Controls for super lode runner

Thanks a lot but unfortunately it's not working !
Y key is assigned for player 2 as stated in the manual :

And if I select 2 player game and use these player 2 keys, then it's working well (I can dig and move for player 2).

In openMSX If I enable kana key and press Y, I have ん showing as expected, but if I enable kana and press shift + y, I still have ん showing, not ン.
I should check on a real Japanese MSX (I have some), but mixing some standard keys for player 2 (X H G J X Z) and some keys that require enabling kana and pressing shift, seem to be a nonsense to me ...

On real MSX: dig left = 3rd right key from M, right = 4th. / and \ on NMS8250. Kana/CODE key is unnecessary.
The issue is modern keyboard in most part of the world lacks the equivalent to MSX's \ key. On openMSX it must be remapped. The \ key does exist on a Japanese keyboard but it doesn't work for this game. However pushing it together with SHIFT (= entering _) works if the MSX type is Japanese, so pushing SHIFT+F11 on a UK/US keyboard might work too because it is the procedure to enter _.
On webMSX right CTRL is the best alternative for \.

Thanks a lot guys !
Ok so the Japanese MSX keyboard the keys to use are "/" and "_" (the 2 keys at the left of the right shift).
My goal was to configure correctly the key for this game on my Game & Watch port of blueMSX, it's now done thanks to you !
gdx : applying your patch is making it possible to play it on openMSX, it'll be useful for sure

It would be good if OpenMSX adapts the matrix according to the type of keyboard used to avoid that some are unusable.