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No Fergus, I tried it, and didn't work.

I just setup a random position where one King would bare the other, and the other lone King could bare the first on his next move. Based on a quick view of your new code in Shatranj, I expected it to end the game saying that: "Both Kings Bared on Next Move! Game Drawn!", but this didn't happen. The game carried on.

I used a different approach in my Chaturanga Davidson's Variation: (Below is the code for Post-Game 1, for white)

if == 1 count onlylower:
  set enemies onlyupper;
  if > count #enemies 2:
    say Bare King! White Wins!;
    won;
  elseif == count #enemies 1:
    say Both Kings Bared! Game Drawn!;
    drawn;
  endif;
endif;
if == 1 count onlyupper:
  set enemies onlylower;
  if >= count #enemies 2:
    say Bare King! Black Wins!;
    lost;
  endif;
endif;

I'm actually allowing the Lone King to play one more move. If he can bare the opponent's King, the game is a draw. If the lone King cannot bare the opponent on the next move, then he automatically losses the game.