AI Joseki #2 The Direct 3-3 Invasion variation 2

hello I'm Michael Redmond and in this
video I'm going to be talking about a variation of the 33 point joseki in which
black cuts in the second line so this is going to be when black plays a knight's
move here white bumps against it and plays a hane so in this case black now
has a choice of playing away or playing a hane here or extending here so I
talked about the extension in a different video and that's going to be a
link up there so you can see that or in the comments below in this video I'm
going to talk about the hane here and when white covers here black can cut at
this point so this is a very popular variation of this joseki and it is a bit
more complicated than most of the 3-3 point variations so I'm going to go
into the mechanics of it first and then show you some full board positions when
black plays here white has a choice of capturing here or cutting here but first
I should mention that when black goes into this variation black is thinking
of building sickness or strength towards that direction so black is thinking of
surrounding maybe surrounding territory on this side or at least building some
kind of a framework so this is one of the things that makes this at first hard
to understand because when black played this move you might have thought that
black was trying to build in this direction it's very natural to think
that black is trying to build a territory or a framework in this area
but the point is that when black cuts here that all changes and black is
pointing trying to point towards the left side and usually that's how this
joseki will turn out so that means that with the first move the marked moves
there on covering on the third line it matters less which side black covers
because black has this option to switch around and make a territory on the upper
side or as I showed in the keep it simple video black could have let's go
back a few moves and say that black if black had chosen this variation for
instance then it would have been much simpler for black to build territory in
this direction so black has that choice black does not have to necessarily make
that choice at the time black played here but in this fairly flexible
variation black actually has a choice right now in this variation I'm going to
show you this one and black cuts on the second line usually white will cut on
the second line too so that's this move white has to do something to protect
these three stones so White's choices were to cut on the second line or just
to capture the one stone so basically white just has the two choices
so first I'm going to to go into this one and black gets to squeeze here so
the squeeze is quite satisfying but you can see that already
black is giving up some potential in this area so White's going to be
actually moving into the side while black takes a position on the upper side black captures the one stone and now a
lot depends on the ladder when we're playing in a parallel opening quite
often white has a stone in the corner here in the lower left corner if
white has a stone on the marked point this is going to break the ladder
so in that case for instance when white plays here black would like to have the
option of capturing the ladder and if black can capture with this letter
usually this is going to be a local success for black it's going to be good
for black unless White has a very effective ladder
breaking move otherwise if the ladder does not favor black the shape is to
play here now when black plays here obviously the white stone is not 100%
dead yet White does have some potential at A but
first I'd like to take a look at some of the other moves which for white are not
so good so for instance playing here is a weak shape it's not a strong shape and
black can just play this shape move this gives black good shape it takes away the
danger of white playing a hane here and black is leaning on the white
group on the right so black should have no trouble handling this light even if
we just simplify it by saying maybe white plays here or maybe black plays
something like this that might be a slack move it looks good for black anyway
otherwise black could play something on the right side something on the right
side like this would be just fine for black and white is going to be very busy
because the group on in the corner also if Black gets to come down at this point
why it's going to have to worry about eyes eventually so this is not going to
be a problem for black when blacks group on the upper side I'm talking about this
group here this group is already very close to being alive so black has very
little to worry about so I go back a few moves another move that might be
worrying would be this one but actually this is not a problem for black first of
all it does depend on the ladder so at this point black has two choices for a
ladder black and play a ladder from here or a ladder from here and if we say
there's a white stone here both of those ladders favor white so maybe it's not a
ladder it does depend back does have two
choices so that increases the potential for a successful ladder but if the
ladder doesn't favor black black can just play the squeeze here white is
gained very little white is capturing stones from
what it was already pretty close to a live group and blacks thickness on the
outside is improved this wall is actually bigger than it started to be with
this point also being sort of a forcing move back already has a very nice wall
there so this is not a not anything that bothers black I'll talk about the other
move with white playing a day in a real board position a full board position
from a real game so here we are with white playing direct 3-3 invasion
this is actually a very popular opening with black playing the high Shimari here
this is another move that was originally played well it has been around a
long while but it became popular after alphago played it so black quite often
in this case black covers from this side and again one would usually assume especially if you learned go before alphago you would assume that black is going to
build a wall like that and have it pointing in this direction so black
wants to build this area but in this variation that we're studying in this
