I messed up about 4 times in this endgame problem.  That might explain why my endgames are so atrocious.  Give it a try...did you find it simple?  First move is Ke4. 

I would probably play d4 before d6, trying to stop the king from coming to d6. 

but then the king could go to c4, right?

Isn't that why the king is on e5 though?

(to AfafBouardi) Also, I'm pretty sure the idea on move 6 is to try to keep Black's king off the c-file until the pawns are sufficiently advanced.

I'm pretty sure d4 first also works, (if Kc4 d6 or if Kb5 Kf6, either keeps the black K off the c file unless too far back to matter)  have tried it out on computer just to be sure. Not sure where in mentor this is, can you give the lesson reference so I can look at it? 

i like it

Oops, I meant I wanted to stop the king from coming to c5. As MM78 stated, if Kc4, then d6 and he has to go away, and you have time to get to e7 I think. 

I wanted to play 5 Kd6 instead of d6

Just  to be clear I was talking about d4 on move 5 which is the second time white plays d4.  Also the fact that black can play d6 and so can white at some points causes confusion in my posting, sorry. The only 5th move that doesn't work (if you get that far) is Kd6.

I think 1300 is kind of low as this is a tough Chess Mentor problem.  I never solve
it correctly the first time.

6. d3 is a tempo move designed to force black to give up the opposition he just
won in his previous move. 

6.  d4 would work but then you could not play d4 on the next move, and white would thus be forced to move his king instead.

very good!

These moves are by no means forced, in most positions reached every move by white wins as long as it doesn't drop the pawn, because he always has enough tempos avaliable to reach opposition due to his second pawn.

Also, in the position after black's fourth move 4...Kb4, d2-d4 actually wins one move faster for white:

MM78 and RoepStoep...  I think you're right.  I will go back and do the problem on the chess mentor...perhaps I missed that opportunity and it was an alternative correct move.  I did at some point try to push d4 and was told it was the wrong move...I'll check it out. 

I plugged it into Nalimov, almost at every turn there are alternatives for White, and in the original position Black's play is far from best, on move 3 Black should play Kf7 for the most stubborn defense.

5.d4?? is a draw after 5...Kb5 6.d6 (6.Kd6 Kc4 7.Kxd7 Kxd5) 6...Kc6 7.d5+ Kc5 and White must part with his d6-pawn.

MM78...

EOT202 King and two doubled pawns vs. King and pawn lesson in the

Endings, Openings, a Taste of the Middle course.

http://www.chess.com/chessmentor/view_lesson.html?id=1933

afa:...Kb5 6.d6 (6.Kd6 Kc4 7.Kxd7 Kxd5) 6...Kc6 7.d5+ Kc5 and White must part with his d6-pawn.

is indeed a draw, but the correct move like I said earlier is 6 Kf6 and then black cannot get to the c file unlike after 6d6?? which leaves c6 square open

update, I see that the mentor answer (which you gave above) is incorrect. Kf6 in that position definitely wins.

Roepstoep,

In your diagram what if instead of 3...Kb6 black plays 3...Kc4 instead?

Then white loses the opposition and the pawn I believe, so I still don't think d4 works.

 Since we are giving the same line I will be rude and respond for him :-) If 3..Kc4 4d6 and black can take the d pawn but white will be able to capture black's pawn and walk his remaining d pawn home. Basically white gets his king to e7 then sacs the rear of the 2 d pawns when he needs to

So Chess Mentor is using the most ideal moves, yes?