Néstor Romeral Andrés
What happens when a player runs out of pieces? That player loses, or the game is a draw (stalemate)?
This condition is trivial to produce, as each piece can be played on top of the previous piece until they are all used up in a tower 30 (or 40) pieces tall.
In this case the game ends in a tie.
BTW, the number of pieces per player has been increased to 20, as Ken Shoda found out that some deadlocks in the diamond board needed a few more pieces to be resolved.