Here are three Shortest
Proof Game problems (well, the 2nd is not a "shortest") from Japan.
They have been sent by Satoshi Hashimoto <hasimt-s(at)rd.tepco.co.jp>
who wrote me a few words about retros in Japan:
"In Japan, there is a puzzle similar to chess problems called tsumeshogi.
In that term, tsume means "checkmate" and shogi is Japanese chess. It's
a highly sophisticated puzzle world like chess problems with a history
of several hundreds of years and a lot of good compositions including
fairy ones. There is a monthly magazine "Tsumeshogi Paradise" devoted
to tsumeshogi, which has about 2000 members. If you are interested in
tsumeshogi and read Japanese, contact:
No.5 Tabuchi bldg. 2F,
Osaka-shi, Osaka-fu, 530,
As for references to shogi, see book reviews of The Problemist
Some of tsumeshogi enthusiasts are interested in chess problems.
a column on chess problems started in Tsumeshogi Paradise 2 years
ago. Because most of Japanese fans are beginners (though they are
experts at tsumeshogi), the column is designed mainly for beginners.
Because of this situation, there are only few original compositions
Japanese. But 3 retro originals composed by Japanese have been
presended in the column. I present you these 3 problems.
I would like you to solve them and let me know expert's comments."
1 - Yukio Hirose
12+16. Proof game
in 28.5 moves
2 - Hiroshi Nagano
16+16. Proof game
in 10.5 moves
3 - Hiroshi Nagano
14+14. Proof game
in 21.0 moves