New answers tagged analysis
1
If you go to this site:
https://ccrl.chessdom.com/ccrl/4040/games.html
You should be able to download pgns of games by month, or games played by any specific engine of your choosing.
Also on the home page:
https://ccrl.chessdom.com/ccrl/4040/
You can search around and find stats of how certain engines score against each other.
0
If White takes the Black queen, Black wins more quickly with ...Rxa1, Rxa1 Rxa1 and another pawn will promote to a queen. If White trades rooks, Black has to wait a few more moves before promoting.
0
Black can put a piece on a square where it checks White's king, and then perpetually check. There isn't enough cover for White to stop the checks.
0
You probably are losing because you aren't reading the engine indications correctly. If you are playing White, the larger positive number is the better move, while if you are playing Black, then you want a 'large' negative number on the reading.
2
For what that's worth, Stockfish 11 gives
Rh2 as +2.6
Kb4 as +2.2
Bxc7 as +0.6
other moves as 0.0
on my machine at depth 45 (will be updating this answer while it digs deeper). Rh2 and Kb4 occasionally switch positions as #1 and #2, so it's still unclear which one of these is truly best. Bxc7 surely isn't, however, at least if you believe Stockfish.
One ...
1
Houdini is severely weaker than LC0. I have seen their evaulations of positions, such as in the Salvio Gambit, which Houdini evaluates as only slightly worse for White(clearly not true), where LC0 states that Black has a sizeable advantage.
Thus, it is more likely that Leela had played the best move. We cannot know for sure until we prove a forced win for ...
3
I analyzed your position with Stockfish 11 ("Stockfish_20011801_x64_modern" to be exact) to a depth of 78 and it returned the following line as the best continuation.
6k1/8/4qp1p/7P/6P1/5P2/6K1/Q7 w - - 0 1
1. Qa8+ Kf7 2. Qb7+ Kg8 3.Qb8+ Kf7 4. Qb1 Qe2+ 5. Kg3 Qe5+ 6. Kf2 Qh2+ 7. Ke3 Qe5+ 8. Qe4 Qc5+ 9. Ke2 Qb5+ 10. Kf2 Qb2+ 11. Kg3 Qa1 12. Qc4+ ...
0
We can't determine a cheater from just an accuracy analysis. Perhaps the player was simply good, or most of the moves were forced, leading to high accuracy. However, for an average player to get 99% accuracy, this clearly is a warning.
There is a better approach to detect cheating. A game can be analysed to see how 'computer-like' the moves are. If a person ...
0
First of all, to refute a gambit, we need to analyse all the lines to a [forced] win. For example, the Latvian Gambit will result in all lines ending with a material advantage for White able to guarantee a win.
However, for the Muzio Gambit, there is no such proof. Black will eventually have to give a knight back to reduce White's initiative, so there is no ...
0
Assuming the engine performing the analysis is Stockfish (sounds reasonable, since the engine is presumably running on CPU) then it's probable the move it considers subpar is 4.c3. Left to its own devices Stockfish will occasionally play the Giuoco Piano, but it will usually play the Giuoco Pianissimo - i.e. 4.d3 instead of 4.c3.
Indeed, the cloud analysis ...
0
Anyway, if two moves certainly lead to a draw, then they are both evaluated as 0.00, so they are not objectively better.
3
It's likely a draw. After going through a few lines (which strengthens the transposition table), Stockfish 11 at around depth 42 gave me 0.74 in the starting position. Especially in such a simplified endgame, this shouldn't be enough for White to claim a win. I also set it to White to move in the starting position.
Some variations I analyzed with Stockfish:
...
1
Yes, if it prolongs and "shortens" the game if you're losing or winning respectively.
And there are tablebases for 7 pcs or less.
Which means chess is solved with 7 pcs on the board.
0
Stockfish on depth-22 states that the position is +1.41 for White. However, eventually if Black gets rid of every pawn but the h-pawn, it's a wrong rook pawn draw.
3
In this case, g8=Q is certainly better, since it makes black have to struggle for the draw, and g8=R would make white struggle for the draw.
7
Well, according to endgame tablebases, g8=R is a loss in 63 ply and g8=Q is a draw. So g8=Q is definitely better...
https://syzygy-tables.info/?fen=8/3k2PB/q7/8/4K3/8/8/8_w_-_-_0_1
6
Well, we can trust the engine in some cases when they analyse, but in this case, we are looking at book moves. Since the Italian Game is perfectly reasonable, don't worry about the 0.3% off.
