16
Of course there's a way: I'm going to show you one way of doing it on your own, using only free software. We'll write a small script in Python (I'm using v2.7) and only use the wonderful python-chess library (licensed under GPL3, note that I'm using the version 0.14.0).
In short, the script will first load up the engine, we will stick to free and open ...
12
Stockfish assumes that all FEN positions you feed it are legal positions. If you feed it an illegal position and ask it to evaluate it, it will likely crash:
Stockfish 5 64 by Tord Romstad, Marco Costalba and Joona Kiiski
position fen 4k3/4p3/8/8/8/8/8/3KP3
go depth 14
Segmentation fault: 11
But you could use a Python library such as Chessnut to validate ...
11
Easy question. Announce your engine on the chess programming forum (http://talkchess.com/forum/index.php). There'll be engine testers adding your engine to their rating list, such as CCRL. But please and please provide a working compiled binary.
Announce your engine, upload a compiled binary to somewhere like Dropbox. You'll hear feedback.
EDIT
cutechess ...
11
Let's use Stockfish to find out the moves for this position
[fen "N7/P3pk1p/3p2p1/r4p2/8/4b2B/4P1KP/1R6 w - - 0 34"]
The FEN string is: "N7/P3pk1p/3p2p1/r4p2/8/4b2B/4P1KP/1R6 w - - 0 34". You should copy-and-paste my commands to experience yourself.
Load the position by "position fen ..." and then use "d" to print the position. Please note that "d" is a ...
7
UCI chess engines don't offer/accept a draw, nor resign a position. This is the GUI's responsibility.
You are welcome to add new uci options (setoption and option) for your engine, but don't expect universe UCI support.
7
Because Black is to move, and for Black the position is evaluated as being 42.76 pawns behind.
7
Since your engine supports UCI, I would suggest checking out lichess.org. You can make a BOT account there and test against several other BOTs and people as well! Also, you can get your BOT rated in different time formats!!
I must warn you that most of the BOTs on lichess some version of StockFish or other strong engine but you can find ample other BOTs.
...
6
Stockfish is an engine that's called by apps that read PGN files, it doesn't read the PGN data itself.
There are many very good free apps that can read PGN files and analyse the games they contain using Stockfish (which is also free) and/or similar engines (mostly not free)
A lot of good free PGN reader apps that are able to call Stockfish can be ...
6
First the GUI sends the position string with the ponder move as the last move in this string. Then the GUI sends "go ponder". This makes little sense to me, but UCI is very much a kludge. Note that the engine can actually ponder whatever move(s) it wants, but UCI tried to make it simple for basic implementations. From the protocol
ponder
start searching in ...
5
The answer is NO. The stockfish engine does not have a concept of a chessboard state. Each position should be completely described through FEN notation. If you want to make a move, you then again describe the complete position and append your moves all in one command string then press ENTER on the keyboard. The engine does not remember the current position ...
5
Implement UCI or Winboard protocol (just enough to play games). Download some engines (e.g. via CCRL) stronger than your estimate and run a Gauntlet tournament in Arena/Winboard/Cutechess etc. Hundreds of games at least. Feed the resulting PGN output file into Ordo and it'll give you an ELO (for the time control you used). Try different time controls etc ...
5
It's the score of the current position, but it is computed by static evaluation (i.e. counting pieces, pawns, pawn structure, king safety, mobility, etc.) of positions arising in the program's search tree, and applying the minimax algorithm and alpha-beta pruning.
A cp-score of 6000 does indeed mean the engine thinks White is 60 pawns (centi means 1/100) = ...
4
No. Stockfish is an engine not GUI, it doesn't know or understand PGN. The bigger problem is why would you do that? Why would you want to use an engine on a PGN game? This is like giving a calculator your math exam and hope it'll give out answers magically. Please rethink why you would want to do this.
4
At the end of the line Remove Kibitzer, there is "UCI" written in red. Click on that.
4
Solution: Use 'expect' script as shown below. Tested with stockfish_8_x64_modern.
BlindKungFuMaster: "I think the main problem is that the uci protocol is a dialog."
I agree!
#!/usr/bin/expect
spawn ~/stockfish_8_x64_modern
expect -timeout 1000 Linscott
send "setoption name Ponder value false \r isready \r"
expect -timeout 1000 readyok
send ...
4
Unfortunately the UCI protocol is stateless, there is no way to ask the engine to undo a move. The protocol is designed for communication between GUI and engine, you are supposed to have your own board representation such that you can update the engine.