video it actually turns around and black is going to surround the right side so
white crawls and black play the knight's move and with this hane here White's best move is almost always to cover on the second line so when this happens black
does have the option to do something to surround the lower the right side that
is this area and one way that black could have done it would be to play the
double hane and I talked about this one this move in a separate video but in
this case black is going to cut here this is by far the more popular move and
white captures one stone black gets to squeeze the squeeze is
very satisfying but again you see at this point the ladder does favor
white so black cannot play here to capture whiteI would just escape and this is
going to this is going to come along this diagonal and hit this stone I might
have swerved a little bit to the left but it's gonna hit that stone anyway so black will not do that but we'll play
the Knights move and this makes it difficult for white to immediately move
out because moves like this moves like this I showed you they don't work I
could go into one more variation and show this move again this move is a very
clumsy shape for white and black will have nice shape on that side it looks
bad for white again because this black group on the right is already alive
it already has very close to a living shape will have no problems with white
attacking you so this is not going to be successful for a white white played away
this reduces the scale of black moyo on the right and we're going to go a bit
further because we get another three three point and in this position white
actually played away and that was one of the potential moves there this finishes
whites position in the upper right so it's important to remember that after
playing the so as to say joseki sequence that goes up to this move
playing here on the upper side is the follow-up move that white wants to play
so this is also an important move to remember if you're the side who's
invaded the three three point and black played away black played here
this is also a big move that is reducing White's potential on deeper side by
opening up the potential of jumping in here and it gives black a very nice
territory in the left corner so it's a big move to black and play when white
has played away from that position and upper left and now we get to see white
playing this move which is going to start a fight there now if black plays
the strongest local move would be a play here white will jump out and black can
connect with this move this is actually going to be an even fight or maybe even
an advantage for black in the fight in the center of the board but white will
have ideas to use this fight just to scoop out all of blacks potential
territory on the right side so that's the plan there you can see that in some
cases white will play a move somewhere around here and be forcing black to play
a stone here if white can just fix up the connection there that is another
thing that could happen for white and it looks like white has reasonable
potential to make a living shape on the right in this general area white
doesn't really have to hang on to all of the stones but is going to focus on
living on the right side of the board which is the biggest black potential
area so maybe that's not so good for black in the game black actually
sacrifices the three stones which I think is a reasonable idea black played
here white pushed through and black just connected here so this sacrifices
three stones but there is some potential white invaded to the right side now and so
the fighting will shift to that area it will shift to the area where white has
just invaded here so this area but black does have that potential at A so just
to show you what the potential there is black does have this attachment here and
if white simply connects I mean it simply plays
underneath then black can continue with this if white continues to answer
submissively black will be able to save the three stones so you can see there's
some potential for black to do that white will probably play something on
this side and black will be able to reduce the upper side using this
potential so that's one example another way black could go about this it's not
as if blacks going to do it has to do it immediately but black can be doing stuff
like that or could be playing some other move which will more indirectly be think
thinking threatening to do something like this or something like this or
something like this to make use of those three stones so there's some potential
there otherwise black could start with with a move something like this so all
of it in each case it's the same idea that black has to make use of these
three stones in some cases sacrificing them and getting inroads to the upper
side to be able to reduce the upper side in return would be good enough so now
we're back to the upper right corner local diagram where black has just
played this cut and again I would like to go into this variation there is one
more option for white at this point which is to play a hane here and this
is by far the more sharp of the two variations before I was showing you
white playing this knights move playing the hane here is much more
aggressive and exciting I'd say in this case black will cut once and I suggest
this is the best move black actually has two choices with this move black could
play this one or a black could play this one this also saves the three stones in
this case white would play an attachment here black would capture one stone why
it would jump you can see that having the potential forcing move here white
doesn't really want to play it yet but that fixes white shape on the right I'm suggesting this is the main line and
if white escapes this is gonna be bad because black can just crawl along you can
see that whites group in the corner does not have any way to make a life so this
group is in danger of dying at this point and whites groups on the outside
you can say there's two white groups because they're cut they're cut off from
each other these two white groups both have trouble with a lack of liberties so
blacks going to be able to escape out on the right side in this direction and
