thank you, this is pretty much what I was trying to say. Especially the narratives part. there are plenty of instances of humans finding winning moves in positions that the computer did not 'see' the advantage of until after it was played. That doesnt happen because the human saw more moves ahead than the computer. It happens based on work done building a generalized intuition about the game itself which i would argue extends beyond what would be expected from "pruning" algorithms.
If a computer could assess every single move, it would. A human would still prefer to rely on narratives and game sense if it's good enough
I'd argue that if the human sees a line that the computer didn't see any advantage of at all, then the engine is just wrong.
The more likely outcome if the engine is 'correct' is that it sees the line but thinks an alternative one offers a much greater advantage.
The computer can't condition this information on what you or the opponent is likely to do though. For example, there are lines of play that an engine can generate where you can checkmate in 60+ (even examples where the number goes into the hundreds) moves but only if you play every move absolutely perfectly, this kind of strategy is very brittle, a human might make adjustments to preserve the general idea of the line of play but make it more robust to error. The engine might also generate lines of play that have one or two flaws, but the engine thinks it's very unlikely that the opponent will find those flaws, because the population of games in it's database tells it that very few opponents see them. As the human you might see that your opponent is taking a certain line of play to try and get some sort of positional advantage, and that they are more likely to see the flaw in the engines line of play because the goals are in direct opposition to each other, in this case you would not choose this line because the computer is unable to condition its lines of play on the quality of your opponent.
IMO this is the fundamental reason chess masters around the world don't feel threatened by the computers yet. The way computers play chess relies on past information, often this past information is generated by humans. Humans are also able to generalise the insights that engines can find creating more robust strategies that are hard for engines to beat, until the engine adds it to the database.
>The more likely outcome if the engine is 'correct' is that it sees the line but thinks an alternative one offers a much greater advantage
No I mean it literally does not see the advantage until after the move is played and it runs depth on the new position. then if you "undo" the move, the engine will now assert it as the best move instead of its previous recommendation (thanks to its cache). It is a very rare occurrence, but Ive seen it happen watching analyses of top games.
another similar thing is that engines aren't that great at detecting "fortresses". So a position that is a draw might be evaluated as an advantage for the attacking side, even though there is no successful attack available. technically the attacking side does have the advantage / more powerful position.. but since it cant be won it should be evaluated to 0. by evaluating it to +1 or similar, that might make the engine favor it over a +0.5 position where attacking chances still exist.
>The engine might also generate lines of play that have one or two flaws, but the engine thinks it's very unlikely that the opponent will find those flaws
do engines do this? this seems much closer to human strategies. In general I totally agree with the larger point that a mix of human and machine is the best combo.
>chess masters around the world don't feel threatened by the computers yet
what do you mean by this? If any master needed to play against stockfish for their life, I think they would feel overwhelmingly threatened. Or do you mean this strictly in the context of human + engine being better than just engine alone?
If a computer could assess every single move, it would. A human would still prefer to rely on narratives and game sense if it's good enough