I have permission to modify this executable.

A game called Emperor of the Fading Suns has spaceships in it. When you launch into orbit with a specific ship, said ship lose one movement point.

Thanks for the tip, I'm really excited about making this a function so I don't have words to describe how happy I am for anyone to tell me how to do this. If there is additional info required then I'll post a longer version and link to it.

CodePudding user response：

The trick is to observe that the instruction at 457dd0 and 457dd6 are the same and can be combined.

457dce  8b45e4    mov eax, [ebp-1c]
457dd1  7506      jnz 457dd9
457dd3  c6402f00  mov byte ptr [eax 2f], 0
457dd7  6690      nop
457dd9  ...

You should ensure that there are no jumps to 457dd0 or 457dd6.