# A Master of Go — powered by that neural network

> Go AI opponent and study tool powered by neural networks. (iPhone/iPad app by Yuji Ichikawa.)

- Source: https://appshunter.io/ios/app/a-master-of-go/id1442035374 (this page in markdown: same URL + `.md`)
- Developer: [Yuji Ichikawa](https://appshunter.io/developer/1442035373)
- Category: Games, Education, Board, Strategy
- Price: $6.99 with in-app purchases (on sale, was $9.99)
- Rating: 4.60/5 from 79 App Store ratings · 154 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 397 MB
- Languages: American English, Japanese, Korean, Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2018-11-16
- Data updated: 2026-08-31
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/a-master-of-go/id1442035374/reviews.md

## What is A Master of Go?

It is a Go AI featuring a neural network of that strong, open source AI. Leela Zero, ELF OpenGo, PhoenixGo, Minigo, SAI, and optionally KataGo!

You can use it as a strong opponent, and as a good teacher at the time of study.

With M2 processor of iPad Pro, the playouts are performed over 650 times per second with ELF OpenGo weight v1, and with A15 Bionic processor of iPad mini, over 200 times per second! Both exceed notebook computers and is comparable to desktop computers. With M2 processor of iPad Pro,  the playouts are performed over 250 times per second with KataGo b18c384nbt!
Other famous weights are also included.

For your information, the playout speed on the iPad Pro 9.7 inch model(A9X processor) will be about 10 times per second, and the one on the iPhone 6(A8 processor) will be about 1 time per second. I think that even so it is stronger than most amateurs, but I am sorry that patterns of misreading ladders will increase.
Please be careful when considering purchasing.

Enjoy it!

## Key features

- Powerful neural network AI
- Multiple AI weights included
- Strong opponent
- Study and teaching tool
- High playout speeds
- Comparable to desktop computers

## Pricing and in-app purchases

Base price: $6.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| KataGo Engine | $14.99 | one-time |
| 200 coins | $0.49 | one-time |
| KataGo Human Imitation | $5.99 | one-time |


## Recent user reviews (10 of 154)

All indexed reviews: https://appshunter.io/ios/app/a-master-of-go/id1442035374/reviews.md

### 5/5 — 검토 버그

*2026-07-06*

업데이트 이후 검토모드에서 뒤로가기가 안되요 빨리 수정해주세요

### 5/5 — 手順を進められない

*2026-07-04*

アップデートしてから手順を進める矢印▶️ボタンが機能しなくなっています。
良いアプリなので改善お願いします。

**Developer response:** アプリのご利用ありがとうございます！

ご不便おかけしております。
不具合を直したバージョンを申請中です。
少しお待ちください。

### 5/5 — 제목없음

*2026-06-19*

갑자기 안돼다가 수를바꿔서 하니까 갑자기 꺼져요.어떻게 해야돼요?

### 2/5 — ユーザーに優しくないデザイン

*2026-04-17*

AIの候補手の反応はいいのですが、デザインが使いにくいです。
ユーザーに優しく設計いただければ嬉しいです。

### 5/5 — 非常好用，不過可以新增全局分析的功能嗎，分析好手惡手跟水平評分。

*2026-03-20, version 7.5.1*

同上

### 5/5 — App works great, after figuring out how to use it

*2026-02-07*

The app works perfectly. keep in mind, you CAN play with japanese rules against 20 kyu human-like katago model, however you can only do this on 19x19 board after first purchasing the katago model, and THEN the human like model. the app is great and the developer is VERY responsive and helpful.

**Developer response:** Thank you for buying the app and I am sorry for your disappointment.

KataGo human imitation requires KataGo.
You must buy KataGo before imitation.

I am sorry for confusing you.

### 2/5 — Won’t let me buy the Katago human ai

*2026-01-22*

When I click on the in App Store, the buy button doesn’t work next to the katago human imitation engine. It doesn’t work for the 200 coins and for the full katago engine. This is very disappointing because the human engine is the only reason I purchased th is app.

**Developer response:** Thank you for buying the app and I am sorry for your disappointment.

KataGo human imitation requires KataGo.
You must buy KataGo before imitation.