white will have no way to live in the corner which means blacks gonna get a
huge territory there usually this is good for black especially when black
has this cutting stone which is let's mark it with the pen this cutting stone
is causing some trouble it's going to be a troublesome cut until white
spends a couple of moves really to capture it there's also the fact that
blacks group on the upper side here is it's pretty much alive so it's not in
danger being counter attacked so I'm gonna say this is good for black and
white will probably just play here black takes and for the time being the local
fight seems to favor black like white can play maybe here here maybe something
like this but I think this favors black so let's take a look at that in a full
board position in this game white did cut here and black cut on the second
line so from the local diagram we have the same corner but the colors are
reversed it's the same joseki so white has chosen to build towards the upper
side and black made an interesting decision here black could have played
the Knights move but again we have to remember that in
this case the ladder favors white so white would just be able to capture the
one black stone so maybe that's why black played the hane here there's
also the fact that black has this these two stones in the upper left corner so
maybe black feels that he can he has option of fighting strongly here white
cuts black escapes obviously and white captures as I was saying it's probably
not a good idea for black to run out here so black is going to play the
Knights move and here black has made a position on the right side this is now
it's fairly safe I'm talking about this group here it's a safe position but
black stones in the center the three stones here are not so strong so they're
they're a bit weak I'd say and White's group on the upper side is alive more or
less and so the white group is the one in the center this group here which has
captured one stone so it's on the way to making one eye at least and I'd say
white will continue at A so the normal move would be for white to continue at A
so let's put a stone there and you can see that in the center it looks like
white has more potential to attack than black does so if white continues while
black is playing in the center maybe White's going to get two points here
which again would put some pressure on black and upper upper right corner it
seems that white has locally more options of course from blacks point of
view black did take the upper right corner and has positions in two other
corners this position in the lower left corner this territory is already a
territory so black has something like 15 points here and that position in the
upper side upper left corner this is not really a territory but it I'm calling it
just a position that black has a potential territory at least it's
going to be a strong group so black does have these advantages you can see that
white does not have any solid territory yet so I guess the game on the whole
while white has the local advantage white does have to make something out of
it so maybe it's an even fight so here we
are back at the beginning position I do have one other variation I want to show
you when black cuts here my does have the option of playing here now this
seems to be giving black an advantage a local advantage here when black gets
the cover here and will play a connection probably on the third line
this is a way white wants to play when he wants to play simply and wants to
take sente so white wants to have a tempo to play out away from this
position elsewhere on the board the mechanics of this variation is very
simple white has just taken the one stone sometimes you see computer
programs wanting to take from the first line I don't really advise that but it
probably ends up in the same position anyway so let's look at this in a full
board position so I'll start this with this position black has played to
approach moves towards white on the left side and has played here so this is a
modern opening it it has been around for a while before we had computer programs
but also it's a modern modern ideas black is playing very quickly a quick
paced opening white jumps into the three three point and in this case black
covered here again this is a board position where black seems to have more
potential in this direction so you might have expected black to play cover from
this side however playing here we shall see black turning around with the
variation I've been talking about today so black plays a hane
and then cuts here so white did have the option of cutting on the second line and
getting into this variation however you might notice that black has played an
approach move here just this one approach move actually it has an effect
on the ladder so if you look at the ladder when black plays here now I think
I did that fairly well it comes diagonally and it's gonna hit this stone
here so the ladder actually favors black that might be the reason that white
avoided this variation so white just took the one stone and black gets to
play here and connect so it looks like black has done a fairly good job of
closing off the right side black has a nice potential territory here it doesn't
look very good for a white to be trying to jump into that area where black has
so much strength but white did get sente, white got a tempo so now white's
going to invade the upper side and it seems that white has potential to sort
of make black pay for playing to kakari than just leaving it so white is
starting to attack that stone and black is limited to the right side I don't see
anything wrong with this for black black does have it have a very nice position
here but since white got a tempo to invade the upper side it's probably an
even game so today I've been talking about the cut at one and the main
variations that derive from it so I'm going to call this that we're looking at
right now the main variation and another variation that I did mention is when
white captures the one stone here and black gets this nice wall but black does
end up giving white a tempo so I hope you liked the video today and
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thank you

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