Questions tagged [analysis]

Questions relating to the objective assessment of a position. The assessment may entail which side has the advantage, or what the best move might be.

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9 votes
4 answers
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Has anyone done a correlation of castling with winning and losing?

I saw this question: How often does castling occur in grandmaster games? The statistics are interesting. The answer states that they do so about 90% of their games. So, the move seems pretty valuable....
Mark Goldfain's user avatar
6 votes
2 answers
295 views

Is Nxd5 playable in the Italian Game: Two Knights Defense?

The following move is considered dubvious in lichess.org opennings explorer because of the sacrifice in f7: [FEN "r1bqkb1r/ppp2ppp/2n2n2/3Pp1N1/2B5/8/PPPP1PPP/RNBQK2R b KQkq - 0 5"] 1... ...
user avatar
1 vote
1 answer
282 views

Did Lichess Level 8 truly lose this game?

Jonathan Scrantz played this game against Lichess Level 8: [Title "Jonathan Scrantz VS Stockfish Level 8 (3000) after 9. Kh1"] [FEN ""] [Startply "17"] 1. e4 e5 2. Bc4 ...
user21820's user avatar
  • 2,779
0 votes
3 answers
166 views

Hamppe-Meitner, the final verdict?

[FEN ""] 1.e4 e5 2.Nc3 Bc5 3.Na4 Bxf2+ For those of you who never heard of Hamppe-Meitner. Now I dimly remember that a super engine somewhere found a White win, but even the bringer of the ...
Hauke Reddmann's user avatar
1 vote
1 answer
833 views

Optimising Stockfish parameters when batch-analyzing with python-chess

I am running a python script that analyzes a large batch of PGN games (each of ~5,000 games) across and exports the games evaluations. It calls Stockfish 14 to analyze each game at depth 20. **[EDIT: ...
David Smerdon's user avatar
2 votes
1 answer
312 views

Why is forking the king and rook a blunder in this Halloween Gambit line?

[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR"] [Title "Halloween Gambit Game"] [StartPly "22"] 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Nxe5 Nxe5 5. d4 Nc6?! 6. d5 Ne5 7. ...
hb20007's user avatar
  • 1,072
6 votes
1 answer
400 views

Why should Black capture with different pawns in these similar Spanish game variations?

As a general “rule”, I have read that pawn captures toward the center should be preferred. I have found 2 different positions which look similar but the best way for Black to recapture with the pawn ...
hb20007's user avatar
  • 1,072
2 votes
1 answer
143 views

Can Black draw by perpetual check?

In this position, from the game Carlsen-Radjabov, it is White to move. Is it possible to get rid of the checks? [Title "Carlsen-Radjabov, World Blitz Championship, Moscow Russia, 11/18/2010"]...
user1448393's user avatar
4 votes
1 answer
236 views

Analyse a blunder

Black (me) to move. I took the knight at f3 with my knight at e1. However, Lichess analysis shows that this move is a blunder, and suggests to take the bishop at g2 instead. IMO, I am winning no ...
null's user avatar
  • 143
2 votes
1 answer
225 views

Is it possible to put special pieces on a chess.com custom board?

I would really like to create custom positions with custom pieces (and maybe even variants) to play with my friends because we have always enjoyed playing custom variants. So for example a board with ...
Leo's user avatar
  • 21
4 votes
4 answers
751 views

What are the strategic ideas behind Bf4?

rnb2rk1/ppq2pbp/2pppnp1/8/2PPP3/2N2N1P/PP2BPP1/R1BQK2R w KQ - 0 9 1. Bf4 Nh5 2. Bh2 e5 In the game, I played Be3; but the engine seems to like the line above. Why is Bf4 better (in a strategic way) ...
John Mars's user avatar
  • 151
12 votes
4 answers
1k views

Why is it a blunder to capture this pawn even if its defender is pinned?

[FEN "1r1q1rk1/p4pp1/3p1b1p/2pQ4/4P3/P1P2P2/1P2B1PP/1K1R3R b - - 0 20"] [Title "The Position"] 1... Bxc3?? In this position, I believed that the best move for Black is Bxc3. It’s ...
hb20007's user avatar
  • 1,072
1 vote
2 answers
176 views

Why wasn't Ne5 a mistake when I could just win the exchange in one move?

