Posts: 6727 Location: Cambridge, UK Liked others: 436 Was liked: 3720
Rank: UK 4 dan
KGS: Uberdude 4d
OGS: Uberdude 7d
I don't know what the textbooks say (q14 to prevent press and threaten invasion?), but confident to predict bots say black should correct his mistake of playing a 5-3 point by closing the corner, per gospel.
Dosaku played the ideal 5 space extension from the top left enclosure, leaving the 2 space extension at a towards the bottom left enclosure, or a one space jump at c if White extends to b. This is one of the first things we learn about development from a corner enclosure. It is surprising to learn that it could lose so much in such a simple position. Assuming komi, OC.
Doetsu approached the bottom right corner and then Dosaku played the extension at on the bottom side, which also prevents a pincer against . But that excellent play seems to be dubious, losing 5% by comparison with d, according to Elf. e and f are also playable. (It would not surprise me if Elf preferred e the next time it analyzed this position. The bots love the press. )
After pincers, OC. Then Black plays the press in the bottom right corner, followed by his own pincer at . makes a small base, continuing the attack. Then, instead of the two space extension at a, Black attaches against the corner enclosure on the 3d line.
After the press in the bottom right, plays the 3d line attachment in the corner, and then Black stakes out the bottom side. Then plays his own press in the top right corner. The press is a real workhorse.
Making a second enclosure is also an ideal textbook play. But before the AI era Dosaku's extension would also have been considered playable. One problem with it is that at 9 is too good. The 5-3 stone, , cries out for an enclosure.
plays the taisha. OC, a is also playable. plays the slide. Then plays the 3d line attachment against the top left enclosure, and White stakes out the left side. plays the attachment at b.
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Posts: 474 Liked others: 62 Was liked: 278
Rank: UK 2d Dec15
KGS: mathmo 4d
IGS: mathmo 4d
Speculatively: Current position: 1. Of course B must play R4 or perhaps Q5. 2. Is Q15 a textbook move here? I think it is probably one of the best alternatives.
Opp to play 1. Of course W should play R3 or R4. I prefer R4 in this position since P3 already splits W's lower side development so R3 doesn't really help (it isn't as if the lower side is B's and R3 helps gain access/life with N3 and P2). R4 helps attack the upper right 3-4 stone too. If not, I would exchange Q15 first before diving with R3 (or perhaps still R4).
Past: 1. B has deviated with the lower right 5-3 and W at K17 is weird to compete for the relatively small upper side, especially without having gotten Q15. B has sente to play R4, so B is marginally ahead.
Check: 1. of course, but I somewhat expected B to have played on the lower side instead. They seemed to really like creating living groups on the 3rd line back there, slightly disrespecting the D11 and F16 centre reductions.
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Bill Spight
on the bottom side, which also prevents a pincer against 
. But that excellent play seems to be dubious, losing 5% by comparison with d, according to Elf. e and f are also playable. (It would not surprise me if Elf preferred e the next time it analyzed this position. The bots love the press. 
pincers, OC. Then Black plays the press in the bottom right corner, followed by his own pincer at 
. 
makes a small base, continuing the attack. Then, instead of the two space extension at a, Black attaches against the corner enclosure on the 3d line.
plays the 3d line attachment in the corner, and then Black stakes out the bottom side. Then 
plays his own press in the top right corner. The press is a real workhorse. 
at 9 is too good. The 5-3 stone, 
plays the attachment at b.