I am sorry for confusing you.

### 5/5 — 맥북에서 사용할수 있게 해주세요

*2025-10-07*

맥북에서 사용할수 있으면 얼마나 좋을까요? 수요가 있을거라고 생각합니다 꼭 만들어 주세요

**Developer response:** 이중 과금은 되지 않습니다.
그렇다면 Apple에 문의하여 환불을 받으십시오.

### 5/5 — ルールを選べない

*2025-08-16*

いざ購入してみると、蓋を開けてみたらTromp-Taylorルールしか出来ませんでした。日本ルールも追加して、デフォルトでルールを選べたら嬉しいです。

**Developer response:** アプリのご購入ありがとうございます！

ルールの選択は、KataGoオプションの機能の一部になります。
KataGoオプションは、ルール変更以外にも、
・デフォルトエンジンと比較して圧倒的強さ
・勝率だけでなく目数差も算出
・置き碁での適応力の高さ
・自陣/敵陣/戦場の可視化
など多くの特長を備えています。

是非、ご検討ください。

### 3/5 — アゲハマの数わからんし

*2025-06-07*

かってに更新されて対局中のが消されたのは唖然
いちいち更新のたびにダウンロード要求されるのも
他はいいのでだいぶ減点して⭐️三

## Frequently asked questions about A Master of Go

### What is A Master of Go?

A Master of Go is a mobile application that functions as a powerful Go AI opponent and a study tool. It utilizes advanced neural networks, including popular open-source AIs like Leela Zero, ELF OpenGo, and KataGo, to provide a strong playing experience and aid in game analysis and learning.

### What are the key features of A Master of Go?

The app features multiple strong neural network AIs, including Leela Zero, ELF OpenGo, PhoenixGo, Minigo, SAI, and KataGo. It offers high playout speeds, making it a formidable opponent and a valuable tool for studying Go strategies and improving your game.

### How much does A Master of Go cost?

The application is free to download and use, but it does offer in-app purchases. The specific costs for any in-app purchases are not detailed in the provided description, but users can enjoy the core functionality without immediate payment.

### What devices is A Master of Go compatible with?

The app's performance varies significantly based on the device's processor. It is designed to run on modern devices like iPads with M2 processors and iPad minis with A15 Bionic processors, offering very high playout speeds. Older devices like the iPad Pro 9.7 inch (A9X) and iPhone 6 (A8) will have considerably lower speeds.

### Who would benefit from using A Master of Go?

Go players of all levels can benefit from this app. It serves as a strong AI opponent for practice and a teaching tool for studying game patterns and improving tactical understanding. The performance on higher-end devices makes it suitable for serious players looking for a challenging and analytical experience.

## Version history (last 5 releases)

### 7.8.0 — 2026-08-24

This version is an improved release.

1. Updated KataGo to v1.17.1.
2. Updated KataGo_Latest to the transformer model (b11c768h12nbt3tflrs-fson-silu).
3. Changed KataGo_A14- to kata1-zhizi-b28c512nbt-muonfd2.

### 7.7.6 — 2026-07-20

This is a bug-fix release.

1. Fixed an issue where the error message was not displayed when the KataGo benchmark failed after being tapped.

### 7.7.5 — 2026-07-14

This version includes minor improvements.

1. Added numbers to the 4-split variation diagrams to make the sequence easier to follow.

### 7.7.4 — 2026-07-10

This is a bug-fix version.

1. Fixed a bug where the app crashed when opening a second KataGo window on iPad.

### 7.7.3 — 2026-07-09

This is a bug fix update.

1. Fixed an issue where the move numbers unexpectedly became smaller on iPad.

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## More apps by Yuji Ichikawa

- [围棋师傅S](https://appshunter.io/ios/app/s/id1549630756)

All apps by Yuji Ichikawa: https://appshunter.io/developer/1442035373

## Related topics

[elektra go](https://appshunter.io/ios/topics/elektra-go) · [tygem go lite](https://appshunter.io/ios/topics/tygem-go-lite)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*