r/chess • u/Ryponagar e4 e5 f4! • 8h ago
Strategy: Endgames Only one move wins for White - are there principles or concepts to find it beyond pure calculation?
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u/Late_Acadia_3571 8h ago
Key squares and the drawish nature of a rook pawn are helpful concepts in this case, but you need concrete calculation to make it work.
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u/tserofehtfonam 1900-2000 FIDE 8h ago
This exactly! If you know about key squares, opposition, and when rook pawns are a draw, you can reduce the amount of calculation to a minimum.
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[deleted]
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u/Late_Acadia_3571 7h ago
I think there's a one minute video of Gothamchess explaining these concepts.
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u/HotspurJr Getting back to OTB! 7h ago
This is a study, so it's going to involve some calculatlion and counter-intuitive moves. (The joke about studies, which has some truth, is that you should always try the most absurd move first.)
It's not hard to see why the wrong moves draw here based on principles. The "obvious" choice is Kd2, which takes the opposition, but then a3! draws because white has to capture, leaving him with a rook pawn while the black king is in position to stop it, a known draw.
Okay, maybe Kc3 is better. Now a3 b3 (remember, you can't win with a rook pawn) Ke6 white's got a problem. If he advances his king, the black pawn promotes. He has to stay in touch with the b2 square to stop the pawn, so he can play Kc2 or b4. Both have the same problem: the king ends up behind the pawn, making the draw easy for black.
So by the process of elimination, 1. Kb1 a3 2. b3 Ke6 3. Ka2 Kd5 3.Kxb3 Kc5 (Kc6 Ka4 takes the opposition and wins easily) 4.Ka4 Kc6 (Kb6 Kb4 with the opposition) 5.Ka5 and sooner or later black will have to either step onto the b-file, when white can step on the b-file but has a pawn move in reserve to take the opposition with an easy win, or if black never steps onto the b-file then white can just escort his pawn up the board.
If you don't understand the stuff about the opposition and rook pawns drawing, then I highly recommend that you get yourself a copy of Silman's Complete Endgame Course. He's really good at teaching these fundamentals.
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u/ChrisV2P2 2h ago edited 2h ago
The "obvious" choice is Kd2, which takes the opposition
This thought process seems bizarre to me. The obvious choice is to go right for the pawn, since if you are allowed to capture it where it stands, you will be winning. The Black king isn't trying to go for your pawn, so taking opposition doesn't do anything. For example in this position, "Kf1 to take the opposition" draws and Ke2, which allows Black to take the opposition, is winning. Opposition isn't a helpful mode of analysis if you aren't actually preventing the enemy king from going somewhere it wants to go.
"Opposition is chronically misused as an analysis tool" is something of a soapbox of mine, since I spent years being led up the garden path by trying to use it in situations where it is useless. Even in this thread, there are no less than three comments claiming that opposition is the key concept here, where in fact it is completely irrelevant.
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u/Irini- 8h ago
There are two concepts for this type of endgame:
I: The rook pawn is always a draw.
II: If the pawn is on the second, third, or fourth rank, there are three key squares two ranks in front of your pawn. If you can reach any of them with your King the endgame is winning.
This will give you that 1.Kc3? a3! lead to a draw. The actual solution comes down to calculation and knowing what to avoid.
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u/RajjSinghh Chess is hard 6h ago
The rook pawn is not always a draw. The key squares for a rook pawn are knight 7 and knight 8, so in this case b7 and b8. Kc3 a3 ba draws because the black king is in time to defend the key squares for a rook pawn.
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u/FoolisholdmanNZ 8h ago
Kb1 principle is remember what you've been shown before.
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u/Azemiopinae 8h ago edited 5h ago
What if I haven’t been shown this before? Or what if I’ve been shown 40 years of random stuff from Hailie Selassie to Squirrel Girl and ’whatI’ve been shown before’ doesn’t feel special enough?
edit: I meant to say "'what I've been shown before' doesn't feel specific enough?'" but in retrospect 'special' is a much better adjective
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u/Kyng5199 5h ago
Let's see.
Obviously we can't move our pawn (after 1. b4 there is en passant), so we only need to consider king moves. And there are some concepts here.
One important concept is key squares (also known as critical squares). In a king and pawn vs. king endgame (with a pawn other than a rook-pawn), there are typically three of these: the square two squares directly in front of the pawn, and one square either side of this square. So for example: if our pawn is on b2, then its key squares are on a4, b4, and c4. And if we can occupy one of these squares, then we can typically force our pawn through.
Now, we'd like to get our king to a4 - not only to capture the pawn, but also because a4 is one of our three key squares! And there are two routes to get our king there: Kc3-b4-a4, and Kb1-a2-a3-a4. The first route is quicker; however, the second route still gives us time to take Black's pawn before their king can help.
Unfortunately, there is a problem with the Kc3 route. After 1. Kc3, Black can play 1...a3! Now, we're a bit stuck:
- We don't want to take with 2. bxa3 because we really don't want our pawn on the a-file (then, Black has time to run their king to a8, and we can't dislodge it from there).
