OpenChess

From Jury Osipov:

About copying, rewriting of code and so on. In eval-function of Ivanhoe we can find:

Code: Select all

  U = (POSITION->OccupiedBW >> 8) & wBitboardP;
  while (U)
    {
      b = BSF (U);
      MobValue -= PawnAntiMobility;
      BitClear (b, U);
    }

Robert Houdart replace this at:

Code: Select all

  U = (POSITION->OccupiedBW >> 8) & wBitboardP;
  MobValue -= popcnt(U) * PawnAntiMobility;

Is it plagiarism?

No, I'd guess it's the IPPOLIT/IvanHoe crew failing to note this "obvious" improvement (multiplication rather than repeated addition) once they ditched the Rybka 3 method, where "PawnAntiMobility" can depend on the square in question (R3 also has some pawn mobility bonuses for pawns on the opposite side of the board of the opposing King).