Do you miss something on BrainKing.com and would you like to see it here? Post your request into this board! If there is a more specific board for the request, (i.e. game rule changes etc) then it should be posted and discussed on that specific board.
2 players make the same bet - my understanding is that if it's the lowest bet, then they both go into the pond, it it's the highest bet no-one gets the 500 extra points, and if it's the last 2 players who bet the same - they both go in the pond and there is no winner.