Questions tagged [engines]
Questions relating to chess engines: any computer program that is able to play/analyze chess positions.
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Highest depth ever achieved
I saw a guy that went into depth 70 with no search moves at 41, 192, 897, 168, and 184 nodes from the starting position on Stockfish a few years ago.
I would like to know if this is still a record or ...
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What Elo rating does The Chessmaster 2000 have?
A recent agadmator video pitted The Chessmaster (NES) against Stockfish 14 NNUE. What is more impressive to me is that this chess engine, released originally in 1986 and written by David Kittinger in ...
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How do you set up two engines to play each other on a cloud server?
I am exploring a semi-novel idea in the London system, where I play 2...b5!? after 1. d4 Nf6 2. Bf4
A main line goes 3.Nf3 Bb7 4.e3 and now:
4...a6 5.Bd3 e6 or Nh5
4...a6 5.c4 bxc4/b4
4...b4 5.Bd3 e6/...
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Stockfish position evaluation component terms in Python?
I saw the excellent Javascript-based guide to how Stockfish evaluates (non-NNUE). Is there a python version out there, perhaps using python-chess?
What I am trying to do (in case you have other ...
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Is there an engine (setting) that favours "reckless" moves?
How I'd define a "reckless" move is that a perfect chain of response moves will quickly put the engine at a disadvantage, but any slightly suboptimal response will make the engine win very ...
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Why does Stockfish change evaluations and best moves depending on the number of displayed variations?
No matter whether I test it online on lichess or locally: Stockfish shows different variations and evaluations depending on the number of variations displayed.
Where does this behaviour come from, and ...
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Why do these convergent lines evaluate differently?
I recently analyzed alternative lines for this puzzle on chess.com.
[Event "French Championship"]
[Site "Val d'Isere FRA"]
[Date "2002.08.23"]
[Round "5"]
[...
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Stack data structure to store chess positions?
One method I thought of for storing chess positions is a stack. This is because when you go one move deeper in the search, you add that position onto the stack, and delete the node when finish, this ...
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Are engines impaired by the 50-move rule?
Are we missing too much from the 50-move rule implementation to engines, whether HCE (Hand-crafted evaluation) or/and NN (Neural Network)?
We know that certain endgames are a win without the rule.
...
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Setting up Stockfish for Droidfish
I would like to set up Stockfish for the android app Droidfish. How do I set up a server for a Windows machine (my linux machine is too weak) using SF13?
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How engines accomplish calculation speeds of 1000kN/s per Core and above?
I am developing a chess engine to improve my Cpp. It works, which means it generates legal moves and it can play them out. I optimized a bit and now achieve ~20k N / s, which is way better than my ...
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Debugging my PERFT coding
I'm stuck debugging my move generation and do move function. I noticed that the castling as actually the problem in my code, but I think I have implemented everything right. I installed some java ...
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Which websites have a ranking and/or a rating list for correspondence chess without engine help?
I am looking for websites that have a ranking and/or a rating list for correspondence chess without engine help. Which ones do exist?
For example, lichess.org has correspondence chess without engine ...
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Has any researcher tried adversarial examples against chess engines?
Even with all the compute in the world, chess engines cannot compute very deeply. So, they have to make use of pruning heuristics and discard moves from the analysis.
Seems possible that even the ...
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Alpha-Beta Pruning and Depth skews checkmate evaluation
I am currently working on a chess engine in golang. I have implemented and tested move generation, making and unmaking. I am working on search and evaluation using Negamax with Alpha Beta pruning, ...
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Issue with connecting engine to lichess bot (uci communication)
My engine is responding correctly to the first inputs from the GUI (as above), but when it receives go movetime 10000 it just crashes and I don't know why. When I test my engine manually in CMD I get ...
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Understanding Null move pruning
I have trouble understanding null move pruning. I understand the concept of a free move for the side that just played a move, but what I don't understand is the code part:
int score = -negamax(-beta,-...
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What are qualitative differences between different engines playstyles and human playstyles?
I remember GM Daniel Naroditsky commented that you can tell that you're playing a computer if you do calculations and none of your plans work because specific moves that were done 3-4 moves ago start ...
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Transposition table cut and all nodes
I have written a chess engine over the last year. Inside my search function I have the following
struct transposition *e = attempt_get(pos);
if (e && transposition_depth(e) >= depth &&...
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Creating or editing shredder .bkt opening book
I want to create an opening book for Shredder or edit an existing one. the way I want it is like how Lucas chess works, giving a certain value (weight, percentage, etc) to a specific move. This is an ...
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My engine's alpha-beta search returns negative score eval. on odd depths and positive on even. Dont understand what is causing this bug
I've been working on implementing/improving my engine's search function the past few days, but yesterday I decided my current search implementation was a mess and that it would be much better to ...
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Is this a possibly faster way to find pinned pieces using magic hash?
Okay so this is something that I came up with while working on my own engine, but I am not sure if anyone has ever tried. Basically I am using a separate set of magic hashed longs to store pieces and ...
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Clear Stockfish hash table after every move conveniently
When analyzing a game with Stockfish I sometimes find it confusing that evaluation of a given position changes depending on what positions I had analyzed previously. I understand that this is because ...
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Why is futility pruning causing an Elo drop in my engine?
I'm getting weird results when introducing futility pruning into Blunder. On the one hand, I'm getting a pretty sizeable reduction in nodes, and I'm searching a full ply deeper for some positions (e.g....
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Relation between Elo and search depth for basic minimax
If we use the most basic approach to a chess engine (for example, for a codegolf): minimax to a fixed depth with the material count as static evaluation, then how strong is this algorithm?
This of ...
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Transposition table produces diffrent and wrong search results
I am currently developing my own chess engine in rust. It all was working pretty fine, until I added transposition tables. Where my engine was playing the reasonable move e2e4 at a lower depth, with ...
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How to install an engine to Arena chess GUI and play with personality?
As a beginner chess player I'm in love with chess.com personality bots, but free bots are limited, so I found this Rodent 3 engine but I don't quite understand how to use their unique personality to ...
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Engine for Pawn Sideways Chess
Is there an engine that plays the variant described by DeepMind in which pawns have additional sideways moves in addition to their regular moves? Fairy-Stockfish does not yet support this variant.
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Scid vs. PC: a hint needed
I have now installed Scid vs. PC and I have made my first move with White with 1. e4. Now the engine computes the position tree. How can I stop it and make it move with Black after some fixed time ?
...
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How to validate chess moves with a server? Winboard and Unity 2020.3
I'm looking for advice on how to implement online chess move validation using a winboard chess engine. I am creating a mobile battle chess game in Unity 2020.3. Right now I have the possible moves for ...
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Where to find a list of the computer stored in the FICS Games Database?
According to the FICS Games Database there are currently 1,525 "computers stored". Such accounts are indicated by a "(C)" after the username. However, this suffix does not seem to be recorded in the ...
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