internal bool Exists(Move move, Field near, Field far)
{
bool result = false;
if (move.Hash == 0)
{
if (!CanMove(near, far))
throw new InvalidOperationException();
{
Use();
near.Free();
far.Free();
}
result = move.Update(board);
{
Free();
near.Use();
far.Use();
}
return result;
}
return board.Exists(move.Hash);
}
internal bool UndoMove(Move move, Field near, Field far)
{
if (!CanUndoMove(near, far)) return false;
if (Free() && near.Use() && far.Use())
{
board.UndoMove(this, near, far, move);
return true;
}
return false;
}