What did Fischer mean by pre arrangement

Fischer said chess at the highest level is a lot of memorization and pre arrangement. What is the meaning of pre arrangement

The only thing I can see is that they could choose who would play Fischer by prearranging draws, but if he was prepared he could play any of them. Before Fischer's time, they said Keres threw games to Botvinnik. So, maybe his allegation stems from that.

As far as memorization, that's part of the game. He might have been right, but we have yet to memorize all permutations.

Then after that, it's retaining what you remember. Memorizing is the planning stage which is ironic because that is what feeds prearrangement. We have seen countless examples of players not retaining what they used to in earlier years. 

You have to make a decision, do you want to play chess or variants of chess where calculation is the key, or do you want to focus on pattern recognition?

Ok,but I think he meant pre arrangement in terms of opening setups.

That would be memorization. Pre-arranged refers to players agreeing beforehand what to play. Fischer argued that Karpov and Kasparov prearranged the 84-85 WCC.

Check out this thread.

https://www.chess.com/forum/view/general/fischer-says-karpov-vs-kasparov-were-fake-games-it-could-be-trust 

If I remember correctly he said they copied a game from his back in maybe early 70's. It had something like a bishop on f5 and the position wasn't exactly the same but it was close enough to him to argue the moves would be essentially the same.

pre-arrangement just means it's all planned before hand. He's talking about openings and how they have been developed so that they provide the most useful position for the player in any given opening, and how these openings are constantly built upon through theory and study to make them more and more solid. that's what he meant when he's talking about memorization and pre-planning, it's a reference to the dull way at the top level chess openings are pretty much so concretely explored that you could almost reach a drawn endgame from a specific opening. 

You can't pre-arrange moves unless your opponent is part of the arranging.