Previously we left off in a Rook + Three pawns vs Rook + Two position. Today, we will wrap this up by extending to a Four vs Three:
|A common position|
Anyone with sufficient tournament experience would have encountered positions this several times in their career. Here, the stronger side (White in this case) wants to use his pawns to grab as much space as possible, creating the "squeeze" position we've investigated in the Three vs Two case (see http://nushsblackknights.blogspot.sg/2014/10/rook-pawn-endgames-three-vs-two-part-1.html). Thus, White to play will not hesitate to play 1. g4! to stop ... h5 and ... f5 (which would destroy Black's pawn structure after the exchange) and gain space in the middle with Kg3, h4 and f4. While Black still has drawing chances, his defensive task will become very difficult.
For the defender, his goal will be to prevent this horrific "squeeze" from occuring. As such, he must deny the opponent space in the centre with the same set of guidelines we've been using: Keep the rook active, and go for pawn exchanges that do not severely weaken the pawn structure. Going by this he should be able to safely trade to a Three vs Two, then a Two vs One, and finally a Philidor/Inverse Philidor position.
Stops White from playing 2. g4; now 2. h3 followed by 3. g4 will lead to a pawn trade favourable for Black.
2. h3 Rc2
Keeping the rook on the b-file continues to tie White's king to the f2 pawn.
3. g4 hxg4
One down, two more to go.
4. hxg4 g5
Now any advance of the f pawn will lead to another exchange.
Or 5. Kg3 Rc3 where Black's active rook continues to annoy White.
6. Rb7+ Kg6 doesn't get White anywhere
7. f4 gxf4+
8. exf4 (D)
|Position after 8. exf4|
Recapturing with the e-pawn gives White the best winning chances; 8. Kxf4? creates split pawns that offers no hope of victory (e.g. 8... Rf2+). Now we have a Two vs One position.
Preparing to push the f-pawn; the immediate 9. f5+ Kg5 gives White no progress.
9. Rb6 is an interesting alternative and Black must be careful of the pin here: 9... Kf7 (9... Rg1+ 10. Kf3 Rf1+ 11. Ke3 and Black must be careful not to play 11... Rg1? because White wins by exploiting the pin after 12. g5!)10. g5 fxg5 11. fxg5 and he should be able to hold out the resulting Philidor Position.
10. Kf3 Rf1+ 11. Ke3 and Black can safely play 11... Rg1 here because there's no pin now!
11. Kg2 Ra1
Threatening to cut off White's king by 12... Ra3
12. f5+ Kg5
13. Rg7+ Kf4 (D)
From the above example we can see that pawn exchanges usually do not help the stronger side. So to repeat my point, his main hope for a win lies in gaining space in the centre with his pawns, something which the weaker side must prevent. We will take a look at another example:
|Another typical position|
Once again, White to play would go for the space gaining 1. e4! , discouraging 1... f5 and preparing for the "squeeze". While Black can still draw here with 1... Ra3 (fencing off White's king), his defensive task here will not be easy.
That said, Black to move is simple: 1... f5! ensures that White will not be able to gain sufficient space in the centre.
2. Kf3 Rc2
Black is happy to keep his rook active on the 2nd rank.
White has to go all in, otherwise Black will continue shuffling his rook on the 2nd rank.
4. Kg5 Rg2
5. Kxg6 Rxg3+
6. Kxf5 Rxe3
After all the pawns fall both sides can call it a day.
Note that at this stage, I no longer emphasize on memorization of positions as compared to the past; ideas like the Lucena, Philidor and Vancura positions should already be firmly embedded in memory. Thus in complicated rook-pawn endgames, all it takes is a few simple guidelines and a consultation of your endgame "database" (your memory!) to chart your way through seemingly complex waters. Remember: It's about concept, not memorization!
That said, let us recap the pointers to look out for in a rook-pawn endgame where pawns are on one side of the board. When the stronger side is one pawn up, his task is to:
- Use his pawns to gain central space so as to cramp up his opponent
- Avoid pawn exchanges until he gets a dominating position
- Try to get a passed pawn
- Create a winning king-pawn endgame/Lucena Position
For the weaker side, he can prevent this using the following:
- Avoid trading rooks unless it creates a drawish pawn endgame
- Keep his own rook active by using it to tie down the enemy king
- Deny the opponent's pawns any central space with his own pawn pushes
- Put his king in front of the enemy pawns (to prepare for an upcoming Philidor/Inverse Philidor)
If that's too much for you to remember... then just take note (nope, not making any references here): Active play good, passive play bad!
Two vs One: http://nushsblackknights.blogspot.com/2014/09/rook-pawn-endgames-two-vs-one.html
Three vs Two (Part 1): http://nushsblackknights.blogspot.com/2014/10/rook-pawn-endgames-three-vs-two-part-1.html
Three vs Two (Part 2): http://nushsblackknights.blogspot.com/2014/10/rook-pawn-endgames-three-vs-two-part-2.html
"Silman's Complete Endgame Course" by Jeremy Silman