Questions tagged [evaluation]

The evaluation of a given position

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17 answers
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How many points is each chess piece worth?

I am a beginner at chess; please answer this question for me. How many points is each chess piece worth?
Jethik's user avatar
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31 votes
4 answers
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Why does Stockfish undervalue pawns when compared to the classical "a piece is worth three pawns" approach?

I was taking a look at values engines give to pawns and piece and was quite shocked by Stockfish values for middlegame (Mg): PawnValueMg = 128 KnightValueMg = 721 ~ 5.6 pawns BishopValueMg = 825 ~ ...
emdio's user avatar
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29 votes
4 answers
7k views

Should a chess engine be aware of opposite-side castling?

I often hear chess experts and chess articles say that when opposite side castling occurs on the board that it is important to launch an attack on the enemy player as fast as possible. Up to the point ...
Tauist's user avatar
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25 votes
7 answers
3k views

What proofs for refuted gambits are there?

I've stumbled upon this article a while ago, and I've also seen refutations for the Muzio Gambit (Joseph Kling & Bernard Horwitz - Chess Studies on Endings of Games). I'm wondering what other ...
Valentin Brasso's user avatar
20 votes
4 answers
5k views

Why do chess engines sometimes miss good moves (or take forever to spot)?

It is not the first time that I found a greatly superior move than the chess engine did, it even takes them a while to understand these moves after you make them. For example, the move 15 ... Bf2 in ...
ajax333221's user avatar
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19 votes
2 answers
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Is this a draw despite the Stockfish evaluation of −5?

I reached this position as Black: [Title "Black to move"] [FEN "8/8/8/3q4/6kp/7R/6P1/6K1 b - - 3 46"] And I felt that I cannot make any progress and so it feels like a draw. ...
user21820's user avatar
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18 votes
8 answers
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Why don't chess engines take into account the time left by each player?

Firstly, I am not suggesting that there is anything wrong the way engines are implemented at the moment, by analyzing only the current position regardless of time left by the players. This is great ...
ihavenoidea's user avatar
18 votes
2 answers
5k views

Is there an easy way to detect a draw in a King + Pawn vs King endgame?

I know the basics of opposition, but I am struggling to evaluate positions for drawishness in King + Pawn VS King endgame. A lot of times it is useful to know whether you should make an exchange. For ...
Salvador Dali's user avatar
18 votes
3 answers
2k views

Does GM Larry Kaufman's "principle of the redundancy of major pieces" truly exists? Or could this effect be caused by the number of Pawns instead?

The following is an extract from The Evaluation of Material Imbalances by GM Larry Kaufman. I put in bold characters everything that was important for this question. https://www.chess.com/article/view/...
Fate's user avatar
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17 votes
8 answers
20k views

What is an accurate way to evaluate chess positions?

I've been interested for a while about a computer chess AI algorithms (and got the chance to work on one at some point) like Minimax, and as the core component of these algorithms is the so-called ...
Charles Menguy's user avatar
14 votes
2 answers
3k views

How do chess engines decide which best line to play when the game outcome is within their horizon?

Inspired by the Hot Network Question "In this puzzle, why does white play dxe5?", when a chess engine is in a position that it can definitively call lost, drawn, or won, what policy is used to decide ...
which-line's user avatar
13 votes
2 answers
1k views

Is there an engine evaluation technique that factors in 'time'?

An interesting game played out between Wesley So and Levon Aronion1: [title "Wesley So vs Levon Aronian"] [fen "rn4k1/p2bP1b1/2q5/1pp2p1Q/2p5/8/PP3PPP/3R1RK1 w - - 0 1"] So was in ...
stevec's user avatar
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13 votes
1 answer
1k views

Does blitz change the relative value of position vs material?

The way I see it, true gambits trade material for position, which in turn could give you opportunities to regain more material. However, in blitz play, you are less likely to notice those ...
MWB's user avatar
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12 votes
3 answers
4k views

Computer evaluations: How trustworthy are they?

