Here is the link to the blog entry I found interesting.
In 2004 I went to Japan, where I took up Shogi, and I noticed a great improvement in my offhand chess games as a result. I also became more agressive, which probably helped me in blitz online.
I read similar stories from time to time. Does shogi has something special to improve your chess? I think the same thing would happen if one learns to play bughouse. The difference between shogi and bughouse to chess players are the followings I think;
- Need to recognize shogi pieces and remember how each piece moves in shogi, while no need to remember pieces and their moves in bughouse since they are the completely same as chess except for dropping.
- Need to use the pieces which does not exsist in chess. Only King, Rook and Bishop in shogi moves as they do in chess.
- Number of squares are bigger in shogi(9x9=81) than in chess/bughouse(8x8=64).
If shogi has something special to improve your chess comparing with bughouse, the secrets may exist in or around the difference listed above.