I had this position arise in a game: [FEN "4qrk1/3rppbp/1p4p1/p2P4/1pBP1B2/1P2PN2/5PPP/R2Q1RK1 w - - 2 21"] [White "Kevin"] [Black "lichess AI level 3"] 1. Ne5 {I ...
Kevin's user avatar
  • 181
-4 votes
1 answer
89 views

What is the best move in this position? [closed]

I'm trying to make a correct move but I can't find one. When I move, I always get a warning message from chess.com. [Event "?"] [Site "?"] [Date "12.29.2021"] [Round &...
Fmbalbuena's user avatar
3 votes
1 answer
371 views

Why is 2…f6 a blunder in the Center Game?

[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR"] [Title "Center Game"] [StartFlipped "1"] 1. e4 e5 2. d4 f6?? Stockfish says that 2…f6 was a blunder and recommends 2…...
hb20007's user avatar
  • 1,072
3 votes
1 answer
579 views

Why does Stockfish evaluate Nd4 as an inaccuracy in this particular game?

Here is the position: [FEN ""] 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qe6 4. Be2 Nf6 5. Nf3 Ne4 6. Nd4 Qd5 7. nxd5 I have two knights here. One knight is being attacked by the knight at e4. My ...
user avatar
2 votes
2 answers
368 views

White is down 3 pawns in opening, but it doesn't seem like white is really losing

Lichess suggests Re3, Nb1, h4, Bf1, and e5 as top 5 moves. Evaluation is within (-0.7, 0.5). I expected it to be the evaluation to be at most -1. What's going on? [FEN "rnbnk1r1/pp1p1p1p/2p1p1p1/...
BCLC's user avatar
  • 1
4 votes
2 answers
303 views

Why is Nd5 a blunder in this game?

I am surprised when Stockfish engine told me that nd5 is a blunder while suggests me to use my knight at f3 and take the pawn at e5. But, there is a black knight at c6 and if I do that, then, he will ...
user avatar
5 votes
1 answer
902 views

Why is 4…Bb4 an inaccuracy in the Berlin Defense?

[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR"] [Title "Berlin Defense"] [StartFlipped "1"] 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Bb4?! When White castles, ...
hb20007's user avatar
  • 1,072
6 votes
2 answers
1k views

Why is this position a forced mate?

I was playing a game against one of the chess.com bots, as shown below (I was playing as white). On analysing the game afterwards, I'm aware I made a lot of mistakes, but the one I'm really confused ...
ZsigE's user avatar
  • 185
4 votes
1 answer
333 views

Why this exchange

I’m reading a book saying that now black Knight at b4 is under attack so need move away. However Stockfish app suggests take the white c3 Knight first using f6 Bishop , then black will Rcxc3 take the ...
athos's user avatar
  • 185
2 votes
1 answer
222 views

Did Geller resign in a drawn position vs Spassky in a 1959 game?

Did Geller resign in a drawn position vs Spassky in 1959? Or could White win? Here is the famous controversial position, Black to move. [FEN "6k1/6p1/7p/7P/2q1B1P1/Kp3P2/1B6/2N5 b - - 0 1"] [...
user27314's user avatar
  • 265
6 votes
2 answers
646 views

Why don't engines show explicitly that a certain move takes to a threefold repetition (instead of just showing 0.00)?

I get that from the point of view of the engine there's no difference; equal is equal. But for a human analyzing with an engine, I find quite important to note that a move takes to a balanced position ...
emdio's user avatar
  • 2,114
1 vote
1 answer
83 views

Erenburg vs Nakamura 2004

Did Erenburg operated a winning exchange sacrifice vs Nakamura in the Reykjavik 2004 game , Sicilian Najdorf opening ? Or could Nakamura have defended the position ? I analyzed the following position ...
user27314's user avatar
  • 265
7 votes
1 answer
209 views

In French Defense Advance Variation, why does white play an early f4?

