Questions tagged [programming]

Questions related to all aspects of writing software related to chess.

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5
votes
3answers
3k views

What is the optimal way to use Stockfish programmatically?

I have Stockfish compiled on my machine. Instead of just running the Stockfish program in the terminal, is it possible to interact with it in a separate program? For example, some basic things I ...
17
votes
5answers
1k views

How did the engines improve since Deep Blue?

Computer chess engines have gotten better since Deep Blue beat Kasparov in 1997. Did the algorithms get better, or were the improvements mostly due to the same algorithms running faster thanks to ...
2
votes
1answer
108 views

How can I get multiple computer recommended lines in python-chess module?

In python-chess you can communicate with the engine on a given position. However the method presented in https://python-chess.readthedocs.io/en/latest/uci.html using the engine.go() function with only ...
4
votes
1answer
826 views

What is alternative to Zobrist hashing?

Zobrist hashing is very good method save position but it is not good to read position - is any good alternative to this algorithm which allow to store and restore position with minimum of bits. For ...
4
votes
2answers
227 views

What's the rationale behind chess engines conditionally allowing threefold repetitions when assigning a draw score?

When a chess engine sees a position p repeated once (i.e. position p occurred twice) it immediately assigns the second occurrence of position p a draw score. This makes sense because position p doesn'...
2
votes
1answer
201 views

Is this the correct flow of a chess game?

I am trying to program a chess game as a challenge to myself, however, I am unsure if I have all the moves correct to play a legal game (not any advanced moves, that would be a challenge for another ...
1
vote
2answers
206 views

Android Stockfish communication works differently than on PC? [closed]

How is number of threads to use written on Android versions of Stockfish? Whole communication works but somehow I still can't change number of threads. I even have working code for PC version of ...
1
vote
0answers
47 views

Chess engine used to point out common tactical blunders [duplicate]

Does anyone know of chess engines that have been programmed to point out a tactical blunder in plain English? I.e. “you missed a skewer”, or something to that effect. Not simply “this move -3”. ...
4
votes
1answer
468 views

Four player chess (team): is there some opening theory written somewhere?

I am an active player on four player team chess on chess.com (my Elo is currently 2095). I am planning to write something about theory of opening of this chess variant. Question is, do you know if ...
3
votes
2answers
368 views

Is there a free downloadable mini-chess program or 'chess engine'?

The fascinating miniature chess or mini-chess ' that is chess on a 6 by 6 board. I know there are tons of decent chess programs but has anyone written a decent chess program for mini-chess. Is there ...
1
vote
2answers
100 views

Can an Optimal Stopping strategy be applied to search functions?

Can the solution to the famous Secretary Problem be applied to the search function of a chess engine? Rejecting the first 37% moves and choosing the best one after that,or maybe even just checking the ...
10
votes
5answers
14k views

Chess engine with API

I am looking for a chess engine which provides a normal API which I can use with some high level programming language like C# or python. I went through the list of leaders (Houdini, Komodo, Stockfish ...
2
votes
3answers
465 views

Duplicating the game analysis output on lichess

I'd like to automatically generate move by move analysis (based on my past games) like they have on lichess for imported games. My guess is that I need to run a full stockfish analysis for each move (...
0
votes
1answer
123 views

Is there a way to get MANY and FAST (but not deep) position evaluations in javascript?

I am working on a statistical chess project that needs to evaluate many (about 20-30) different positions per turn. They do not need to be deep but fast. Is there a possibility to use engines (...
4
votes
1answer
159 views

Standard for receiving live chess broadcast

I was making live broadcast recent days and I'm quite surprised how it technically worked. We were downloading whole new PGN file every 5 seconds with format shown it the code below. Is this how ...
0
votes
1answer
133 views

convert stockfish pv output to show piece names [duplicate]

What are suggested coding snippets to add pieces to pure algebraic notation (this would change g1f3 to Nf3) when using the chess.js and chessboard.js (javascript) interface. Stockfish uses this type ...
2
votes
3answers
289 views

FEN inverter website/page?

This board shows the black pieces on the bottom, but the white pieces are supposed to be there; I accidentally set up the board so that white's pieces are on the black side. I am looking to flip the ...
7
votes
4answers
329 views

Checkless Chess

Is there any material difference between chess the way it is now versus doing away with check and checkmate and defining victory as simply capturing the opponent's King? Assuming an available King ...
5
votes
2answers
2k views

Chess GUI that allows null-moves

Is there a GUI that allows null-moves as legal moves? Of course for engines the null-move heuristic already is an established technique.
4
votes
1answer
189 views

Output whether the best move is “much better” or only “slightly better” than the other moves

On Oct 31, 2014, Tord Romstad wrote: The moves are not searched in descending order from best to worst. Stockfish has no idea which move is the second, third best, etc., and it doesn't have any ...
7
votes
2answers
526 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 ...
3
votes
2answers
109 views

Coordinate-style move output from chess engine, to control robot

I'm using gnuchess to decide which move a program should make, and I'm using its output to control a robot arm (to execute the move on a real board). However, gnuchess outputs SAN (Standard Algebraic ...
3
votes
1answer
142 views

Data set of board representations at checkmate?

I would like to do a simple project by looking at the pieces at play when checkmate occurs. I have been scouring the internet for a dataset of standard chess games from which I can retrieve the ...
6
votes
4answers
313 views

Formulating a Precise Definition of “Space” in Chess

Premise I have always enjoyed playing recreational chess, so I know the basics and some general tactics / strategies. It was only recently though that I have gone more hardcore, so to speak, with my ...
9
votes
3answers
816 views

Unit Testing a chess board representation

So this is a bit of outlier question. I am writing a chess library, essentially from scratch. You can find much of the code here, with the intention of using it for a GUI and/or an engine. (The game ...
8
votes
3answers
2k views

Which interface protocol should I implement for my chess engine?