2
Take the position after 12...Ne5.
[FEN "r3kb1r/ppq1n1pp/2p1Ppb1/4n3/2P2B2/5NN1/PP2BPPP/R2QK2R w KQkq - 1 13"]
There are plenty of tactics here. The e5 knight is pinned to the queen. You're attacking it twice, with your knight and bishop, and it's defended twice, with a pawn and queen. Qd7 would be checkmate if Black stopped protecting that square, ...
18
Probably, as you pointed out, Bb5 instead of Bc4.
The Ruy Lopez is considered very very marginally better/more critical than the Italian by humans, so it'd make sense that the engine used here'd agree.
Certainly, however, the Italian is fine, and the difference is very marginal.
2
practice practice practice. that is the answer to the question.
and there are far more tactics than the few you mentioned.
if you really think you know them all then name another 20 of them.
3
I know every tactical theme pin, fork, weak backrank, deflection, etc.
But upon analyzing this game, couldn't find any.
If you can't recognize a pin (e.g. 9. Bg5) then you don't know what a pin is. Here are 4 tactical themes in the first 20 moves:
9. Bg5 - pin
12. e6 - discovered attack
17. Qe3 - pin
20. ... Qxe6 - self-pin
How can I improve my recognition ...
3
Some general advice about kings cut off on the 7th(or2nd) rank in rook endgames.
Involve your king or get your N to f3.
1.Kg1 Nf5!? {going after the f3 pawn.} 2.Rxc5 Nd4 (2...Kg6 also comes into consideration but
is not tricky enough. although it is my personal fave) 3.Kf1! (3.Ne5?? Rxe5! -+) Rh2=
Involve a pawn!
1.Kg1 h5! {in order to get a pawn to h3 or ...
6
A very uncomfortable position
[fen "r3k2r/pp1n1ppp/3bp3/q2p3P/3P2P1/3B4/PPP2P2/R1BQ1RK1 w kq - 0 6"]
I have analysed this resulting position several times with some great Lc0 and 80+CPU stockfishes. My verdict from that is that white objectively has some advantage, but for humans it is so difficult to understand that they will mess it up.
Also the ...
6
For a Computer, White is Better. For a Human, it's unclear.
White has quite a few advantages here - notably more space and superior development. Black has one major advantage, though. White's king is exposed and shall remain so for quite some time.
Computers excel at positions in which perfect defensive play is required - that is, positions such as White ...
0
Looks like a win for white after Rxc5.
Unless White blunders, Black has no mate.
Look for white to queen a pawn before black can do anything.
1
Im only 1000 in blitz and get 90 - 95 games at least 5 times each day, no it doesn't mean someone is cheating, grandmasters get high nineties every single game.
3
It's definiely not a "bad" option for Black. It can be played at high levels and still get decent results. However, it's not considered a "great" line for many reasons:
As you said, White has multiple set-ups to choose from most of them leaving them with a slight advantage.
The "surprise factor" that may give Black with an edge ...
7
In positions where the side with the Rook is trying to hold back the passed pawns it is often critical how quickly the King can scramble back to base, because the Rook will usually be easy. If for example the King must reach g8, then ..Kxa2 leaves the King with one rank less to cross and therefore (other things being equal) will save a tempo. Therefore my ...
3
First of all, I do not think Black's king would be safe at all on h5. After Kh5 simply Rd4 would threaten Bf3#. Many other concrete threats also come to mind with the king on h5, but the idea is the same: the king is one check away from checkmate, since no squares are available for him. Of course all of this is ignoring the fact that Black can force a draw.
...
2
The gameplay accuracy is a scale from 0 to 100 and it is calculated based on the accuracy of each of your moves. Chess.com collects a lot of data from played games that they use to evaluate which moves are more important for the final accuracy.
The final accuracy is a weighted average and that explains when you play a game with two book moves and a blunder ...
0
I found the following utility that seems to do the task in a very straightforward way:
http://www.lutanho.net/pgn/pgn2fen.html
So I ask, is it hard to code this? If so, why is it software programs don't offer this feature in their exporting options?
0
Dunno but BxP on c7 looks like a winner to me.
Whether black captures with the rook or not the b pawn marches quickly to become a Q
-2
You cant. They are just a rough guide about how you did.
The only factor is who won/lost the game.