Game. First five moves: [FEN ""] 1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. f4 Why did white play f4? My guesses: To defend e5 in case if d4 falls. Pawn pointing theory seems to indicate ...
subba's user avatar
  • 235
4 votes
2 answers
982 views

Engine's 2nd best move

Especially for checking studies (maybe also for teaching), it would be helpful to have an engine finding the second best move and assess it (or even give refutations of all alternatives). For a ...
Hauke Reddmann's user avatar
7 votes
1 answer
342 views

Why is the immediate ...d5 in the 4. d3 Italian not played?

The line may seem suspicious at first, but after a few precise moves (some may say artificial moves) by Black an interesting middlegame position is reached. I did some analysis on my own and probably ...
B.Swan's user avatar
  • 3,469
3 votes
1 answer
320 views

How is c4 the best move in this position?

[FEN "rn2r1k1/pp2qpp1/3b1nbp/2pp4/6PP/1B1PBP2/PPPQNK2/RN2R3 b KQkq - 0 14"] 14... c4 15. dxc4 Nxg4+ I set up the above position in Stockfish and the initial analysis was that c4 was the ...
Owen Kelvin's user avatar
14 votes
2 answers
5k views

Why does Stockfish suggest h4 here?

Analyzing my latest game on chess.com, Stockfish says that h4 is the best move here: I followed the line, but I failed to understand the reasoning of this move. Is it for some long-term advantage? ...
DatBoi's user avatar
  • 381
3 votes
1 answer
66 views

Where can Botvinnik's analysis of Botvinnik - Gligoric, Tel Aviv 1964 be found?

I have seen an old post in a chess forum referring to Botvinnik's own analysis of the game presented below. I have searched, but did not find it. Where can the analysis be found? If you can provide a ...
B.Swan's user avatar
  • 3,469
7 votes
2 answers
2k views

How does white stop the three pawns and win this?

I arrived to this position, black, me, to play, in a tournament game, with plenty of time to think on both sides. Stockfish gives initially +55 and finally mate in 27 for white. Fortunately for me, my ...
user avatar
6 votes
4 answers
421 views

Why does Stockfish give an evaluation of +7.42 here?

[fen "r3k1nr/pppqn2p/5p2/b5p1/3PP3/1BP2QBP/PP1N2P1/R3K2R w KQkq - 3 14"] This game was played by me on chess.com recently. (I am white). The material balance is +1 (for white). Then why is ...
CoolCoder's user avatar
  • 199
-5 votes
1 answer
96 views

Jobava vs Milton 2005 Skandemborg game [closed]

In the following position, from the above game, the book ROOK vs Minor pieces endgame give AN almost easy win for White. Yet I tried on my Houdini 6.02 and got a draw instead. The position is WHITE ...
Stefano's user avatar
  • 379
22 votes
2 answers
3k views

Why is ..Kh8 so much worse than ..Kg7 after Nf6?

I just "failed" this Lichess exercise. Main line is Stockfish's, secondary is mine's. [FEN "r5k1/3N1p1p/2p1p1pb/3pP3/p2P3q/5P2/PP2QP1P/R4RK1 b - - 2 19"] 1...Bf4 2. Nf6 Kg7 {-5.4 ...
walen's user avatar
  • 638
2 votes
1 answer
205 views

Rook vs Bishop endgame

In the following endgame position, from Dautov vs Heinemann, from the book FUNDAMENTAL CHESS ENDING, what happens with perfect play? [FEN "R7/5pkp/4b1p1/3p4/8/5P2/5KPP/8 b - - 0 1"] The ...
Stefano's user avatar
  • 379
1 vote
1 answer
157 views

A suggestive opposite color Bishop ending

The following position appeared to drive even modern engines crazy! [FEN "8/8/b1kP2p1/P5P1/8/BK6/8/8 b - - 0 1"] BLACK to move will get the following results: Komodo 24.1 64-bit depth 61= 3....
Stefano's user avatar
  • 379
8 votes
1 answer
196 views

