10

The tablebase suggests it's a win for White, but I struggle to beat my phone. Black's rook seems to always be able to harass the white king to stop white make any progress.

What's the technique to win this endgame?

[fen "8/8/6k1/6r1/8/8/6PP/5RK1 w - - 1 61"]
  • 3
    I wonder why the down votes? If even a 2200+ player failed to win this endgame in an official game, then it must have some tricky elements: chessgames.com/perl/chessgame?gid=1879896 – Maxwell86 Oct 18 '18 at 5:40
  • 2
    Perhaps if he included a few PGNs of his attempts the question would be more useful? – Tommiie Oct 18 '18 at 5:48
  • @Maxwell86 Agreed. This, like many other endgames, is simple but deceptive in its nature. I see no reason to downvote this question since there are some pitfalls to look out for. – Scounged Oct 18 '18 at 10:00
  • Personally i think you should post your game PGN so that you can get clear advice on where you went wrong and how you would have avoided it. – Isac Oct 18 '18 at 16:15
  • 1
    I spent once 20 minutes trying to avoid this endgame on the stronger side. Finally I had to go for it. Won easily, sidestepping all stalemate and fortress tricks, but it's not endgame to underestimate! – hoacin Oct 19 '18 at 16:49
2

I remember drawing a rook and two pawns vs. rook position with g- and h- pawns. I was the losing side. Basically, 1) prevent king mobility, 2) win the rook pawn and 3) play the first rank defense on the g-pawn.

In rook endings, there are many positions where two pawns are not enough to win. Only opposite-coloured bishop endings present a higher drawish trend.

Excerpt From: "100 Endgames You Must Know: Vital Lessons for Every Chess Player Improved and Expanded" by Jesus de la Villa.

But what if the opponent plays accurately, and doesn't drop pawns?

enter image description here

The idea is as follows: set a blockade on the seventh rank by playing Rb7 and Kh7. If the king approaches, check him with your king on g6. If the rook attacks your king on h8, White has no time to move his King forward on the next move because of ...Kxg8.

To win, prevent the opponent from enacting this blockading strategy. Judging by the original poster's position, Black plays 1...Ra5 (or 1.Ra1 Rb5) and blockades.

Draw.

EDIT It is a draw only if the pawns are pushed without thought as another poster suggested. The strategy is to push slowly, one at a time and to avoid drawing positions as listed.

A two pawn advantage in most cases guarantees the win. But there are quite a few drawn positions, particularly when one of the pawns is a RP (as in OP).

Excerpt from Rook Endings. Smyslov and Levenfish.

This book is a great reference on such positions. There are eight pages devoted to it. Here is an excerpt:

enter image description here

  • Thanks. So I guess this is not easy at all. The position 108 you uploaded even needs a master level zugzwang to win! Not sure when you say original post, black plays 1...Ra5 and blockade, draw, do you mean the board position in the question? 6-men database says it's win for white no matter who's on the move. – jf328 Oct 18 '18 at 20:18
  • @jf328 According to Stockfish 9, the position in your original question is drawn. Also, don't forget to choose an answer! – Jossie Calderon Oct 18 '18 at 23:10
  • 3
    @JossieCalderon The position in the original question is a win for white regardless of who is to move, as indicated by the Nalimov 6-piece tablebases. Engines like Stockfish can run into problems caused by the horizon effect in cases like this one. – Scounged Oct 18 '18 at 23:27
  • @Scounged what's the horizon effect? And what's the winning line for White? – Jossie Calderon Oct 19 '18 at 3:18
  • 3
    @JossieCalderon The horizon effect is a term describing the fact that computers have finite computing power, and might misevaluate certain endgames that humans can evaluate correctly with the power of logical deduction. It mostly involves the computer not being able to realize that a fortress is indeed unbreakable. As for the winning line, it's quite long but you can look it up for yourself here: k4it.de/index.php?lang=en&topic=egtb – Scounged Oct 19 '18 at 7:24
4

As we can see from the other answers, there are two things you should avoid: 1) The pawns getting blockaded. 2) Your king getting cut off from the pawns.

It is not the only way to win, but as a matter of technique it is a good thing to advance the h-pawn before the g-pawn. In this way your king can use the g-pawn to hide both from checks from the side and checks form behind. But first use the rook to chase the opponent king as far back as possible.

Example:

[FEN "8/8/7k/R7/6PP/6K1/8/1r6 w - - 0 1"]
[Title "Rook endgame g+h"]

1. Ra6+ Kg7 2. h5 Rb3+ (2... Rg1+ 3. Kh4 Rh1+ 4. Kg5) 3. Kh4

The checks will stop and you can think of the next step.

[FEN "8/6k1/R7/7P/6PK/8/8/1r6 w - - 0 1"]
[Title "Rook endgame g+h"]

1. Ra7+ Kg8 (1... Kh6?? 2. g5#)  (1... Kf6 2. g5+ Kf5 3. Rf7+ Ke6 4. Rf6+ Ke7 5. h6) 2. h6 Rb5 3. g5 Rb1 4. Kh5

Here I would again chase the king away before advancing the h-pawn another step.

If the g-pawn is pinned there is no point in giving a check first.

[FEN "8/7k/R7/7P/1r4PK/8/8/8 w - - 0 1"]
[Title "Rook endgame g+h"]

1. h6 (1.Ra7+ Kh6) Rb1 (1... Rb5 2. g5 Rb1 3. Ra7+ Kg8 (3... Kg6 4. Rg7+ Kf5 5. h7))2. Kh5 Rb5+ (2... Rh1+ 3. Kg5) 3. g5

In this way you can advance slowly rank by rank. Towards the end black will have to defend passively to avoid mate at the back rank. Just for the fun of it I would try to end the game with a knight or bishop promotion like in my answer to this question.

[FEN "r6k/8/6PP/5RK1/8/8/8/8 w - - 0 1"]
[Title "Rook endgame g+h"]

1.Rf8+ Rxf8 2.g7+ Kh7 (2...Kg8 3.Kg6) 3.gxf8=N+!(3.gxf8=B!)(3.gxf8=Q??)(3.gxf8=R??)
-1

Seems trivial, push pawns and use rook to block. I'm not sure what part you would have trouble at. There isn't even a general technique for this because it's a clear cut win for white.

You need to post the position where you have trouble winning in, such as avoiding stalemate traps. It is hard to give a solution from this position.

  • 2
    Actually, there is a general technique for this and there are some points to look out for. To hell with this website if this question gets downvotes... – Jossie Calderon Oct 18 '18 at 5:51
  • 2
    @JossieCalderon Agreed. This site should be for chess players of all levels, not just for the very strong players stroking their own egos. And since people don't seem to have a problem with questions regarding basic opening principles I don't see why anyone should have a problem with questions regarding basic endgame technique either. – Scounged Oct 18 '18 at 10:03
  • @Scounged I shall post an answer to this question. It is a good review. – Jossie Calderon Oct 18 '18 at 17:50
  • I have not yet been able to beat the computer as white when set to highest level. – Michael West Oct 23 '18 at 19:04

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