White to move. What is the best continuation for White?
8/8/R4p2/5k2/2n4P/2p2K2/P7/8 w - - 0 51
Alena, Told you, very difficult problem. Here is the comments section from its previous posting on Ms.Polgar's site: <a href="http://web.chessdailynews.com/very-difficult-endgame-challenge/#comments">Link</a>. I wrote 8 comments, 7 of which were analysis trying to solve it. Like I wrote above, I found the first move pretty quickly since I had a pretty good background in such rook endings already, but there were parts of the solution that were difficult to find and understand. The line you give is the one I considered to be the most resistant. If you have access to the Lomonosov Tablebase, it would probably be worthwhile to study all the variations. Unlike the Nalimov, however, the Lomonosov must be purchased still.
Here is the solution for the second puzzle.
I had to look through my encyclopedia of rook ending to understand how to solve this endings with rooks on h-file.
Also the flexibility you can have knowing these endings...you can see them in the middle game and go for them and your opponent might be awed at the beautiful work!
You know though Yancey, this is really good practicing blind chess. And the hard endings after gruelling hard over them when you are shown the answer you remember it so much better.
Surpriselover, it is a tough, tough puzzle. The first time I encountered it, I found the first move pretty quickly, even if I didn't really understand all the details. Even then, I struggled to find both the best lines for black and white afterwards. Of course, you can now buy the Lomonosov Tablebases, and it will no doubt give you the full details on this 7-man problem right from the starting move.
After I struggled with last night and gave my answer I put it on Analyze This and it gave a different answer. Next time I will not spoil the try it again option...I do not want to spoil it for anyone else...thank you Yancey!
Surpriselover, and if black replies to 1.Kd5 with 1. ....Kh2? In any case, the line 1.Kd5 Rxh3 is already a theoretical draw. Try again.
Kd5!...with the potential to use the black pawn for shielding on the way to the h6 pawns aid (a6-h6 vertical file) and giving the black rook less options. What to do with black? ...Rxh3, Ke4! ...keeping a watch on that rook. ...Kh2 Preparing to check white over and over and avoiding mate threats. Kf5 d5, Kg6 Rg3+, Kh7 d4, Rg8 Ra3, Kg6 Ra6+, Kg5 Ra5+, Kg4...the black pawn shields white for a tempo!
Love those hard endgame puzzles...working on it now!
That second one Yancey is great..
Here is the solution for the first puzzle.It's really very very easy. I solved as soon as I saw it.
7R/8/2Kp3P/8/7r/7P/8/7k w - - 0 1 White to move and win.
Only two puzzles for Alena tonight- one fairly easy, but one that is amazingly difficult: 5Kbk/6pp/6P1/8/1p6/1p5R/1P6/8 w - - 0 1 Find the shortest mate
Considering that the win seems pretty straightforward after 1.Ra4, I think the intent of this problem is to encourage one to understand why white can't defend against the c-pawn by moving the king on move 1.
It's an interesting ending.
I don't see why Ra3 is bad either?