# Potential rank inflation on OGS or How To Beat KataGo With One Simple Trick (free)!

This makes me wonder if it has to do with cycles in the boundaries, rather than cycles in the stones: the problematic groups have two long cyclic boundaries.

I would guess a single point eye or a small eye is easy to “perceive” locally via the cooperation of at most a few layers, so the neural net will have an easy time implementing a hack for that. Imagine you were looking at the board with a magnifying glass super zoomed in unable to see most of the board at a time, instead having to manually scroll your viewpoint around. It would still be easy to perceive small cycles (eyes). But sufficiently large enough cycles would be hard to perceive. It would look locally at any given spot exactly like like any normal non-cyclic dragon that is bordered by opponent’s stones. So there is an expectation that for a sufficiently large cycle, the neural net’s algorithm will probably behave locally about the same as if it wasn’t a cycle.

And so if that algorithm is "locally this group has a branch that extends north and is reporting 8 liberties so far from that direction, and it has a branch that extends south that is also reporting 8 liberties from that direction, therefore I should add 8+8 and behave as if I have 16 liberties, that’s usually fine, unless those 8 liberties from each branch are actually the same 8 liberties double-counted because the two branches connect back around to each other in a loop way outside the radius of easy perception.

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And here is it: the rank inflation I warned you about. Contained, for now, as it is an experiment, but for how long…?

User, who mastered the approach: fallingsnow88

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and no one is going to fix Leela Zero or ELF

Pro accounts on OGS can play ranked games with normal user. Then rank of normal user changes, but rank of pro account does not. Same should be done to bots. Rank of human should not change if they play bot. So we at least will have accurate human ranks.

For years already exploits are known for many bots. It’s just that KataGo seemed to be more immune against it until recently.
I suppose that experimenting to confirm some exploit is acceptable, especially when those games are unranked. However, using some exploit over and over in ranked games comes down to rank manipulation, which is not allowed on OGS.

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IIRC the argument has been made before that ranked games against bots serve a purpose: they help new players on OGS to get a rank, because many established players avoid players with a provisional rank.
So maybe this proposal of making bot games unranked should only apply to players who have an established rank (this proposal and the amendment has also come up before IIRC).

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The one-eye high liberty case continues to be the hardest to learn when the group is large. Value function very gradually changing in that case (depending on the size of the group, larger is harder to “perceive”), able now to detect this move as maybe letting black win, when a few weeks ago it wouldn’t consider black to have a large chance to win even after playing this cut.

Cutting here is not really part of the policy yet, very tiny %, so this move wouldn’t be seen if deeper in the search, it needs to be learned now that the value function is enough to decide it as good. So continues the back and forth between policy and value learning, each one enabling the other to progress.

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very long circle

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making (ranked games of human vs bot) (ranked for bot or provisional human) but (unranked for human with an established rank) would be good
currently there are humans that play only with bots and believe their rank after that. I guess (sdk vs bots) may be actually (ddk vs humans). Hopefully more people would try to play with people with such limitation.

While I agree with you that it is good to encourage more human-human games, if someone wants to play ranked games against bots, is that really such a bad thing? After all if they play honest games, why shouldn’t it count as ranked?

It feels like a needless limiting of options to me, and in contradiction to the OGS cockpit design ethos.