This page shows Real game mate situations generated by Yaneuraou Shogi Engines.
In the Christmas of 2020, The developer of Yaneuraou Shogi engine, Yaneurao-san has generated almost 5 milion
shogi positions and in that, one of the sides is guaranteed to be checkmated in specified move counts. He made them public as a Christmas gift.
A link to the Original file download can be found in this blog article.
The data was presented as a text file. It is basically millions of lines of SFEN strings.
This page visualizes those data. No solutions are given.
In this page, "Sente(White) to be mated" positions are flipped so Gote side King is always the one to be
checkmated.
In Random tab, select movement range (3 ~ 11) with the slider knobs. Available problem count will be displayed. Hit
the "Random Pick" button to see a randomly picked problem from the specified movement counts.
You can also use "Manual" tab to specify a particular problem as well. Select move length first, then enter problem number and hit <Enter>