hi Jan,
My boy's breeder recommended leaving him on a puppy regieme for 'as long as possible', but that we could try him on 2 meals a day from 6 months. If he do well on it we were to put him back on 3 meals for a few more weeks.
We cut out his lunchtime feed from 6 months and gave him 2 larger meals, morning and evening. He eats half his morning meal straight away then saves the other half until lunchtime! I supposed that's what you call a 'win win' situation.
Also, at around 6 months he flattly refused to eat puppy food anymore, so we switched him to a junior dry food and supplement in the evening with tripe and tuna / sardines. He's now 8.5 months and his is doing great on it.
Our old dog was raised on wheatbix for breakfast and in 15 years we NEVER got her to change.
I guess all puppies a different, but to some extent they'll guide you on what to do.
Jackie, Steve and Milo