if (!world.isRemote)
        {
            Block block1 = world.getBlock(x, y, z);
            if (block1 == Blocks.furnace)
            {
                TileEntity tile = world.getTileEntity(x,y,z);
                TileEntityFurnace furn = (TileEntityFurnace)tile;

                ItemStack toBurn = furn.getStackInSlot(0);
                if (toBurn != null)
                {
                    ItemStack burnResult = FurnaceRecipes.smelting().getSmeltingResult(toBurn);

                    ItemStack currentResult = furn.getStackInSlot(2);

                    if (burnResult != null && (currentResult == null || currentResult.getUnlocalizedName() == burnResult.getUnlocalizedName()))
                    {
                        BlockFurnace.updateFurnaceBlockState(true, world, x, y, z);
                        furn.furnaceBurnTime = 400;
                    }