Hi all.  I have another very interesting
encounter to show you today Stockfish
against Leela - this is in the chess com
Winter Classic final which is 10 minutes
with a 10 second increment so let's see
what happened. e4  from Stockfish the
opening book given to them is in the
classic Giuoco piano so we have here
black playing now Nf6 c3 a6 a4 
black castles Re1 bishop
tucks away on a7 Nbd2 and now Knight g4
hitting that soft spot so what's the
idea of this.  Can't it be easily defended
R2 - King h8 now we have the knight
being kicked and it goes to h6 so the
idea was not just to encourage Re2 but to
but prepare f5 unlocking the potential
of the F pawn here to get some play on
the F file generally. b4 f5 then we
have Nh2 f takes e4 one slight downside
with this approach of opening that semi
open F file  is that white also has now
semi open D file pressure which could be
handy we see Qf6 Ndf3
Queen g6 and now there's one or two
threats here the immediate concern is
Bishop takes h3 what it did actually
play King h1 and you might wonder hold
on a sec isn't  there a tactic for white here
if Bishop takes h3 - can't white
play this Nh4 - actually here
there's Queen takes e4 hitting the loose
bishop on c4 so this ends up being very
nice for black and also by the way
instead of King H1 - Knight h4 immediately
it seems Queen g3 is pretty strong
converging all the pressure on f2 here
and what does white do if say this then
Bishop takes h3 now
and here actually black can tactically
handle things nicely for example like
this with a big advantage so King h1 a5
and this is very interesting for trying
to get this key dark square the c5
square if white plays b5. White is not
tempted to do that White played Queen d2
keeping things solid here protecting
actually b4 as well indirectly but also
Queen g5 is on the cards sometimes if b5
had been played the c5 square is very
nice for black so Nd8 say this
position black ends up protecting things
and the knights on the back row but this
actually springs back with vengeance
blacks getting a small edge here at
least that c5 square could be very
useful in the future so we have actually
Queen d2 just keeping the tension here
not playing b5 Knight g8 and now b5 here
so relieving the pressure on b4 so
this Queen can actually move and it does
actually go to g5 now Leela obliges
with the Queen's coming off now we have
Nf6 now this is taken actually so
that's an interesting decision by giving
up the dark square Bishop quite often as
a light square strategy here you can
imagine potentially if a knight manages
to somehow get to d5 this is going to be
sensitive for c7 and d6 later because of
that semi open file so it's a very
interesting decision to give black hand
black the bishop pair is this dark
square Bishop going to be useful or not
this is the right way to take it, it 
seems on G takes Knight h4 is annoying
for black so keeping the pressure on the
f file seems logical but now we have Knight
g4 now black doesn't really want to give
up the light square Bishop here so we
have actually Rf4
for putting some pressure on e4 Nfh2
now supporting g4 which means this knight could be heading to e3 to d5 to hit c7
so there's an interesting tactics in
this position emerging if White had played
rook f1 blacks in a comfortable position
here as an example just just to
illustrate black can increase the
coordination on the F file and play for
e4 pressure and the King's there and
looks a bit dangerous but eventually
yeah White's cracking here in this
position it seems as though yeah black
can really build the pressure in this
fictional example so here if for example
Ne3 rook takes e4 this position is
only even but black doesn't have to do
that black can play Knight c5 to
safeguard the diagonal fast and look at
the pressure on e4 it's very awkward for
white blacks getting big advantage there so
there's a lot of pressure potentially
building up on e4 and the F file
generally so we see this move Nfh2
h5 and this really encourages now
after Ne3 for black to take this pawn
so is this a trap being set a tactical
trap. Leela obliges to see the trap effect
by taking the pawn. On c6 white will just
protect that pawn potentially and it
should be at least even even though
blacks got the dark square bishop it
might be difficult to do stuff with it
so we have that been taken and now we
have Bishop d3 and then looks as though
this forcing sequence could be nasty
after Knight d5 so hitting f4 and c7 now
a shocking move here I wonder if you can
guess if I give you five seconds
starting from now what does Leela play
okay Ne6 - a center pawn was taken out
which is perhaps worth more than a pawn
Black's bishop pair must be worth
something
it's these factors which make this a
very interesting exchange sacrifice for
just one pawn before we get into it if
Black has gone to f7 isn't yet another
forcing move to face and this is getting
a bit nasty
if for example here well let's have a
look at rook d7 it runs into it seems
Bishop e8 and so if black is really
losing c7 this is horrible is now d6 and
that frontal pressure on d6 so this is
gonna be horrible White's getting a big
advantage so this seems to be a
virtually forced exchange sack given the
nature of the forcing moves coming up
So Ne6 is very interesting Knight takes
Knight takes rook d2 and that Bishop is
snapped off so it really is a raw bishop
pair without any counterpart Bishop 
either Bishop e6 and we have potential
central pawn mobility and also
interesting in this endgame to consider
the light Square pawns are fixed and
potential targets with Bb3
later we have f3 okay that weakens the
diagonal rook f8 and that looks as
though that pivot point f4 is had handy
to hit a4 for for example Nf1 h4 fixes
down White's pawns first before they
anything. rook drops back now Rf4
for looking at a4 it looks as though
White's really tied down and there might
even be Bishop b3 potentially this
is addressed anyway with Knight d2
holding b3 Kf7 rook e1 and
the King comes towards the center so
it's a very interesting position to
consider for an exchange sac because it
really looks as though it's not just a
bishop pair the extra center pawn but
blacks King mobility compared to White's King is superior so
there's a whole bunch of little
factors which seem to really justify
being the exchange down it's actually
very difficult for white to play this it
seems we have Re4 and black just
welcomes an exchange of rooks with King
f5 if by the way rook yeah King f5 was
played instead of Re4  if White
had played Ne4 just to illustrate the
central pawn mobility d5 King f6 and you
