Status [?]	Resolved			Driver	misc/unkhorse.cpp
Version	0.145u6	Fixed in Version	0.284	Build
		Fixed in Git Commit	a3499ad	Github Pull Request #

Summary	09323: unkhorse: Unknown game title identified
Description	Regarding the "unknown Japanese horse gambling game" I found what appears to be material from the same game. “Derby Derby” Manufacturer is "Shin Nihon Kikaku". (Development company is unknown) Source is an advertisement from Monthly Amusement Industry 1981-June.
Steps To Reproduce
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	unkhorse

Attached Files	AMS1981-06.jpg (869,022 bytes) Dec 12, 2025, 15:02 Uploaded by Wayder

No.23884 hap Developer Dec 12, 2025, 16:06	Nice find! Judging from the horses on the photo, the colors are correct too.
No.23894 hap Developer Dec 13, 2025, 13:24	Wayder is this were you got the info from? https://x.com/_QtQ_/status/1996883724844376426 If this account is not you, and you didn't find the unkhorse<->derby derby relation independently, then in the future please credit where credit is due. It's a pretty cool find, after so many years and it would only be right to thank the person for this finding. If I'm wrong here, then sorry.
No.23924 Wayder Tester Dec 16, 2025, 15:29	QtQ requested that I convey this to the MAME team, so I have posted it. It is true that QtQ is the discoverer. It was my mistake not to include that information.
No.23925 hap Developer Dec 16, 2025, 16:27 edited on: Dec 16, 2025, 16:33	Understood, thanks for forwarding this find, and credit for the discovery goes to QtQ.