White To Play and Win

Originally posted by crazyblue
In that winning line you posted Black will win, because his king can stop the f-pawn. But if you play the moves 9 to 11 before you play the moves 6-8, then it's still the idea you had and White will win.

In the 2nd suggestion I dont s ...[text shortened]... n for this for all variations? Somehow I'd like to see it now :-)

Yes, well spotted., crazyblue.
White should play 8. g5 rather than 8. b8=Q which loses a tempo. 7. g5 is also OK.
However, your suggestion of 6. g5 would allow Black to queen with check.

For the 2nd variation there is a pawn race between the White b-pawn and the Black a-pawn, which White would win with check if Black didn't move his king.

1. d5 cxd5
2. a5 bxa5
3. b5 axb5
4. cxb5 Ke7 (because Black will lose the pawn race)
5. b6 Kd7
and a White king side pawn queens.

In general,
if Black answers 1. d5 with exd5 White plays 2. exd5
if Black answers 1. d5 with cxd5 White plays 2. a5 (if 2. exd5 then 2...Kf7 draws).