p.
Promotion is mandatory for a pawn reaching the last rank. However, they can only
promote into a friendly piece captured (which is back on the board). If none is
- available, the promotion on last rank is impossible and the pawn cannot move.
+ available, the promotion on last rank is impossible and the pawn cannot move
+ (but still gives check).
p.
Pawn promotion is possible (but not forced) on the two ranks before last,
p As in the orthodox game, win by checkmating the king.
p.
- Note: I changed the author's starting position, to facilitate random start.
+ Note: I changed the author's starting position, to increase randomness
+ (and uniformize with other variants).
Thus the castling rule was introduced compared to the rules described
on chessvariants.com.