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One thing chess engines are still bad at is determining which positions are difficult for humans to play. If there is a sequence of moves where Black has to mak

One thing chess engines are still bad at is determining which positions are difficult for humans to play. If there is a sequence of moves where Black has to make the right choice every time from several plausible alternatives to reach a drawn endgame, but White has plenty of margin for error at every turn to keep that situation, the computer will happily evaluate this as "0.0" - a draw. Solving this would allow handicapped computers to play interesting games against humans, and it would also be hugely useful for strong players preparing opening surprises, but no one seems to have figured it out. Note that this isn't a simple graph theory question of looking for how narrow a path through the graph is: the word "plausible" is very important above, and a narrow path where most moves can quickly be eliminated is one of the easier things for humans to calculate. Anyway, I was hoping this was a step towards solving that, but they don't seem to have even tried to apply it there.

somenameforme 2y ago
For sure, but I think this is really quite difficult even with the wildest of hand-waving. Take, for instance, take the R+B v R ending. The weaker side has literally two pieces, including the king, to move. There are many well studied drawing plans, and in most positions literally any move would lead to a draw (short of absurd things like hanging your rook). Yet this ending is extremely difficult to the point that GMs lose it with some regularity. That stat about 40% of the possible positions being forced wins is useless, because it includes mostly very weird positions that nobody would voluntarily walk into. The overwhelming majority of times this ending is entered into, as well as normal moves from such, are all textbook draws.
- dmurray 2y ago
  > I think this is really quite difficult even with the wildest of hand-waving It's difficult for computers! But humans can do it. An 1800 armed with computer analysis (so he knows the right moves) can say with some confidence "this position looks difficult for a grandmaster".
  - somenameforme 2y ago
    I think an 1800 with computer analysis would never say R+B v R looks difficult for a GM without external knowledge of the fact that it is.
    - dmurray 2y ago
      It's hard to isolate the external knowledge. If R+B v R came up once every 50 games, every GM and probably every 2000 would know it inside out.
      - ANewFormation 2y ago
        There isn't a GM that hasn't studied RBvB, and most have also played numerous games with it. But it's just very difficult to execute properly. Let a 2000 go study it for weeks - he'd still lose it against strong play. People often see chess as just a game of knowledge, but in practice it's much more like a skill in that for a strong player they'll generally see the right move(s) in a position near instantly. The time spent is then just comparing and double checking stuff. This is why you might see in e.g. a press conference some journalist ask why the player didn't play 34. Ne5, and they'll think for a few seconds, go ooooo wow as they rapidly work out the [invariably computer generated] idea, and then respond that they simply didn't consider it. This is how players like Magnus are so strong and why the time control doesn't really matter - his intuition just tends to quickly lead him to better ideas than for other players.
        dmurray 2y ago
        > But it's just very difficult to execute properly. Let a 2000 go study it for weeks - he'd still lose it against strong play I don't agree. People lose this one because they haven't looked at it recently. I would be willing to take this as a bet. Train with the computer for weeks, and then I get to defend the endgame against a computer or a tricky human. (I'm a bit stronger than 2000 but I could find someone else).
        2y ago

somenameforme 2y ago

For sure, but I think this is really quite difficult even with the wildest of hand-waving. Take, for instance, take the R+B v R ending. The weaker side has literally two pieces, including the king, to move. There are many well studied drawing plans, and in most positions literally any move would lead to a draw (short of absurd things like hanging your rook). Yet this ending is extremely difficult to the point that GMs lose it with some regularity. That stat about 40% of the possible positions being forced wins is useless, because it includes mostly very weird positions that nobody would voluntarily walk into. The overwhelming majority of times this ending is entered into, as well as normal moves from such, are all textbook draws.

dmurray 2y ago
> I think this is really quite difficult even with the wildest of hand-waving It's difficult for computers! But humans can do it. An 1800 armed with computer analysis (so he knows the right moves) can say with some confidence "this position looks difficult for a grandmaster".
- somenameforme 2y ago
  I think an 1800 with computer analysis would never say R+B v R looks difficult for a GM without external knowledge of the fact that it is.
  - dmurray 2y ago
    It's hard to isolate the external knowledge. If R+B v R came up once every 50 games, every GM and probably every 2000 would know it inside out.
    - ANewFormation 2y ago
      There isn't a GM that hasn't studied RBvB, and most have also played numerous games with it. But it's just very difficult to execute properly. Let a 2000 go study it for weeks - he'd still lose it against strong play. People often see chess as just a game of knowledge, but in practice it's much more like a skill in that for a strong player they'll generally see the right move(s) in a position near instantly. The time spent is then just comparing and double checking stuff. This is why you might see in e.g. a press conference some journalist ask why the player didn't play 34. Ne5, and they'll think for a few seconds, go ooooo wow as they rapidly work out the [invariably computer generated] idea, and then respond that they simply didn't consider it. This is how players like Magnus are so strong and why the time control doesn't really matter - his intuition just tends to quickly lead him to better ideas than for other players.
      - dmurray 2y ago
        > But it's just very difficult to execute properly. Let a 2000 go study it for weeks - he'd still lose it against strong play I don't agree. People lose this one because they haven't looked at it recently. I would be willing to take this as a bet. Train with the computer for weeks, and then I get to defend the endgame against a computer or a tricky human. (I'm a bit stronger than 2000 but I could find someone else).
        2y ago