Hi,

Because of shrinkflation, I'm proposing a half-patch to accept castling after setting up a position with SciSys Chess Champion Super System MK IV.
Half patch because I can't quickly found enough space for the 9 bytes of a complete patch.

When you setup position (EP mode), ssystem4 first delete all castling possibilities with many others initialisations (same loop to 0).

So I neutrilize with 2 nops the initialisation of the castling flags : second part of half patch.

The first part of the patch is...from you : Before enter in EP mode, you must press "NEW GAME" to accept all castling.

My half patch is on the first rom file (c45021_ss4-lrom):
Modify
07BB : 85 21
by
07BB : EA EA


Cordialy,

mychess.