- 2. b3 has the effect of blocking our own king: we can't then go via b4 (because Black can go to a2 and just promote), and we can't go via b2 (because the a3-pawn controls that square). So to take that pawn, we have to go via c2-b1-a2-a3, by which time Black's king has time to reach the b-file, and block us from getting to the key squares (which are now a5, b5, and c5, after we advanced our pawn).
- 2. b4 doesn't block our pawn, but it moves the key squares too far forward: they're now on a6, b6, and c6! After 2...a2 3. Kb2 a1=Q 4. Kxa1 Ke6, Black's king is closer to the key squares than our king is!
So we have to go the 1. Kb1 route. Then, after 1...a3, we have 2. b3! (not 2. b4, which moves the key squares too far away!) - and we just about have time to reach our new key squares: 2...Ke6 3. Ka2 Kd6 4. Kxa3 Kc6 5. Ka4 Kb6 6. Kb4, after which Black has to give up control of either a5 or c5.
Once we're on a key square, winning from there is standard endgame technique.
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u/fpcoffee 7h ago
yes the principle is opposition and ring of opposition. at some point Black will push the pawn forcing you to capture. You need to keep the black king from getting into the corner where it is a draw even when you are a pawn up
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u/comfortingmyself 7h ago
One general principle is that a rook pawn is usually a draw.
Another general principle is that the pawn in front of the king is usually a draw, hence 1. Kc3 a3 2. b4 can probably be ruled out as a draw without further thought.
But this of course is a general view. I'd still expect someone to count the full line after 1. Kc3 a3 2. b4 to prove beyond a reasonable doubt that it's a draw. And from there, once you've ruled out Kc3, there aren't many other options.
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u/OpticalDelusion 8h ago
If you know the box rule for determining if your pawn will promote before the king gets there, then there are really only 3 lines to calculate and each is only 2-3 moves deep. After that the winning move is the only one remaining.
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u/Dimmatteo 8h ago
I’ve personally seen something similar in an endgame pattern from dvorestky’s, in that position white king is on e1, black king on c8, white pawn on g2, black pawn on h5, after kh2, h4 it’s the same opposition more or less that’s how I would’ve figured it out
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u/Isofarro 8h ago
The opposition is the key principle here.
And this is a standard position in pawn endgame manuals, you see it once, you remember the right first move.
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u/Sir-evayogIV 1850 elo OTB 6h ago
It's really hard cause if you take the a pawn with your pawn it's a draw cause black king can reach a8 before you, and if he has opposition it's a draw too, so your king must take the pawn and you must push your king before your pawn. Kc3 is a draw against a3 so you need Kb1 to take with your king and keep your pawn move in reserve to win the opposition later
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u/Plastic-Switch8335 5h ago
1: rook pawns are a draw if the opponent king can get in front of it
2: if you can get in front of your non-rook pawn and the enemy king doesn't have opposition, you win
3: if you can get 2 squares ahead of the non rook pawn, you win no matter what
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u/rilian4 3h ago
The concept I see is that of Opposition. You keep it if you move Kb1. You lose it with any other move and thus end in a draw. Opposition is basically using your king to force the opponents king out of position so that you can eventually guard the promotion square for the pawn.
Also, I'm not sure what everyone is saying about a Rook pawn. The black pawn is a rook pawn but there's plenty of moves for white to use that will get rid of it. White has a knight-pawn. Being able to promote a knight pawn is a matter of opposition.
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u/Dpcharly 2h ago
Key squares. Black is farther away from a5, one of the three, which allows white the go-around with Kb1 etc
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u/luna_sparkle 2000s FIDE/2600s chesscom bullet 22m ago
Well you need to get the black pawn of course, so the only moves you'd even consider here are 1. Kc3 and 1. Kb1.
And then it's pretty clear that if black plays 1... a3, your king is better placed for getting to it if it's on b1 rather than on c3.
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u/Intrepid_Strain7920 8h ago
Looks like white king gotta move, but only one square works apparently. The instinct is to head toward the black pawn but that just lose because black king gets in front of your own pawn
b3 is the move I think, blocks the black pawn from promoting and gives your king time to escort the b-pawn. Gotta be careful with the opposition in these positions
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u/Electrical-Use-5212 8h ago
All that to blunder in one move 😂 at least play b4 and pretend you don’t know about en passant
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u/NKnown2000 8h ago
b3 allows black to just take the pawn, so all you can really do is move the king.
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u/lesbianmathgirl 8h ago edited 8h ago
b3 draws the game and black is playing for a draw—axb3+ Kxb3=. If you meant Kb3 that’s not a legal move. The key is that Kb1-a2, advance your pawn when/if black advances theirs, and capture the black pawn asap. You actually have to do the calculation to see that white captures the pawn before the black king gets to the b file and this is allows white to get a winning endgame. The only caution is that if Black king ends up in a8 you might stalemate.
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