5) A piece must promote if it would otherwise have no further legal moves
from that square (for example, a pawn moving to the last row). Otherwise,
the player can choose to promote or not. A piece must move in order to
promote; it cannot save this option for later.

6) Pieces are always dropped unpromoted. A pawn cannot be dropped onto a
file which already contains an unpromoted pawn. A piece cannot be dropped
to a square from which it would have no further legal moves. A pawn cannot
be dropped to give checkmate.

7) Draws are possible, but very rare. Refer to the manual on how games
can be drawn.\
