Could someone please review this game for me if they have time?
https://online-go.com/game/84433162
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Very briefly, you did well capturing those two groups at the top, way to go!
Your opening could have set you up for some trouble, because, by bumping up against another black stone with D7 on the second move, you are starting out with a very cramped space for yourself. Then when black attacks the group becomes heavy, and that L shape (which contains an empty triangle) doesn’t have many liberties or a lot of eyespace. If black had played more carefully in the corners it would have been hard to win.
Instead consider something like G6 for your second move and try to develop towards the bottom of the board.
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Two big mistakes:
At this point you captured the triangled stone. Your move was worse than passing because even if you play elsewhere, Black cannot save that stone (do you see why?). So better try to kill the squared stones.
Same problem. At this point you captured the three stones B6, but this was worse than passing since even if you play elsewhere, Black cannot save those stones (do you see why?).
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I thought that capturing stones in territory would get you two points (one for the captured, one for the empty intersection left) and leaving the stones would get you one point of territory. Is that wrong?
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It is theoretically correct. If you need to count the points, that is true. You get two points.
However if the stone you are capturing is already dead then you get those points at the end of the game without doing anything. Therefore if you spend a move for that case then all you did is:
a) Waste one move, as @jlt pointed out
and
b) Also lose one point, since you filled in one empty space with your stone.
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In this situation, Black’s stones are alive and White’s stone is dead. So Black gets 3 territory points (A1, B1, D1) and 1 prisoner (the stone B1), so 4 points overall.
Suppose Black captures the white stone:
Then Black has 2 territory points (B1 and D1) and 1 prisoner (the one that was removed from the board), so 3 points overall.
Conclusion: capturing the white stone is 1 point worse than passing.
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Giving your opponent the opportunity to play twice is very dramatic in go, so you should avoid it.
So you have to determine precisely if you need to put some stones away from the board.
When there are some isolated groups of stones inside your territory you have to check if they are dangerous. Can they eat some of your stones? By eating, will they be able to survive instead of being captured? Or can they form 2 eyes by just adding 1 stone and get to survive, occupying a piece of your territory forever?
Do you have a clear answer to avoid any consequences or do you have to correct the defect already?
That’s not always easy to assess, but that’s essential. You can’t let your opponent play twice somewhere else because of you being too careful.
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