Reanalyzing old chess books

Computers were demolishing analyses way before they became God (see e.g. here), but latest at ELO 3000 or so it became humiliating. Do you know instances of chess books explicitly rewritten years ...
Hauke Reddmann's user avatar
-2 votes
1 answer
159 views

A rook endgame from a classical book

From the game Kozul-Kurajica, Sarajevo 1998: [FEN "2r3k1/5pp1/1p5p/3p4/8/P5P1/1P3PKP/4R3 w - - 0 0"] In the above position; Stockfish 12 at a depth of 42 evaluates the position the position ...
Stefano's user avatar
  • 379
0 votes
1 answer
108 views

Position Analysis - Win or Draw - Efimeko v Rublevsky 2009

Is the current position winning or equal , and with the perfect play what would be the resulting position. [Event "Karpov Poikovsky"] [Site "Poikovsky RUS"] [Date "2009"] ...
Stefano's user avatar
  • 379
0 votes
0 answers
159 views

Is the following position a win for White or a draw?

The deceptively simple 11 piece position is hard to decifrate. In a Sicilian Defense, Paulsen variation, the following position appeared on the board: Grandellius vs Andreikin, Black to move. What ...
Stefano's user avatar
  • 379
-1 votes
1 answer
83 views

King's Indian Attack position analysis

So, after some 20 moves, we have reached this position. Who is better ? What should be the ideal plan/threat for both white and black ?
AnjumSKhan's user avatar
24 votes
3 answers
9k views

Why does chess.com consider this promotion a blunder?

I've just played a game on Chess.com, and I'm surprised that the engine considers a promotion that I made a huge blunder. Like, my position was rated -62.8 (basically a won game), and after I promoted ...
Fabio says Reinstate Monica's user avatar
2 votes
1 answer
177 views

Is it possible to measure play strength by analysing games of a player?

I am thinking on a way, most ideally on a software tool, what could get one of more games of a player, analise them, and gives an estimate on his play strength (as Elo/Glicko rating). Is it possible? ...
Gray Sheep's user avatar
4 votes
4 answers
313 views

Why exchange the knight for the bad light-squared bishop?

Here is a recent game in the King's Indian I had as Black: [Event "Rated Rapid game"] [Site "https://lichess.org/za0zcaTi"] [Date "2021.08.23"] [White "tomx2"] [...
James Ko's user avatar
  • 1,967
2 votes
1 answer
1k views

How do I convert a move from coordinate notation to algebraic notation?

The following Python code gives the best move in coordinate notation: import chess import chess.engine sfEngineTxt = "E:\Chess\Stockfish\stockfish_14_x64_modern" sfEngine = chess.engine....
Hal Heinrich's user avatar
5 votes
3 answers
196 views

Tiniest readable board and pieces design

Has anyone developed a graphic design format for representing boards within a very tiny amount of space? I'm thinking along the lines of how sparklines were developed to allow a line chart to be ...
Steve Bennett's user avatar
4 votes
1 answer
129 views

Karkops,M vs Dautov R. Is this a win really?

Karsten Müller analyses this position as win for black. 8/R4p2/6p1/4k2p/p6P/r5P1/5PK1/8 b - - 0 44 He thinks 44.. Kd5! is the only move to win. I tried to follow his suggestions whilst playing ...
Koenig Lear's user avatar
1 vote
1 answer
187 views

Python-chess : How to make infinite analysis in multiPV mode?

I need to run infinite analysis in multiPV mode. How to do it right? My code doesn't work. original_fen = "7k/1b1r1pp1/3Bp1np/1p2P1q1/8/1PQB2P1/2R2P1P/6K1 b - - 3 23" original_board = chess....
anfam's user avatar
  • 11
3 votes
1 answer
132 views

Pattern Recognition - Chess Tactics

I have a collection of ten thousand games of a player. Is there a way to look which kind of tactics does the player miss on most often? Which tactics does he need to focus on?
shoonya's user avatar
  • 307
5 votes
1 answer
308 views

I can't understand this puzzle

I came across this puzzle and even after I learned the answer I couldn't quite understand what's going on. I understand that we amaterial advantage by capturing the knight with a pawn, but I can't ...
gscgomes's user avatar

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