1
Check the program pgn-extract (https://www.cs.kent.ac.uk/~djb/pgn-extract). It has what you probably need. Here I copy a fragment of its help:
Include a position evaluation after each move (--evaluation)
The --evaluation argument causes a comment to be appended to every move, which contains an evaluation of the position immediately following that move. The ...
2
"Is the Caro Kann Advance variation winning for White?"
Not proven so far.
Engines and centaurs (engine plus human) are in continuous improvement so the last word on a particular opening variation is yet to be uttered.
You don't give a link to the game nor the particular configurations of the engines.
For the tournament to find the strongest engine ...
1
I have recently analysed the Short variation of the Advance Variation quite thoroughly with Leela and heavily with Sockfish, and I can say that I have not found a forced win at all.
There are several ways to a draw for Black. Overall, lines with an early ...c5 performed better.
0
If that wasn't enough White's rooks are very mobile and can attack down the d or e files, potentially doubled, or supported by the queen.
7
White has a protected passed pawn on c5, which means almost all endgames will favour White.
The d4 square is also a great spot for the white knight (indeed the engine suggests Ne2 preparing for that) If Black has to give away his g7 bishop, then the king could be in trouble due to the weaknesses of the dark squares around it. And things aren't much better if ...
8
Using the Dorfman method to evaluate the position, White is statically much better, and probably close to victory (which may explain the +2.3). Both kings are safe and the material is balanced. However:
The d4-square is a fantastic outpost for the knight, which it can reach easily via e2.
The pawn in d5 is isolated and weak. Its advance will be prevented by ...
11
Here's my theory for this position. The engine is evaluating +2 advantage because black's rook can be trapped.
First, watch carefully, that rook on h5 is isolated from the main game and has only another safe square to move (i.e, f5), where it can be backed by Queen (on e6), as well as the pawn on g6. So it is dubious to exchange white queen for a rook.
So ...
5
I don't know the game you're referring to, but I doubt it shows, all by itself, that the Caro-Kann Advance is winning for White (and therefore the Caro-Kann itself is losing for Black.) Surely Black could have varied somewhere before getting down to tablebases.
The fact that an engine will play the opening at all means it is programmed into the engine's ...
1
Yes. I did it a little while ago. It's of course possible. You will need to be technical capable of doing it as it won't be like a one-click installer.
0
"Has anyone tried to host Lichess to their local machine, that ran
smoothly offline? If not, is it possible to do so ?"
I was asked to do such a thing a couple of years ago as a paid project. I'm retired and really have no interest in doing paid work so I handed on the idea to one of my sons who is a young and very enthusiastic software engineer.
...
1
when the pawns are on c6 and d5 that means that your dark bishop is your best bishop
after c6 and d5 the dark square around them are weak and the bishop takes control of those square.
the bishop on e7 is not controling alot of square on c5 and b4 it can get kicked around with a3 b4 or Na4.
I am 2100 take that into account.
1
a general rule is to solve problems with devolopment, here your problem is your N is under attack and you threat QA8+
the threat of QA8 is very dangerous and is winning.
3
Qf3 threatens the king with Qa8 on the next move. Your oppenent could capture your knight and defend with Nb8 afterwards, but this will cost him a knight as well (and also a bishop or an exchange of queens), so he won't capture your knight.
Always keep in mind that there are four possible defences if one of your pieces is under attack:
Move the piece to ...
10
Welcome Ludi!
As RemcoG points out, Qf3!
This is an example of a zwischenzug or "intermediate or interpolated move".
Often a surprise move or an unexpected move.
Black thinks you are forced to attend to your attacked knight, but you have a surprise in store!
But, how would you come to consider such moves?
Your knight is attacked as you point out, ...
22
It comes with the threat of Qa8+, which forces black to return the knight.
And white is up material, so exchanges are good.
5
Bd6 has two big advantages that haven't been mentioned. The first is that it protects the b8 square for your rook. Your rook naturally belongs on the half-open file, and White really wants to play Bf4 to keep you from doing that. (You can put your bishop on d6 later if that happens, but you've wasted a tempo and exchanging bishops makes it easier for the ...
5
Bd6 is the most active square. No, there's not an immediate threat but it does attack h2 which could turn into something later.
Be7 is too passive. It's not smart to "protect against pins" that haven't even happened yet. There's lots of unpin combinations that actually lead to the pinning side being worse. Also, white can't really capitalize on a ...
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