I have done it:

– Wrote RetroPie 2.6.0 (v2) to an SD card
– Booted up and quit Emulatoion Station and got back to a terminal prompt
– Expanded disk to get full size
– Copied “Battle Chess.adf” to /home/pi/RetroPie/roms/amiga (FTP)
– Copied “kick13.rom” to /home/pi/RetroPie/BIOS/ (FTP)
– Ran Emulation Station and selected Amiga which opened UAE4ALL
– Clicked “A500″ with mouse, selected Battle Chess for DF0
– Clicked “Save config for current game”
– Clicked “Reset”

Result: Black screen :/
On WinUAE the Workbench boots and all is fine… (with the same kick and game)