For example, you would need to do:
position startpos moves e4c5
position startpos
4
Yes, Arena can do what you want.
Download Arena 3.5
http://www.playwitharena.com/?Download
Adding Komodo (or any other engine) to Arena:
On the menu select Engines -> Manage
Open the Details tab
Click the new button
Point it at the executable
Select Ok
If you want it to play itself from a certain position you can set up an
engine tournament using an epd ...
4
The reason is very simple:
position startpos moves e2e4 d7d6 d2d4 e7e6 g1f3 c8d7 f1d3 h7h6 e1g1 c7c5 f1e1 e8f8
This is invalid. The position before e8f8 is:
e8f8 is invalid because Black has a bishop on f8. Stockfish can't play the move, so it just skip it.
To Stockfish, the diagram position is the position it's thinking. The best move is ...cxd4.
4
Look at the source code:
https://github.com/official-stockfish/Stockfish/blob/master/src/uci.cpp
// Additional custom non-UCI commands, mainly for debugging
else if (token == "flip") pos.flip();
else if (token == "bench") bench(pos, is, states);
else if (token == "d") sync_cout << pos << sync_endl;
else if (...
4
I have created this gist which is the best documentation I could find - most links I found where dead
https://gist.github.com/aliostad/f4470274f39d29b788c1b09519e67372
4
The only purpose of the "Ponder" UCI option in Stockfish is to inform the engine about that you will use pondering so that it can consider this fact in its time management, as can be seen in https://github.com/official-stockfish/Stockfish/blob/46ce245763705c89dba60dcfda549dc1f64eb48b/src/timeman.cpp#L131-L132:
if (Options["Ponder"])
optimumTime += ...
4
From reading various chess source codes, mostly before 2005, I can state that most don't a FEN output. Any that would allow for a non-starting position should accept FEN, as it's just a special form of PGN.
Crafty and san_kit both have a "fen" command.
4
info depth 1 seldepth 1 multipv 1 score cp 539 nodes 83 nps 41500 tbhits 0 time 2 pv e5f6 info depth 2 seldepth 2 multipv 1 score cp 790 nodes 182 nps 91000 tbhits 0 time 2 pv e4d5 b7b6 e5f6
obviously doesn't have any best move in it. Stockfish needs time to give you a move. Your program will need to filter out those principal variation lines.
Please don't ...
3
I use ChessPartner 6.0.4.3
r.click in the Internet Console and choose Properties
Autoseek Cmd:
getgame\n
Login script:
set chanoff 1
set silence 1
set tell 0
set formula !computer & !abuser
set notakeback 1
set tolerance 0
set autoflag 1
set style 12
3
xboard is not a UCI user interface, so you'll need to install the Polyglot adapter to make it work. Once you have the Polyglot installed, you'll need to edit the polyglot.ini file. Read here for instructions on how to do it.
Please note Polyglot is not a very professionally made software. You'll only be able to find some old documentation. The whole process ...
3
You can use icsDrone or Zippy with Winboard to connect an engine using the Winboard protocol to FICS. You can use PolyGlot as an adapter between Winboard and UCI protocols to connect your UCI engine to Winboard or icsDrone.
3
Follow my instructions in the screenshot.
3
lines info depth with score have something begining with pv, whereis the move. cp is centipawn, so evaluation is -4.82
info depth 16 seldepth 3 score cp -529 nodes 3409 nps 10299 time 331 multipv 1 pv b5c4 d3c4 d5b4 a1e1 h8e8 g3d6 d7b6 c4b4 e7d6 b4d6 e8e1 f3e1 c8b7 d6e 7 b6d7 e1d3 a8c8 e7g7 c8c7 g7h6 c6b5 d3e1 c7c8 h6e6 c8c1 e6d5 b7b6 d5d6
uci protocol
...
3
http://www.chessforums.org/general-chess-discussion/9079-chess-engine-output.html
It’s the “search depth.” It tells you how deep the search has gone.
The value is in “ply” or half-moves. The first number gives you the
“brute force” depth, the second is the depth to which certain critical
lines have been investigated. For instance a display of “depth ...
3
I don't think it's possible unless you recompile the source code. It's very easy to do it at the source code; you'll just need to add an if-statement just before the PV is printed.
Otherwise, you can pipe the outputs to a text file and do a grep like this:
grep 'depth 8' output.txt
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