Fritz 12 with Rybka gave a friend of mine an evaluation of +3 for white in this endgame position, [Title "White to move"] [FEN "8/8/8/3k3p/3P3K/2P3R1/8/7r w - - 0 1"] which turned out to be a draw. ...
chubbycantorset's user avatar
12 votes
8 answers
8k views

Bishop vs Knight

I read in a book written by Fischer about piece values, and he said that a knight is worth 3 pawns, and a bishop is worth 3,25 pawns. I know that in closed positions knights are better, and I have ...
Ghita Tomoiaga's user avatar
12 votes
3 answers
961 views

Are knights more powerful in Duck Chess?

In the chess variant Duck Chess (full rules), each player moves the shared blocking "duck" piece to any free square on their turn, taking away one or more moves for the opponent. One ...
SE - stop firing the good guys's user avatar
11 votes
12 answers
9k views

Is chess a zero sum game?

"Chess is a zero sum game" is a claim you see often, even on this forum. Game theorists will tell you that it is just obvious. Either the game is a draw, nobody wins or loses, or one side wins and ...
Brian Towers's user avatar
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11 votes
3 answers
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How are the scores decided in Chess?

Consider the following pictures: I would like to understand the following: My understanding is that it depends on the opponent's move against our move. Am I right? What is the minimum and maximum ...
user avatar
11 votes
1 answer
2k views

Why does Fritz prefer underpromotion in this position?

Why does Fritz prefer underpromotion in this position? How can underpromotion to bishop evaluate so much higher than normal queen promotion? Can this be a bug in the Fritz 14 chess engine?
Muleskinner's user avatar
11 votes
1 answer
1k views

Why is this position in the 3.d4 d5 Petroff equal?

I'm trying to learn some theory about the Petroff and was reading about the 3.d4 d5 sideline. Eventually, the position below is reached. [FEN ""] 1.e4 e5 2.Nf3 Nf6 3.d4 d5 4.exd5 exd4 5.Qxd4 ...
AKemats's user avatar
  • 477
11 votes
2 answers
5k views

Is there an online chess evaluation engine with a REST API?

Is there an online chess evaluation engine with a REST API? I'd like to be able to send a game or position (with castling ability presumably) to a simple REST API and get back the positional ...
Peter Cotton's user avatar
10 votes
3 answers
3k views

Why does Stockfish suggest capturing a bishop in this position when my opponent can fork my king and rook?

The position in question is: [FEN ""] [StartPly "13"] 1. d4 c5 2. Nf3 cxd4 3. Nxd4 Nc6 4. Nc3 e5 5. Ndb5 Bb4 6. Bg5 Bxc3+ 7. bxc3 Qa5 8. Qd5 Nge7 9. Nd6+ Kf8 10. Qxf7# 1-0 It's black turn and the ...
AKP2002's user avatar
  • 1,098
10 votes
4 answers
2k views

How would the min max algorithm of a chess engine work in the case of 3 player chess?

I understand that for 2 player chess if an engine is playing white, then the engine uses a min max algorithm, which assumes that black will always make the move that is best for black, or worst for ...
Anders Gustafson's user avatar
10 votes
9 answers
910 views

How to determine if a position is open or closed in a "rigorous" fashion?

I am creating a set of chess positions to be used [as a data set] for a project. It's based on supervised machine learning, but I need to have labeled data (see more italicized text below) before any ...
PartyLovingHermit's user avatar
10 votes
3 answers
4k views

Why is this seemingly quiet and normal position actually -3?

rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1 [Event "Casual Blitz game"] [Site "https://lichess.org/GETmjlLj"] [Date "2021.08.15"] [White "WMArsyHuda&...
Mateen Ulhaq's user avatar
  • 1,264
10 votes
3 answers
794 views

Big changes in engine's evaluation after considerable time

I hope this question hasn't been asked before. I am looking for some examples where, say, the latest Stockfish or Komodo engine (or possibly some of the top NN engines) evaluates a position as plus or ...
the_fox's user avatar
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10 votes
5 answers
3k views

Why doesn't Stockfish announce when it solved a position as a book draw similar to how it announces a forced mate?

