Should White connect at a, atari at b or play c?
Answer: b and c are good endgame but a is urgent. White has a shortage of liberties and will at least lose the 2 central stones if not connecting at a.
Should White try to save his stones with a, sacrifice with b or play elsewhere c?
Answer: the top is relatively small and it's not clear how to use the remaining aji. The right side is the big/urgent area to play.
After White can make the natural answer at a, flatten Black's moyo while attacking the lower right group with b or play c. Which one is better?
Answer: a is the best move here. Black's atari is either sente or costly, White makes territory and affects the group above. Also, b and c are too close to the bottom right thickness.
White has a big lead (33 points). Black is trying to stage an upset. White lost 10 points by making the wrong choice between a, b and c.
Answer: a was the slow connection here. Connecting at b would already be better but c would be most efficient.
White's left side group needs to pay attention to its eyespaces. Should it play a, b or c? White's choice lost another 9 points here.
Answer: White chose the dull move b. Connecting or making another eye at a would be better but the most active move is c'. Black can't play b because of a shortage of liberties.
A ko has developed along the left side. Which ko threat should White play, a, b or c?
Answer: b is a local ko threat leading to more local ko threats.
A skirmish has been going on in the lower right. How to continue? Turn at a, the border of two moyos? Draw out and fight at b? Or take the big point at c? White's decision lost 4 points and dropped him from 80% to 60%.
Answer: turning is best. Fighting at b is not good because the lower right is already alive. The cutting stones are disposable. The three stones are vital.
White has the upper hand in this game. Should he cut at a or b? Or is cutting not very valuable and is this the right time to invade the corner at c? White's decision cost him 13 points and brought the game back in balance.
Answer: cutting straight through with b is best.
White has ended the ko in the upper right and Black follows up the threat at with cutting at . White's next move is not game losing but there was no need to spoil 35 points of a 60 point lead. Where should White play, a, b or c?
This is more or less a joseki question. Should Black press at a, cut at b or connect at c?
Black's choice dropped him from 77% and 4 pts to 30% ans -2.
Things are hot in the upper left. Should Black keep White disconnected at a, cut to capture at b or play the vital point of c?
Black's choice lost 2,5 points but shifted the balance to White again and was the start of lots of trouble.
is enlarging Black's moyo. What should White do?
This is a big mistake in the opening. After , White leads already by komi, provided he makes the right move. What is biggest?
Black did not hesitate to play the double hane. After the atari and connect, White can choose to follow through in the lower left witg a, sacrifice three stones and make a ponnuki at b, or save his corner at c
How to respond to the cut? Counterattack at a? Or connect at b or c?
Black builds a huge moyo. Should White reduce (a, c), invade (b, d) or play away (e, f)? The move I chose wasn't really bad and I'm actually quite happy with it.
Another slonection. White should block at a.
is heavy. The hanging connection at a is the shape to get out.
is taking the upper hand but there was no reason not to atari from the outside.
Black has an almost perfect opening but would have been better at a. It gives some shape to the weakest group and it also reduces the central moyo forming.
The vital point in this position is b which Black can take in the most forcing manner by playing a first. White can ignore and take b for herself.
The game is already over after the kill at the bottom but is not even necessary and Black can play elsewhere.
reduces the more developed half of the moyo but allows Black to build strength towards the less developed half. Any of a, b, c is better.
Big tactical mistake by White, who should play a instead, making an extra liberty in the fight that matters. After , a black move at b would end the game.
a is a much better connecting shape, because if Black cut at next, he'll suffer from shortage of liberties
White's central group is too weak to pull off the large scale surround of . A move at a strikes a better balance of attack and defence.
The real shape point here is a. White will be forced into very small life. Forcing first at b is also an option.
White should have taken the corner instead. It's difficult sometimes to know when to take the corner and when the outside.
extend from a crosscut they say - it's not so easy. Atari at a or ruin the shape at b are better, combined with peeping at c to create a living group.
This is connecting the tail to the body leaving the whole to be cut off the head at A. I thought Black had shortage of liberties here but he can always capture at b.
Black misses a tesuji at A.
Black has found the tesuji but postpones its execution at A, while there is no time for that. White can now force at .
Black is in trouble at the right side. Before living, I decided to play this forcing move. The problem is that it loses a possible atari in the fighting on the right. KataGo doesn't show any variation where it shows up but I assume that's the reason for losing so many points here.
is also a weak attempt at living. Black should play A.
White has gotten into a bit of unnecessary trouble here and is too much. White should give up that stone and make an eye at A.
White can trade here: capturing the bottom is larger than saving the lower left. A wins the capturing race.
Perhaps not so much a slonection as a not-so-urgent connection. When cuts White's shape is affected while Black takes central influence, so loses lots of its value. Instead White should connect at :
This time Black's shape is problematic while White's cut off left group is not so easy to attack. White has many good places to go now (a, b, c) and Black can't be everywhere. I get the idea but I find it hard to implement and follow through.
I thought the turn at was a nifty way to respond to but KataGo thinks White should pressure the upper right now and treat the lower right more lightly. A and C are obvious moves but B, creating some aji at the center, is a subtle move.
Another lazy bamboo. White can afford to cut at A.
When having a surplus of stones, is a slonection. Black can play more forcefully with the descent at A, prompting White to scramble at B then block in sente again at C.
It all goes downhill after this cut at . In this case Black should connect at , fixing the shape to pressure White's weak diagonal in the corner while allowing White to link up to the left. THere's just too much going on here to play this forcefully. Go is a difficult game.
Not only a slonection but a heavy one too. Instead, White should give up those light stones and reinforce towards the left side.
bugcat: As an EGF 5k, I can definitely see myself making this connection, especially if I was under any kind of time pressure. I find it helpful to justify a like this, with a prepared sequence that creates a net to defend against the potential cut. It might not be the best endgame but the idea is made clear.
allows Black to turn the capturing race into a multi step ko?. Black has a lot of ko threats in the lower left and the centre, while White has virtually none. KataGo will find ways to still win but WHite could have simplified a lot by taking A for himself.
is like a declaration of victory, while White is not ahead. A is necessary to stay level, while Black can't pull off a living invasion.
is a 2 point reverse sente. A is bigger than that.