ChessKISS 1.8d bug fix version

Computer chess is a fascinating area to introduced bugs that are so difficult to catch.

In my mind it good a good idea to remove the king in order to improve the performance, but it turns out that in king confrontations it created a king mate...

function TChessboard.InCheck(aSide: TSide; out aPiece: TPiece): TCheck;

var

  king: TPiece;

begin

  king := GetKing(aSide);

  if king = NO_PIECE then

    Exit(checkUnknown);

  aPiece := GetPieceAbleToMoveToSquare(TUtils.Switch(aSide), TPieceHelper.GetIndex(king), actCapture, [ptPawn, ptKnight, ptBishop, ptRook, ptQueen]);

  if aPiece <> NO_PIECE then

    Exit(checkYes)

  else

    Exit(checkNo);

end;

I think I'm done for the time being, I want to focus on other projects.

Find the new binaries at OneDrive

ChessKISS 1.8c 22/02/22

I've three big TODO's left in this project:

• Use Gaviota endgame or similar.
• Bitboards in x-ray (soma parts of the engine still not use bitboards) since this is the method that consume the mode CPU
• Multi cpu, SMP?

what's new:

• Knight pair bonus was not taken into account
• Move generator for slice pieces is now done with bitboards 
• New board.IsDiscoverCheck()
• Now apertures are saved correctly
• Now captures take info from friendly blockers
• If evassion move is equal to hashmove then it is discarded
• Added Reverse futility pruning
• New pawn islands penalty
• When a command is not recogniced then no exception is thrown

Enjoy carnival!

Find the new binaries at OneDrive

ChessKISS 1.8b oh well, I could not resist it

Happy new year unknown visitor!

I found some more bugs (I'm sure there are more, but man they are so difficult to catch)

• Now Board.CanTraverse() uses bitboards 
• Now bishops and rooks can pin pieces and get some bonus
• Tropism values changed
• Aspiration Window sizes are now vectorized
• New TUtils.IsDiagonal()
• Board.IsRepetition() improved to match the sides for current play 
• Fixed some issues with mobility and x-rays

Find the new binaries at OneDrive