Single Comment

I allowed promotion to opponent's gold and silver because capturing one of them will promote piece, wich captures it (for example, if archbishop or dragon can capture silver, it's much better than promotiing berolina pawn to any other piece). Of course, situations, where it's useful are rare. Optional rule, where pawns promotes to captured pieces or hostile general is interesting, but are promoted pieces considered as lost and what if sergeant can't promote if there are no corresponding lost pieces?