EXE files should not be in the repository with the source, usually we put it in "release" section.

Thank you.

From version 2.2, amoeba does not communicate with ChessGui under Windows, nor with Cutechess-cli under linux. It seems to work well with some GUI (Arena, xboard).

Hi, not much of a D guy here, but I can't build on Ubuntu 16.10 with the repo compilers, gdc simply segfaults (I was very impressed by that!), while ldc:

ldc2 -O3 -release -boundscheck=off -singleobj -w -dw amoeba.d util.d board.d eval.d kpk.d move.d search.d uci.d weight.d
/usr/bin/ld: amoeba.o: relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: Nonrepresentable section on output
collect2: error: ld returned 1 exit status
Error: /usr/bin/gcc failed with status: 1
Makefile:79: recipe for target 'build' failed

I couldn't build even without the "fast" target, is there any obvious fix here?

Thanks!

while testing in CuteChess, Amoeba v3.3.1 (which i compiled on Linux 64 bit) plays a strange move which lost a piece :

Rd1 after 6.3 seconds ?! What happened ? In 1 other game Amoeba had the same issue, suddenly giving a Rook ..

amoeba-3.4 may appear as a malware according to some antivirus. Windows defender falsely identifies it as Trojan:Win32/Wacatac.B!ml on some of my computers. Look at microsoft support for a solution to enable the chess engine back.

Est-ce que l´édition du quatrième février 2017 une version officielle? Pour ça j´ai une demande de renseignements présente en langue anglaise (ComputerChess Wiki)

May you compile a Windows version too, please?

Thanx,
Alex

First I want to say that postmortem is an amazing tool! Thanks!
I wanted to give it a larger hash size (between 16 and 24 G) as my workstation has plenty of RAM, but then it runs forever... Without the -H it works fine.

Just wondering if this bit of code in util.d is correct?

/* Get the first bit set */
version (LDC) int firstBit(ulong b) {return cast (int) llvm_cttz(b, true);}
else version (GDC) alias firstBit = __builtin_ctz;
else alias firstBit = bsf;

/* Get the last bit set */
version (GDC) alias firstBit = __builtin_clz;
else alias lastBit = bsr;

The second to last line resets firstBit and doesn't actually set lastBit for GDC. Seems off to me :)

May not affect much as it seems to only be used to resize tables, but it may affect accuracy, if used in the future I suppose.

Hello Mr/Mrs,
I installed Amoeba 3.0 in ChessGUI chess GUI (http://www.chess.hylogic.de/), but Amoeba uses 1 Thread only.
Thanks.

i'm on Xubuntu 20.04.2 and i have this error :

$ make
ldc2 -singleobj -w -dw -mcpu=native -dip25 -preview=intpromote -O -release -boundscheck=off -flto=full --frame-pointer=none -d-version=withPopCount -mattr=+sse4.2,+popcnt amoeba.d board.d eval.d kpk.d move.d search.d tt.d uci.d util.d weight.d
Intrinsic name not mangled correctly for type arguments! Should be: llvm.prefetch.p0i8
void (i8*, i32, i32, i32)* @llvm.prefetch
in function _D4util8prefetchFPvZv
LLVM ERROR: Broken function found, compilation aborted!
make: *** [Makefile:89: amoeba] Error 1

Not sure this is a bug or not, but I have noticed slight difference at how amoeba reports evaluation compared to Stockfish and Fire (Anscacs for an example behaves like Amoeba - it gives positive evaluations).

When you do MultiPV of say 4 and position startpos moves g2g4 for an example, amoeba gives positive evaluation of typically 70+ centipawns. However, the abovementioned engines will report -70+ centipawns.

Is this a potential bug or not?

Hi, I would like to use your engine to test different chess algorithm ideas I have.

Could you explain where are the key points to hook in to and what the algorithm needs to do?

The algorithm will most likely need to be ran before the built in algorithms and use it's own search space techniques.

I would like to replace the entire engine temporarily then eventually try to use it has a heuristic for my own algorithms. But I would like to use all the machinery you have developed(UCI, etc) to make it easier for me to develop. I would like to focus on the algorithm itself rather than learning the structure of the app(at this point).

e.g., how could I replace your engine with one that simply makes valid random moves? (or even invalid moves the valid move code in your engine cannot be used independently).

Thanks!

I'm trying to compile Amoeba on Raspberry Pi 3 (running Raspbian Linux) using gdc. This is the command I'm using to compile:

amoeba-master/src $ gdc -o amoeba *.d

And this is the output -- only these three messages and no binary:

board.d:750: error: found '(' when expecting '.' following ulong
board.d:750: error: found ')' when expecting ';' following return statement
board.d:750: error: found '<<' instead of statement