# GPSShogi
**Wikidata**: [Q11201767](https://www.wikidata.org/wiki/Q11201767)  
**Source**: https://4ort.xyz/entity/gpsshogi

## Summary
GPSShogi is a computer shogi program classified as free software. It is distributed under the GNU General Public License (version 2.0 or later), granting users the permissions to run, study, modify, and redistribute the software. The project is accessible via its official website hosted by the University of Tokyo.

## Key Facts
- **Entity Type:** Instance of free software; manifestation of Computer shogi.
- **License:** GNU General Public License, version 2.0 or later.
- **Copyright Status:** Copyrighted.
- **Website:** `https://gps.tanaka.ecc.u-tokyo.ac.jp/gpsshogi/`
- **Wikipedia Presence:** Has a sitelink count of 1, specifically on Japanese Wikipedia (`wikipedia_languages: ja`).
- **Google Knowledge Graph ID:** `/g/11x7vgn73`
- **Source Verification:** License details verified by the official project page on the University of Tokyo domain (`gps.tanaka.ecc.u-tokyo.ac.jp`).

## FAQs
### What is GPSShogi?
GPSShogi is a computer shogi program that functions as a manifestation of the game Shogi in software form. It is categorized as free software, meaning it respects users' freedom to run, study, change, and distribute it.

### Under what license is GPSShogi distributed?
GPSShogi is distributed under the **GNU General Public License, version 2.0 or later**. The license statement explicitly notes that users can redistribute it and/or modify it under the terms of the GPL as published by the Free Software Foundation.

### Where can information about GPSShogi be found?
The primary source of information is the official website hosted at `https://gps.tanaka.ecc.u-tokyo.ac.jp/gpsshogi/`. Additionally, the entity has an entry in the Japanese Wikipedia.

## Why It Matters
GPSShogi represents the intersection of artificial intelligence (specifically computer shogi) and the free software movement. By licensing the software under the GNU General Public License (GPL), the creators ensure that the code remains open for study and modification. This is significant in the field of game AI, as it allows researchers and developers to inspect the algorithms, learn from the implementation, and contribute improvements back to the community. Unlike proprietary software, GPSShogi serves as an educational resource and a collaborative tool, embodying the "four freedoms" central to free software while competing in the complex domain of Shogi engines.

## Notable For
- Being a **manifestation of Computer shogi**, a major category of game AI research.
- Licensing under **GPL v2 or later**, ensuring perpetual user freedom to modify and redistribute.
- Being an **instance of free software**, distinguishing it from proprietary or "freeware" alternatives that restrict user rights.
- Hosting on an **academic domain** (University of Tokyo), indicating research or educational roots.

## Body

### Identity and Classification
GPSShogi is explicitly classified as an instance of **free software** and a **manifestation of Computer shogi**. As a free software product, it adheres to the definition of allowing users to freely run, study, change, and distribute the program and its modified versions. It is distinct from "freeware" in that it grants full modification and redistribution rights, not just gratis usage.

### Licensing and Legal Status
The software is **copyrighted** but distributed under the **GNU General Public License, version 2.0 or later**. According to the source reference retrieved on January 14, 2018, the license text states:
> "This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version."

This licensing ensures that GPSShogi remains free software even in modified distributions, a concept known as "copyleft."

### Online Presence and Identifiers
GPSShogi maintains a specific online footprint:
- **Official Website:** The project is hosted at `https://gps.tanaka.ecc.u-tokyo.ac.jp/gpsshogi/`.
- **Wikipedia:** It has a presence on Japanese Wikipedia, indicated by a sitelink count of 1 and the language tag `ja`.
- **Knowledge Graph:** It is tracked by Google with the Knowledge Graph ID `/g/11x7vgn73`.

### Contextual Framework
As an instance of free software, GPSShogi inherits the characteristics of the broader software category defined by the "four freedoms." It opposes proprietary software models that restrict user access to source code. By utilizing the GPL license, it positions itself within the open-source movement, facilitating transparency and collaborative development in the field of computer board games.

## References

1. [Source](https://gps.tanaka.ecc.u-tokyo.ac.jp/gpsshogi/index.php?%A5%E9%A5%A4%A5%BB%A5%F3%A5%B9)