I notice that when Stockfish has solved a position to mate it announces that checkmate is unavoidable in some number of moves so it's impossible to mistaken a position Stockfish has solved as a win ...
Anders Gustafson's user avatar
9 votes
6 answers
4k views

Why is 11. .. h6 such a bad move?

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 [Event "?"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "?"] [Black "?"] [...
maxmitz's user avatar
  • 675
9 votes
6 answers
2k views

How to analyse positions more accurately as a total beginner?

In this position I thought I was winning with white, like +2 or +2.5. But Lichess Analysis shows evaluation as -1.4. [Title "Black to move after Ne5"] [fen "rn3rk1/1p1b3p/p2n1qp1/3PNp2/...
insipidintegrator's user avatar
9 votes
5 answers
11k views

How to automatically evaluate a player's performance in a game?

Suppose I have a completed game. I don't have Elo ratings of the players. My purpose is to evaluate a player's performance in the game based solely on his moves. Can this can be done automatically ...
Dennis Golomazov's user avatar
9 votes
3 answers
2k views

Why is it a mistake to capture the forked rook?

In a recent game, I forked a queen and rook with a knight. After seeing no immediate threats from 8. Qf4 I immediately captured with 8. ...Nxb3. Apparently this was quite a mistake (a 213 centipawn ...
actinidia's user avatar
  • 369
9 votes
4 answers
926 views

Is there some resource of non-tactical positions to practice analysing?

In point 3 of this answer RemcoGerlich implies that a good way to improve, for a class player, would be to develop the skill of “[taking] any position and [figuring] out what’s going on”. It seems to ...
11684's user avatar
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8 votes
3 answers
5k views

Stockfish: What is the maximum (minimum) centipawn score that a position might be evaluated at?

With the exception of checkmate and mate-in-x positions, what is the highest centipawn score that a chess position might obtain upon Stockfish evaluation? This is a practical question because there ...
BLUC's user avatar
  • 199
8 votes
2 answers
1k views

How do chess engines evaluate a position if the position is in the middle of an exchange?

In the minimax algorithm, chess engines do a depth-first search as far as they can calculate ahead, and then evaluate all these final positions. Then, using these evaluations they work backwards one ...
Inertial Ignorance's user avatar
8 votes
2 answers
2k views

Why is h4 much better than h3?

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 [Event "Rated Rapid game"] [Date "2021.08.09"] [Result "0-1"] [Variant "Standard"] [TimeControl &...
maxmitz's user avatar
  • 675
8 votes
5 answers
3k views

What relative point values of pieces do engines use?

Humans use: Pawn = 1 Knight = 3 Bishop = 3 Rook = 5 Queen = 9.5 Bishop pair = +0.5 But I would like to know what relative point values do engines use (preferably strong engines, like Stockfish, ...
Fate's user avatar
  • 4,750
8 votes
1 answer
861 views

Why do Engines show a fraction for the "Depth" and "Current Node" values?

Forgive me if this has been asked elsewhere, but I've both Googled and searched here at CSE and cannot find an answer. When I'm using an Engine for analysis (in this case, Stockfish 15), I've noticed ...
MikeMitchell's user avatar
8 votes
1 answer
300 views

Why does stockfish move quality increase non-monotonically with increasing depth? -- selected moves at depth 3 are worse than depth 1

I have been working on a project looking at how stockfish moves change with increasing computation time (here search depth), and have found something peculiar - namely that the quality of moves that ...
Evan Russek's user avatar
8 votes
2 answers
2k views

The Knight is stronger in Rapid/Blitz than it is in classical time controls. How many centipawns does the Knight gain in Rapid and in Blitz?

