user10887: I have googled for a little while and found pages and pages of rules and explanations but no documentation. Are there any documented games where the moves have been recorded? It's so ridiculous, I don't believe that anyone has ever been able to finish a game, let alone remember all of the piece movements.


user9805: The answer is yes.
According to jawp article, a game of Taikyoku Shogi was played for Japanese TV show "Tribia-no-Izumi" (=Fountain of trivia), broadcast on 19th May 2004.  The game continued 32 hours 41 minutes and 3805 moves before the first player won.  This seems to be the first full-recorded game of the variant.
Also, there is a webpage
dedicated to Taikyoku Shogi with a playing webservice（大局FLASH, requiring Flash Player）.

10887: <p>I have googled for a little while and found <a href="https://www.google.co.uk/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=3&amp;cad=rja&amp;uact=8&amp;ved=0ahUKEwiuktnRg_DVAhUJPFAKHXwUDNAQFggwMAI&amp;url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FTaikyoku_shogi&amp;usg=AFQjCNFpMBva96MQDb1auqQXaZQ4-HW70g" rel="noreferrer">pages</a> <a href="https://www.google.co.uk/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=5&amp;cad=rja&amp;uact=8&amp;ved=0ahUKEwiuktnRg_DVAhUJPFAKHXwUDNAQFghFMAQ&amp;url=http%3A%2F%2Fwww.chessvariants.com%2Fshogivariants.dir%2Ftaikyoku_english.html&amp;usg=AFQjCNGOTrm5THbmRQT114pKY4c6Pt7c7A" rel="noreferrer">and</a> <a href="https://www.revolvy.com/topic/Taikyoku%20shogi" rel="noreferrer">pages</a> <a href="http://schnee.livejournal.com/1759360.html" rel="noreferrer">of</a> rules and explanations but no documentation. Are there <strong>any</strong> documented games where the moves have been recorded? It's so ridiculous, I don't believe that anyone has ever been able to finish a game, let alone remember all of the piece movements.</p>

<p><a href="https://i.stack.imgur.com/b9bam.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/b9bam.jpg" alt="enter image description here"></a></p>
 9805: <p>The answer is yes.<br>
According to <a href="https://ja.wikipedia.org/wiki/%E5%A4%A7%E5%B1%80%E5%B0%86%E6%A3%8B" rel="noreferrer">jawp article</a>, a game of Taikyoku Shogi was played for Japanese TV show "Tribia-no-Izumi" (=Fountain of trivia), broadcast on 19th May 2004.  The game continued 32 hours 41 minutes and 3805 moves before the first player won.  This seems to be the first full-recorded game of the variant.<br>
Also, there is <a href="http://taikyokushogi.pv.land.to/" rel="noreferrer">a webpage</a>
dedicated to Taikyoku Shogi with a playing webservice（大局FLASH, requiring Flash Player）.</p>
