How to Beat KataGo at 2 stones

 This was pretty exciting! I've had success beating KataGo at 3 stones using a strategy that focuses on creating a corner situation that it doesn't handle well. I thought I'd play around at 2 stones to see how close I could get, and I won!

KataGo will resign at move 153 if its algyrythm thinks it should, and I was in the middle of a battle, not keeping track of what move it was, and out of nowhere it resigned. Cool.

Here's the game:


The idea of 2 and 4 is to create a corner situation that KataGo doesn't handle well.


A few moves later, KataGo has invaded the corners. When B descends, the corner will be threatened, but KataGo does not defend the threat.


52 threatened the corner, but KataGo played 53, ignoring the threat. I was waiting for a good time to play 52, not wanting to do so before I had made my groups sufficiently strong to tenuki.


When 55 was played, I judged I could allow the separation of the two groups, as I though I would win the race to capture in the Lower Left (LL), hence I killed the group with 56.


When 71 was played, I tenukied to kill the UR corner with 72, as 71 wasn't filling a liberty of the LL group.


Instead of 100, playing 101 was also possible, which KataGo prefers, but it involves a ko, and I had read out B is one liberty ahead, so went with 100 and 102, which eliminates any ko.


These are the rest of the moves. I was engrossed in an unusual failed ladder sequence when out of nowhere KataGo resigned!

For context, here is the position a few moves earlier:


The ladder starting one move below 132 fails, but KataGo played it for quite a number of moves, which looks to be fine, as it got a nice position around the outside, but with all the cutting points, it's easy to connect the groups in the UR, and so B is way ahead in territory.

Looking at this some more, with KataGo's help, it looks like 105 was the losing move. It could have won by playing at 106 instead. Instead of 104, 106 would have been better, transposing into the game sequence.

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