Yet Another Endgame Problem

Turm_Breuberg

Lincolm

That underpromotion Surprised

Scottrf

Nobody solves that.

laguna4ever

that has to be the most stupid thing i've ever seen, could someone please explain to me what i just saw?

UnseenPhantom

that's a bit different kind of puzzle.

Turm_Breuberg

Check the "Move List" for explanations of the underpromotions.

 

Spoiler:

There are several stalemate tricks possible. In general, if g5 and the h-file are covered, black will draw with underpromotion to knight on f1.

And in the end most computers will not understand that white has to keep the rook imprisoned to prevent sacrifice against g-pawn with drawn "wrong bishop" ending. And finally watch out for opposition when going into the pawn ending. Laughing

laguna4ever

OH, i think i get it! through this analasis it seems that if he had promoted it differently the outcome was more or less likely a draw?

Turm_Breuberg
Metaknight251 wrote:

why doesn't black take the rook on g1 with check after e7?

Because it loses without any chance after destroying the mating threats on h-file and the possibility of a stalemate trap.

Sunshiny

I think there's a slight mistake in your problem. The first promotion should have been a queen, otherwise 4...Rh7+ makes no sense, since 5. Rxh7 isn't stalemate.

Scottrf

Sunshiny, click solution and move list.

Sunshiny

I see. So the problem is faulty since 5. Rxh7 wins for white.

Sunshiny

Nevermind. It leads to the same ending as the queen.

Scottrf

Yeah if he promotes to queen it will be stalemate.

Sunshiny

Good puzzle. What if black tried for the a-pawn?

Sunshiny

Nevermind again. I can see black can't reach it.

Good puzzle. 

Sunshiny

Maybe it is, but the logic behind the moves is sound.

Turm_Breuberg

Of course this is a composed study (endgame problem) and not a game position. And a brilliant one as well. 

5. Rxh7?? is a draw. 

The underpromotions are the only way to victory for white.

Sunshiny

Wait, doesn't black make a mistake by not taking the bishop? 5...Rxh6, and black can draw.

Turm_Breuberg

How can black draw after Rxh6?
Beware: Without bishop or queen covering g5, there is no stalemate.

Sunshiny

You're right.

Was this an actual game, or did someone come up with this puzzle?