Fortress and Blockade

White to play and draw. Is it possible

You can use the computer.

Nice one !! What puzzled me first was the order of the moves.

BTW, you should move this to 'more puzzles' thread, or to 'endgames'.

So the solution:

Another one

White to play and draw

Nobody can solve it ^ ??

It's a little unclear if this is drawn but this is what Rykba came up with.

Interesting but this position is lost for White.

Let Rybka play a few moves more and you will see it.

Can white can win or is it a fortress?

I can see there is some ideas around the bishop sacrifice on h5 when Black's bishop is on a8, but I need to check the lines...

Seems that irontiger is instinctively right at 1. Bxh5 Kxh5 2. g4+ Kh6 3. g5+! fxg5 4. hxg5+ and breaks trough after 4. ... Kg6 5. f6+ Kf6 6. Ke5 Bc8 7. Kd6 immediately calls the bishop back or takes the remaining pawns.

1. Bxh5 Kxh5 2. g4+ Kh6 3. g5+! fxg5 4.Kg7!

2...Kxh4 3.g5 fxg5+ 4.Ke5 g4 5.f6 g3 6.f7 g2 7.f8Q g1Q=)

...and 8.Qh8+ K g(3, 4 or 5) 9.Qg8+ winning the black queen. White wins !

That's the end I did not see at first.

So what is the solution?

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