can see this is really quite nice for
black things are coming along so Re4
King f5 look Rae1 if this rook was
taken the King can actually play a good
role in this position the fixing these
pawns really help the King not to be
harassed and as an example just to show
an example how the bishops can cooperate
with the active King to herd through
passed pawns - this shows a really
dangerous example when the King can
infiltrate with a big advantage as an
illustration - so rook Rae1 not taking on
f4 g5 king h2 again here rook takes f4
this really doesn't seem to help white
this position Bishop can entrench on e3
and probe and look at c4 it's just
blacks got all the play here White is in
a very defensive state so we have king
h2 bishop d5 really encouraging white to
take that rook off G takes rook c1
bishop f7 here some accuracy is needed
if Bishop e3 this position it's possible
to play this if now say this this
position where both bishops were
attacked it could actually be equal for
white - breaking through on that d file
that's the last thing black wants so
Bishop f7 we have c4 King e6 Ne4 Be3
Rc2 Bg6 ... Kh1 ... Now Bd4 ...  Black
is slowly improving the position now c6
b takes b takes ...  King h1 Kh1 Kd7 .. you
might think is there something wrong with d5
well the rook on the C file yeah it
makes d5 difficult here there are
resources for white this way might
actually be an advantage to black yeah
white could be in trouble but in this
line here Knight g5 might be the better
way to for white to go and still fight
here
but even so blacks got a slight
advantage so it it was possible but this
just makes things it's interesting to
see what white is actually doing with
King d7 rather than just sharpening things
up immediately seeing if the position
could be improved Knight f6 King goes
back to d8 - this might seem a bit weird
potentially the black king could go up
to be b6 and try and get in b4 so
this is a dangerous route into White's
position King h2 if Knight e4 as an
example King c7 Bishop takes and if the
King steps here and is not cut off and
getting to the c5 square then this is
all over once black pits picks up an
outside passed spawn that's all over this
will be absolutely winning passed pawn
guided by the bishop so we have King h2
Bd3 Ne4 Kd7
Taking is is
nothing giving up the bishop pair here
because the King can be stopped with
rook b1 that should be only even
so we have King d7 and now Bishop b2
this now it's starting to get really
nasty after Bishop c2 the bishops really
cooperating to win that a4 - that
long-term target and look how it's been
neatly sealed up on the King side
without h4 restraining White's pawn
structure so White is just a spectator
here
it seems we have Bd4r hitting
the rook and now this pawn has taken it
looks as though this is just - White's
position has collapsed this is very
desperate looking g4  ... black takes with
the f pawn - so not even giving white a major passed pawn the h-pawn might have been
something but the f pawn seems yeah how can we use the f pawn so another passed pawn
yeah it seems as though stockfish has
given up in a way on the position c5 d5
Nb3 Bishop b2 so an important
tempo there to gain a4 without
losing the a pawn so that pawn is a real
winner in the position it's
basically all over and we've got central
pawns now moving so we've got another
two connected pass pawns here three
connected passed pawns in total now there's
like two connected passed pawns over
here so five connected passed pawns on the
board as the Count (Dracula) in Sesame Street would say  - five ah ah ah.. so Kd3 h3 we have
King e4 - five passed pawns very impressive we have - yes it's all over check from the
bishop now under promoting a knight
to try and get in d2 and e2  -  the d3
pawn is taken with check
so this Knight comes into the game g2
just just the show btw - so if this
knight was taken then g2 - look at these
pawns
Space Invader pawns d2 to for example e2
yep they are queening
so rook takes d3 check King e7
Nf2 we have g2 now Nh3 - that
pawn is taken so it looks as though why
did Leela give up that pawn but this is
still winning over here this is still
absolutely winning there's enough pawns
to win this.Nc2 was played
again even this point its though it's no
big deal
if that pawn is taken this is still this
forking the rook and knight here is
going to just help the a pawn queen so
Nc2 we have a2 - yes
it's it's all over bar the shouting now
off after Nc1 especially this is just
yep nothing to see here anymore okay the
game does carry on a lot though but
basically it's essentially over and if
you notice the decisive wins - it does
seem to take a time winning compared to
Stockfish in general that the longer wins
seems to be seems to be from Leela at
the moment and this is part of the
reason this kind of mad shuffling around
instead of getting on with checkmate extends
the game quite a lot you know eventually
the King comes up the board to offer
some assistance and it's all winning of
course checkmate
so a nice exchange sac game for a load
of passed pawns connected passed pawns so
it was recommended for me to check this
game out. Thanks for that -  please keep up the the
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get some and I'm just gonna do one or
two so one to ten
so here are black at this point was
threatening bishop takes h3 - it
seems to work because there was a loose
bishop on c4
just to recap so even though White was
forking there defending it seems Queen
takes c4 so we got a clear advantage
tactically like that ... now here Bishop
takes  h3 threatening mate
okay this scenario blacks to play for a
clear advantage wasn't rook take e4
Bd3 .. Nc5 covering d3 first ... then Rxe4
so things to look out for black to play
for a clear advantage I think was it
just herding the pawns
- Kf6
yeah the pawns looked pretty good I
I think here taking with the King
actually was it the King was it the
pawn - actually we take with the
King - there is Re4 - that's
just the pawn.
And there's all sorts of things
yeah we can just we just get a great
position here I think. So it was just a great
position to play with black so g2 e2
- well it's absolutely winning -
yeah of course - e2 - and d2 - okay I use
the hint there .. okay black play for a
clear advantage here ... I think we're just
playing check and Nd5 forking
to get the blockade lifted
from a2 - getting rid of that blockader
For the b4 knight - interesting yeah just to
recap it's good revision for other for
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Thanks very much.
