It will stop a lot of strong pieces from promoting to Gold General.

That will completely spoil the game, right? If every piece would gain strength on promotion it would almost never be good to make 1-for-1 trades, as it would leave the opponent with a promoted piece. With every strong piece a suitable protector it would be trivial to keep all pieces sufficiently protected, and any attempt to attack would be suicidal.

The default promotion scheme uses hook moving pieces promoting to Gold Generals and I had changed it along with ways to get new hook moving pieces from promotion. I also had changed the promotion of the Left and Right chariots to Standard Bearers. I also changed the name of the 8-Way Knight to a Jumping Frog. "Jumping Frog" makes sense because the promoted knight according to my customized rules jumps like a FIDE Chess Knight.

When I customized the promotion rules of Maka Dai Dai shogi for the first time, the Lion Dog promoted to a great elephant as in Dai Dai shogi but I changed it to a Lion Frog which is like a lion dog but can capture up to five pieces in a turn.

@HGMuller Please change the Furious Fiend's move in the interactive diagram for both Dai Dai and Maka Dai Dai shogi to Lion + Lion Dog (KNADcaKmcabK+KADGHcavKmpafcavKcafcmpafK)

Fix the asymmetric mnemonic images for the flipped view.

The AI doesn't work. Can you fix the bug?

Apparently only the Emperor was considered royal, and because initially it is not present the AI thought it had alread lost. I now also made King and Crown Prince royal.

Beware that this is a quite old Diagram, from the time it did not have an AI. When the AI was introduced it will also be possible to use it here, but it has not really been tested on a game of this size, and might think very long. You might have to switch the search depth to a lower value to make it move in acceptable time.

Every time the AI captures a piece with a promotable piece, it promotes the piece to an Emperor. Can you fix it?

I am already working on it. It appears that the custom script embedded in the page to handle the promotion rules requests chess-like promotion choice rather than shogi-like, when deferral is possible. And the AI then of course always chooses the most-valuable piece, which is the Emperor.

I also stumbled across another problem, which is that the value assigned to the Emperor is so high that when you make the promotion in combination with a capture, the gain exceeds a mate score, so that it thinks the move is instantly winning.

[Edit] I adapted the script embedded in the page, and it should now work correctly. The problem of the inacceptably large Emperor value will have to be fixed in the general Diagram script. But as long as there is no Emperor, this should not be a problem.

The AI doesn't work now. Are you still working on fixing the Emperor bug?

It works for me. I reduced the maximum guestimate for a piece value to 12000, which should solve the Emperor bug.

In this page, the promoted lion's move is different. It should be a lion + a lion dog. This seems odd because the lion dog is visualized as a locust Q3 move. Western sources write simply a Q3 without the locust move for the lion dog.

Western sources are usually wrong. Of course on can question if there actually is something  like THE original historic rules, as different manuscripts not always agree. So rules might have changed with time and place, like they did for medieval Chess. But since a Teaching King is described as Queen plus Lion Dog, and its move diagram is drawn as that of the Queen with three perpendicular line elements on each move close to the origin, it is pretty certain the LD was more than Q3.

The FF should probably be changed here to conform to this.

Change the Furious Fiend NOW!