Review requests [19k]

Throughout this game, I was looking for opportunities to invade, but could not find any (other than the bottom-left corner). Did I miss some opportunities or did I misplay the opening to not give myself any opportunities to invade?

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I also would like advice. I can’t tell why my move was bad here. Can someone explain? I was trying to stop him from making a wall. I’ve been memorizing openings, but evidently my intuition is really bad. I was white of course. I just can’t tell was this was such a horrendous move on my part. If it’s so bad it should be obvious. There must be an easy to explain reason.

From my limited understanding (stronger players, feel free to correct me):
L7 does not prevent him from making a wall because he can play K7 and your invading stone is trapped. The computer recommends L10 because that helps secure the corner so that even if he plays L7, the black group on the right may not have enough space to make two eyes.

The path to becoming a Beedrill will be a long one.

Ooooof, that is quite a complicated situation. To try and understand L10, we first need to identify strength’s and weaknesses of both players.

  • Black has a weak group around L6. It is weak because it only has a handfull of stones, is sorrounded by W stones from almost all sides and has no real eyes to speak of just yet. So at a first glance it would seem W has the upper hand
  • BUT W has a very scary weakness too. The diagonal connections at the top of the board are very problematic as B can either double atari (put two stones in atari with one move) at J10 or atari at K10 and then cut off the top K12 and K11 stones thus destroying a huge portions of W territory if B manages to kill those.

L10 then does two main things at once. Although some of it is just based on reading ability beyond our level, there are some basic concepts that apply too. First with L10 W is fixing some of the aformentioned weaknesses and making sure the upper left corner can survive safely (B can no longer atari K10 and attack the upper left corner). The proverb goes something like: “You cannot attack with a wet noodle” and indeed this the case. AI wants to make sure W is strong BEFORE trying to attack black. Otherwise Black can just cut White apart, and while W would probably manage to kill off the L6 stones, the cost of losing the whole top would be too great.

Secondly, W is at the same time limiting Black’s access to the corner, limiting his/her options to widen the base for Black’s stones. When trying to attack something severly, you need it contained to as small a space as possible so it would be hard (or impossible) to find enough room for two separate eyes.

But as far as I am concerned the main concept to take away from the position is: Fix your own problems first, then attack.

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@springyboard
I do not have too much time, so perhaps someone might chime in with a more thorough review, but some of my ideas here: https://online-go.com/review/493957

Overall, I would say you did NOT miss an opportunity to invade. The opening seemed quite balanced and both players took reasonable chunks of territory. I did not see a very viable opportunity to invade after the opening, nor would I seek one. What cost you the game was largely a bad endgame.

Many times you took a small gote sequence, while your opponent was taking slightly more. In (or near) endgame we have a pretty simple “rule” - SENTE MOVES FIRST. Whatever points (even small ones) that you can get “for free” are great. Especially the lower left corner was open for way too long. I did not mark it after every move, but I cannot stress enough, how big it was. It does not look like it, but corners are always big. It is like 4 points more for you and 4 points your opponent does not get instead and suddenly it is almost a 10 points difference IN SENTE for you. Not taking it is just bad :slight_smile:

So yeah, as far as I am concerned the main lesson here would be learning to work with sente.

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I made a much less thorough review than AdamR’s. In summary, I think the weakness of your middle right group made it harder to invade or reduce.