Charles Matthews - Setpiece Kos, Vol. 7.- Secret Weapons

8/10/2019 Charles Matthews - Setpiece Kos, Vol. 7.- Secret Weapons

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Go Articles Charles Matthews

Setpiece Kos

Secret Weapons

Theme 5 Double hanefor koTheme 6 The cut at the 3-2 poitTheme ! "i#hti# o$er the %-% poit

This article #i$es iformatio o some of the commo wa&s to start a ko thatma& remai hi''e from a uwar& oppoet( )ow e*actl& to use thesepossibilities+ whe the& are o the boar'+ coul' be take to be a ,uestio oftimi#+ for a perfectioist or theoretical poit of $iew( r it coul' be treate'as a pra#matic matter+ as was 'iscusse' i the first sectio of part 6(

Theme 5 Double hanefor ko

The presece here of the marke' black stoe meas that .lack ca fi#ht a koto sa$e this #roup( This sort of use of the first lie stoe to resist stro#l& isresposible for ma& remarkable ko tactics(

As i this case+ there is ormall& a local ko threat for /hite 0o poit .lackcoecti# the ko after /hite %1(

aturall& this i'ea is a bi# failure for .lack i a case like this+ with o blackstoe at A(

t ca work i the corer+ as i this case+ as a hi#hl& a##ressi$e wa& to pla&(These 'ouble hae kos are ofte 'a#erous for both pla&ers( this situatio/hite ca e*te' to the %-2 poit+ so that .lack ol& has oe e&e i the

corer(

4i Kaiho-Che u'e+ 22-3-5+ from the Gui7hou Cities 8ea#ue team e$eti Chia( .lack puts stra'e' stoes to #oo' use(
http://gobase.org/service/uncgi/bin/replay-sgf?gam=/articles/matthews/ko/part7/sgf/game01.sgfhttp://gobase.org/studying/articles/matthews/ko/


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.lack ! a' 9 cause shorta#eof liberties+ as well as setti#up the ko with %%( /hiteca:t resol$e this situatio b&cutti# throu#h i the cetre(

%5+ %;+ 2%+ 2< i ko( /hite%6 is a local threat( Thepositio is clarifie'+ with.lack coecti# out after2!(

the aftermath+ /hite hasto sa$e two #roups i thecetre( .lack wo the #ameb& a small mar#i(

Cheo# Tae-sa# $ersus =u

Ch:a#-h&eok+ 22-%-%+from the Korea >:ae-wa#touramet( /hite pla&s apowerful #ame base' oifluece(

the starti# positio+ lar#e-scale corer opei#s i the upper left a'lower ri#ht ha$e left /hite with stro# ifluece( this fi#ure /hite be#isto buil' i the cetre(


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;3 coects abo$e ;%( /hite 66 takes eou#h cetre profit to remaicompetiti$e( The pla&s !9 a' so o from .lack are preparatio 0threatamplificatio1 for the attack to come o the ri#ht(

%+ %3+ %%+ %%3+ %%6 i ko+ %%; takes four stoes 0umberi# restart % ?%%1( After ;5 the ri#ht si'e becomes ko o the e'#e@ but .lack caot pushhome the attack(

the rest of the #ame /hite pla&s resolutel& as .lack resists the forci# pla&%22( Althou#h .lack makes substatial iroa's i the lower left ,ua'rat of

the boar'+ /hite remais comfortabl& ahea'( .lack resi#s at the e' of thisfi#ure(


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Kato Masao-ie /eipi#%9;5-;-29+ from the first apa-Chia Super Go( A hi''e hanestarts a kotop ri#ht( There is aother oe implicit i the lower ri#ht corer(

The wa& of starti# a ko with .lack %+ 3+ 5 is a har'-to-see $ariat o the'ouble haneko(

%2+ %5 take i the ko( Threats i the fi#ht are mi'ful of a $er& comple*

positio i the left cetre( .lack i#ores %6+ cofi'et of sur$i$al there+ but/hite has a seco'ar& attack after 2;(

.lack makes a profitable life o the left si'e+ but /hite cuts throu#h i thecetre+ for a bi# tra'e-off( /ith 56 /hite acti$ates aother ko(
http://gobase.org/service/uncgi/bin/replay-sgf?gam=/articles/matthews/ko/part7/sgf/game03.sgf


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63+ 66+ 69 i ko( /hite #i$es up o the lower ri#ht corer+ simpl&cosoli'ati# the cetre with ! a' !


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fact a couple of e*amples show Cho Chiku a' Sakata io pla&i# atariwith % here before starti# the ko( 0A' i aother case akamura-Takemi&a+.lack 'oes:t pla& % at all+ but there oe ca see that .lack woul' take ae'#ame loss of a couple of poits if the ko were lost(1

The fact is that if .lack 'oes:t pla& there+ /hite ca+ i which case /hite cacoce'e 3 a' 5 without losi# $er& much( /ith a black stoe at 2+ the ko ismore serious for /hite(

shi'a-Sakata %9!5-5-%5+)oibo match #ame %( A

uusual taisha$ariatio( t is#eerall& belie$e' that thepla&ers were o ba' terms'uri# this match(

/hite %6 creates a ko i thisfierce $ariatio 0/hite ; is

usuall& pla&e' at 91( /hitehas local threats for it+a#aist .lack 5(

2< i ko( /hite wis the fi#hti the corer(

The #ame has ture' ito at&pical Sakata shinogi fi#ht+


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with /hite ha$i# territor& i the corers but ee'i# to settle the cetral#roup(

Mae'a obuaki-Sakata io(%955-!-%3 i the %st Saikoi8ea#ue( This is a e*tremel&obscure $ariatio of asta'ar' 3-3 i$asio+ usuall&see ol& i the 'epths ofBoseki 'ictioaries( 0A Koreareferece work su##ests thiswa& of pla&i# ma& fail for.lack(1

The hae-u'er pla& .lack ak Cheo#-sa# 2%-%-%%+ i the 6th Samsu# Cup(This e*ample mi#ht make oe 'espair of ko theor&( To e$aluate precisel& thebul#e ko that arises i the first fi#ure+ oe woul' ha$e to look ahea' to the

corer ko fi#ht of the si*th fi#ure( Ma is the trickster of cotemporar& #o( .&the wa&+ the %6 cut for .lack to attack i the cetre+ while fi#hti# a ko tomaitai the 'iscoectio+ is too far-fetche' to be worrie' about(


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9 takes i ko( .lack sets up at&pical bul#e ko+ ha$i#prepare' a clea source ofthreats with .lack 3(

%5+ %;+ 2%+ 2

.lack:s clamp at !! becomes 'ecisi$e+ sice /hite 'eci'es that to aswer at!9 woul' be too passi$e( .lack #ais a ko for life i the corer(


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9%+ 9re$ious e'itio 'e* e*t e'itio

e!itor"gobase#org
http://gobase.org/studying/articles/matthews/ko/part6/http://gobase.org/studying/articles/matthews/ko/http://gobase.org/studying/articles/matthews/ko/part8/mailto:[email protected]://gobase.org/studying/articles/matthews/ko/part6/http://gobase.org/studying/articles/matthews/ko/http://gobase.org/studying/articles/matthews/ko/part8/mailto:[email protected]

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Charles Matthews - Setpiece Kos, Vol. 7.- Secret Weapons