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The Way of Tori Shogi is a book that's now available, with strategies, openings, and notated games. It's at ToriShogi.com
I just updated the package, as there was a bug in WinBoard considering dropping of a Pheasant illegal. A Japanese website ( http://www10.ocn.ne.jp/~cha/kotenyugi/tori_shougi/tori_syogi.htm ) mentions a different repetition rule: there the side that first created a repeated position must alter its move to prevent it is repeated for the third time, rather than the one playing out of it. Except during a check evasion; you can always evade whichever way you like. For Shokidoki I adopted the practically identical rule that it is forbidden to repeat, but that perpetual checking is even more forbidden.
My Shogi engine Shokidoki now also can play Tori Shogi (next to regular, Judkins and mini-Shogi). In the WinBoard GUI, it currently looks as follows:
The promoted pieces (not shown here) look like a cannon (+P) and a bird of prey (+Fa).
WinBoard does not have bitmaps for Shogi-style kanji pieces for Tori Shogi, but of course masochistic users that would want these can define their own piece images in WinBoard (through a true-type font).
BTW, the repetition rule mentioned here sounds suspect. (And I could not recognize it in a Google translation of the Japanese Wikipedia, which is even more suspect.) It would imply that a side who starts 'perpetually' checking will win the game, as when the position where his opponent was in check for the first time will finally materialize for the third time, the checked side must now vary, and consequently sacrifice his King, when he is no longer allowed to repeat the only safe evasion. This is very un-Shogi like (and percieved as rather unsatisfactory by orthodox Chess players as well).
The engine + WinBoard (plus another engine, HaChu) is available in a package that supports 7 Shogi variants: Dai, Chu, Sho, regular, Tori, Judkins and mini-Shogi (plus Makruk, Shatranj and Chess-without-castling).
DownloadCourious that this game have same number of piece types and same number of pieces for each type (as was noted in previous comment): 1-1-2-2-2-8 (if think that diffirent quils are same type of pieces)! Is it coincidence or Tori Shogi is invented with some influence of European chess?
There is now a zillions-of-games file for Tori Shogi as well with both Kanji and bird graphics at www.zillions-of-games.com
(Tori Shogi)
I have created a (free) Tori Shogi adaptation using a generic, free/open-source boardgame/wargame engine called the Vassal engine (http://vassalengine.org/) which runs on all major OSes, and allows for both online and play-by-email gaming. If you would like to give it a shot, the beta can be found in the 'Files' section of the Yahoo Group of the same name. P.
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I see that a new study of historical sources on Tori Shogi has been published: https://www.amazon.co.jp/禽将棋についての研究-禽将棋の背景と系統的位置づけ-MyISBN-デザインエッグ社-松本尚也/dp/4815014205/ref=sr_1_1?__mk_ja_JP=カタカナ&keywords=禽将棋&qid=1575339500&sr=8-1
I wonder if any Japanese have read the book and can comment on what new discoveries this book reveals.