In blitz, the knight is stronger than the bishop. - Vlastmil Hort I am using this point value system for classical time controls (at least one hour per player): Pawn = 1 Knight = 3.25 Bishop = 3.25 ...
Fate's user avatar
  • 4,750
8 votes
1 answer
369 views

Elements to take into account when evaluating 'board strength'

As part of a demo for a rules engine I'm dreaming up, I'd like to do an evaluation of a chess board that communicates each side's general strength at that point in time. Advanced things like ...
tmesser's user avatar
  • 415
7 votes
3 answers
1k views

Why is this "slow move" with the king a good move?

rn1qkb1r/1p3pnp/p1p1p1p1/3pP3/3P2P1/2NBBQ1P/PPP2P2/2KR3R w kq - 0 13 Stockfish (depth 30) says the best move is Kb1 with +1.5 evaluation. I'm having trouble to understand why. The a2 pawn is not ...
user avatar
7 votes
1 answer
771 views

Why is b4 the only move suggested by every chess engine?

The only move suggested here by every chess engine is 17. b4 Can anyone please advise why is it so important? [fen "r3k2r/ppp2pp1/7p/3pP3/3P2b1/5N2/RP1KBPPP/7R w - - 0 1"]
Md. Mohsin's user avatar
7 votes
2 answers
2k views

How is average centipawn loss calculated when a mate is missed?

As far as I know, to calculate the average centipawn loss, we calculate S1 - S0 for every move, where S1 is the evaluation (in centipawns) of the position before the move and S0 is the evaluation (in ...
Wais Kamal's user avatar
  • 3,040
7 votes
3 answers
1k views

What do chess engine evaluation scores (+1.3, -3.2) really mean?

I know that chess engine evaluations like +1.3 intuitively mean that White is evaluated to have an advantage equivalent to 1.3 pawns of material, or that -3.2 means that Black is evaluated to have an ...
badroit's user avatar
  • 271
7 votes
3 answers
206 views

Can chess engines recognize equivalence between two positions?

The positions [FEN "8/4kn2/4br2/8/8/3Q4/4K3/8 w - - 0 1"] with white to move [FEN "8/8/8/2Q5/1K3bk1/5rn1/8/8 w - - 0 1"] with white to move [FEN "8/2nk4/2rb4/8/8/4Q3/3K4/8 w ...
Anders Gustafson's user avatar
6 votes
4 answers
308 views

Will writing a chess engine help my chess?

At first the premise seems absurd - the computer engine relies much more on brute-force search (Shannon's Type A Strategy) over selecting a few strong lines with heuristics (Type B Strategy). But can ...
qwr's user avatar
  • 3,627
6 votes
3 answers
1k views

Why is 5. f5 so necessary in the Dzindzi-Indian Opening/Modern Defense: Pterodactyl, Beefeater Variation?

I have played a couple of games as black with this line. It is a simple plan: to put pressure on the weak c3 and c4 pawns. This line is mainly known as the Dzindzi-Indian Opening, according to the ...
user avatar
6 votes
3 answers
4k views

What's the difference between a tempo and a tempi? At the start, how many tempo/tempi is White up? On average, how many tempo/tempi is one Pawn worth?

What's the difference between a tempo and a tempi? At the start, how many tempo/tempi is White up? Half, one, or two? At the start of the game (before White has even made his first move), how many ...
Fate's user avatar
  • 4,750
6 votes
1 answer
275 views

Looking for an opening that had been wrongly evaluated for years

I'm looking for an opening I saw in a book (not a chess book). The opening was about 10 moves long, and the author stated that the evaluation after the last move shown had been considered for many ...
user avatar
6 votes
3 answers
664 views

What is considered a decisive evaluation of a board in chess?

Following on from this question, it was suggested in answer and a discussion in the comments that an evaluation of a board of +1.5 is 'decisive' in the sense of allowing an estimation of which side ...
user1997744's user avatar