Hi Everyone!

I am from Germany and have two rule questions about Gin Rummy - a game not so frequently played here.
Reading  the rules on about.com I still I wonder:

- is a player allowed 'to knock' also, if he has two or more cards left over not exceeding 10 points? Like 2, 3, 5, while his other cards are in sets or runs? Or does it have to be one card only, with its value not exceeding 10.

- then, playing it for the first time last Friday, we were surprised how fast the game was over, once one player finished with 'going gin'. My opponent had much left in his hand, he could not put down any of his cards to my sets and on top of their total came the 25 points for me 'going gin'. So we were at a 100 in no time. Is this how it should be? Why not extend the line?
Also, there is a rule book I got from the States ('Offical Rules of Card Games'), generally a very good book, but it said something very confusing (page 151, in case somebody has a copy):

"The player first scoring 100 points or more wins the game. He adds to his score 100 points game bonus." (So far I do understand! But now:) "If his opponent has not won a hand during that game, he doubles his entire score, including the game bonus." (Does that mean, the winner then gets 400 points?) "Each player then adds to his score 25 points for every hand he has won called line or box bonus." (This is puzzling, for the opponent has made NO hand, right??) "The two player's total scores are then determined and the player with the higher score wins the difference between his score and his opponent's." (???)

Can anyone help me with this? I would be most thankful!

All the best from Hamburg!