Hitachi Go Problems

The Hitachi Go Problems was a weekly (biweekly from April 2018) series of life and death problems by Minoru Harada, a Japanese amateur 8 dan. Each week, two new problems were posted, one "elementary" and one "intermediate", and the solutions to the previous week's problems revealed. Note that his problems are generally challenging and tricky: his typical "elementary" problems far exceed the difficulty of the beginner exercises here.

• The main site was removed in 2024. Problems from 1996 to 2003 can be found on the Wayback Machine at https://www.hitachi.co.jp/Sp/tsumego/past/index-e.html 2,000+ problems were amassed as of 2018. The last added problems date February 2020.... Harada passed away in July 2021.

Here are a few discussions of Go problems.

• Hitachi Number 7
• Hitachi Number 9
• Hitachi Number 17
• Hitachi Number 121
• Hitachi Number 314
• Hitachi Number 703 (was shown on the SL Frontpage in the 1st week of November 2009)
• Hitachi Number 830
• Hitachi Number 840
• Hitachi Number 1163

Reviews

• zinger: Harada's problems are the best I have found on the web - always very realistic game positions. Beware the difficulty labels, however: "elementary" can be tricky, and "intermediate" can be quite hard, at least for me.
• unkx80: I would say that his "elementary" problems often verge into the intermediate/advanced territory. But it is one of the best problem collections.