I am writing a chess engine in C++ https://github.com/RomainGoussault/Deepov. I know there are several interface protocols out there (UCI, Winboard protocol, etc) and I don't know which to implement. ...
4
votes
2answers
958 views

How to generate hash keys for chess positions

Is there a standardized method for generation of hash keys for chess positions. I want to implement hash key generation in my program, so wanted to know the best way to do it. It would be great if ...
1
vote
3answers
357 views

Make Arena send last move to chess engine

I am building a chess engine using AI and have succesfully connected it to the Arena Gui, by implementing the UCI protocol. My goal is to train my AI by facing other AIs that Arena offers. Everything ...
0
votes
2answers
185 views

Please critique my Engine game

Two of my engine's played against Garbo engine. (without a opening Book on my part.) Both lost :( Which played better? I need a comparative analysis. Both shared the same evaluation. frankenstein ...
1
vote
3answers
200 views

Python-chess is_zeroing and is_capture operation outputs

I'm using python-chess to analyze a game. I have my code like this, and I expect 3 boolean outputs. print("is_castling: " + unicode(board.is_castling(node.move))); print("is_zeroing: " + unicode(...
3
votes
1answer
465 views

Differences between chess engines

In what way do major chess engines differ from one another? Do they all use the same algorithm and the same evaluation function, differing only in parameters/weights?
1
vote
2answers
77 views

Changing UCI output to include piece names

UCI output from engines is generally raw in the form of g1f3 and e2e4 representing Nf3 and Pe4. One engine I saw (lozza) sends its PV output with the piece names. Others, like Stockfish, don't ...
4
votes
1answer
175 views

Backwards Chess Program

Is there a chess program where you can create a position and the program creates a game, expecting the best possible moves to get there, or the most common? A problem I would see is some positions ...
4
votes
1answer
346 views

How to iterate over all FENs in Syzygy table?

This is a programming question related to chess syzygy endgame tables. I believe that it is better suited on chess stack exchange than on SO because it is too specific to chess and asks for a ...
3
votes
2answers
356 views

How to write a simple chess engine to statically evaluate a position?

I want to evaluate positions statically. So I've written a code which evaluates from a FEN string. However it is a tedious to copy FEN and then paste for a complete game. So I wanted to know if it ...
1
vote
1answer
97 views

Getting started in position-counting by computer

I have quite a bit of programming background, and even game programming background, but have never looked at a real chess engine before. I recently stumbled on this puzzle-question, which asks for ...
1
vote
2answers
425 views

How do I get Stockfish to show notes like it does on Lichess?

I want to write a program to stop a chess game if Stockfish decides that checkmate is unavoidable for a player as a learning exercise. I downloaded Stockfish for Mac and it gives what it thinks is the ...
1
vote
1answer
72 views

Possible chess positon after X ply?

I've started to code my own little engine recently and am now working on a perft function which simply sees how many moves there are. Trying to get correct results I searched online for the correct ...
2
votes
1answer
304 views

Estimating probability of player playing move in the opening

For position you never played, book probability is perfectly fine for me. The question starts when you already played position x-times. I'm looking for function that will update book probabilities ...
1
vote
1answer
659 views

What is the problem with my negamax implementation?

I am currently attempting to make a basic chess engine in Python (Learning some basic concepts), but for some reason the engine is suicidal and does not detect the scholars mate. I am using python-...
8
votes
1answer
3k views

Stockfish evaluation of a position from PGN

I am trying to get Stockfish's evaluation of a board position(which is in PGN format) using command line.I know it accepts board position in FEN format, but is there any way i can provide PGN format? ...
8
votes
2answers
2k views

Where can I find databases of tactical problems, categorized and ranked by difficulty?

I'm toying with the idea of building a tactical training tool. For my idea to work, I need positions that are categorized by motif and difficulty. A lot of tools seem to have this, and I doubt they'...
2
votes
1answer
611 views

How are centipawns calculated?

I found on the Web some information what centipawns are. But how exactly programs calculate this loss? How can I recognize if one move will bring less centipawn loss that an another? Assuming both ...
3
votes
3answers
2k views

How to send uci messages from c# app to stockfish on android?

I downloaded the binary of Android Stockfish arm64-v8a and looked in the CPP source files. In main() there is all initialization, and then there is UCI::loop(), which catches standard input with ...
3
votes
1answer
298 views

Gull engine : Which depth value to set 6 difficulty levels?

We are installing the Gull engine for some chess enthusiasts in an organization. We would like to set 6 difficulty levels from beginner to master using depth. Is there someone who can advice us about ...
4
votes
1answer
497 views

Using Stockfish in c# android (xamarin) app

I looked at this question Implement a chess app for Android with Stockfish but it doesn't seem to be answering what I want to ask. Maybe part of my question is topic for stack overflow forum, but ...
1
vote
3answers
321 views

Chess Psychology

I have a friend who is an improving chess player. He wants to progress in his game. The problem with him is that he plays really good with much stronger opponents but, often lose many games ...
2
votes
2answers
132 views

Analysing Positions in Databases with a program

I've got two questions. I'm wondering if: It is possible to search for certain positions in a database (like Chessbase) and display all of them in a text file. To be able to assign a score to each ...
6
votes
0answers
195 views

Are there any dicylic graphing programs for chess? [closed]

Although chess is frequently thought of as a tree structure, it is not because positions can be arrived at through different move orders and moves can be repeated. Are their graphing programs/...
-1
votes
3answers
1k views

My chess AI makes the same repeated moves

I've built a chess game engine using Minimax and when I play AI against the AI, everything goes fine(for sometime) until both the AI players make the same set of moves again and again. Observe the ...