Why draw?

I was looking around at some games just for fun. (Well I was looking at some games of my opponents) And came across this. Why did they draw?
Doesnt white have this game in the box?
Game 1325827

It looks like a draw to me.
Black plays Bb8 and as long as the bishop remains on that diagonal, white cannot promote his pawn.

How do you suggest white can win?

Sacrificing the rook to draw the defender of the promotion square. Should be possible. Or isn't it?
[edit]
like the end position but with white to move.. or is this impossible
[/edit]

Originally posted by chasparos
Sacrificing the rook to draw the defender of the promotion square. Should be possible. Or isn't it?
[edit]
like the end position but with white to move.. or is this impossible
[/edit]

And black could sac one of his pieces for the pawn, and I believe the endgame is drawn.

no, its possible to checkmate someone with only a rook if the other person has a knight.. I think bishop would be too difficult , but a knight you can eventually box in a corner with the king and rook and take the knight

Originally posted by MIODude
no, its possible to checkmate someone with only a rook if the other person has a knight.. I think bishop would be too difficult , but a knight you can eventually box in a corner with the king and rook and take the knight

its possible to checkmate someone with only a rook if the other person has a knight..

Originally posted by Yozzer
Not always.

Originally posted by ark13
And not always with a bishop either.

Originally posted by ark13
And not always with a bishop either.

Originally posted by Yozzer
Not always.

If white takes the the bishop with the rook, black has 2 choices, take the rook and lose the knight as well, or stay put and protect b8. if black decides to protect, the rook would hae run rough shod over the black knight and king and the white pawn would eventually been promoted. the 2 players decided to draw, but white could have won the game. however, its blacks move, and all this means nothing after black moves and changes the situation(unless black decided to move the king). noone knows what would have hapened, and it was much safer to draw the game then for either player to risk the loss, or even to just delay a possible stalemate from happening.

Originally posted by MIODude
why not always? with the knight there is no colour square restriction.. so.. if patient enough, it would be either possible, or not possible wouldn't it? Or, do you mean, that if played right by the colour with the Knight, they can prevent it?

Originally posted by XanthosNZ
With the stronger side to move:
Longest Mate: 40
Wins: 48.4
Draw: 51.6
Loses: 0.0