Tatsuya Sanmaidō
Japanese shogi player

Tatsuya Sanmaidō (三枚堂 達也, Sanmaidō Tatsuya; born July 14, 1993) is a Japanese professional shogi player ranked 7-dan.
Early life and apprenticeship
Sanmaidō was born in Urayasu, Chiba, on July 14, 1993. His grandfather was an acquaintance of shogi professional Kunio Naitō, who recommended Sanmaidō learn shogi. Sanmaidō often went to practice at the Kashiwa Shogi Center to improve, and entered the Japan Shogi Association's apprentice school at the rank of 6-kyū under the guidance of Naitō in September 2004. Promoted to the rank of 3-dan in April 2013, Sanmaidō finished second in the 53rd 3-dan League with a record of 14 wins and 4 losses to obtain full professional status and the rank of 4-dan in October 2013.
Shogi professional
Sanmaido defeated Taichi Takami to win the 2nd Jōshū Yamada Challenge Cup in 2017.
Promotion history
Sanmaidō's promotion history is as follows:
6-kyū: September 6, 2004
3-dan: April 2013
4-dan: October 1, 2013
5-dan: July 27, 2017
6-dan: November 24, 2017
7-dan: September 4, 2019
Titles and other championships
Sanmaidō has yet to appear in a major title match, but has won one non-title shogi tournament.
Begin with the source’s own compact description: “Tatsuya Sanmaidō” is japanese shogi player. The dossier treats that line as a proposition to test through Tatsuya, Sanmaidō and Japanese, not as a finished interpretation.
Why this record matters
The phrase “japanese shogi player” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Chronology provides the most reliable spine for this subject; interpretation should follow only after identities and dates are secure. The source revision retrieved here is dated May 6, 2026. The linked authority identifier is Q17159261. None of the 1 selected statements returned an explicit reference. The first chronological checks are 1993, 2004, 2013 and 2017.
Later biographies can compress uncertainty and repeat inherited reputations, so apparently settled claims may still require comparison. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Read biographical claims against dates, named institutions and the cited references. Distinguish a subject’s later reputation from evidence produced during their lifetime.
- Establishing names and roles
- Building a first chronology
- Locating cited institutions
Personal papers, civil or court records, institutional files and the scholarship cited by the source.
Three-step research path
- Establish the record: confirm the title “Tatsuya Sanmaidō”, its source revision and the description used here.
- Expand the search: follow Tatsuya Sanmaidō primary sources, Tatsuya Sanmaidō archive and Tatsuya research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Tatsuya Sanmaidō”?
- Which primary records establish identity, chronology and institutional ties?
- How has the subject’s reputation changed across later accounts?
Search terms from this dossier
This entry incorporates text from “Tatsuya Sanmaidō” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.