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1、ChapterTenExtensionsandInvasionPoints149PartFourVitalPointsandShapeintheOpening150ShapeUp!ChapterTenExtensionsandInvasionPoints151ChapterTenExtensionsandInvasionPoints10.1Thetwo-pointextensionisstableThisextensionwithatwo-pointgapisthefundamentalbuildingbloc
2、kforplayonthesides.Muchoftheordinaryreasoningaboutfindingabaseforgroupsintheopeningcentresonextendinginthisway.Ofallthewaystoconstructatwo-stonegroupontheside,thisoneisthemoststable.Weshallseeintherestofthischapterhoweachoftheothermembersofthefamilyofcommone
3、xtensionshassomedrawback.Thatbynomeanssaysthatthetwo-pointextensionistheonlyshapeyouneedtoknow.Insomecasesyoucanplaylowmoves,withaneyetogettingimmediatelife.Onotheroccasionsoverallstrategydictatestheuseofplaysonthefourthline,climbingquicklytopivotalorfocalpo
4、ints.Thefeaturethatwebringoutinthischapteristheexistenceofinvasionpoints,vitalpointsofshapewhereaninvasionispossible(ormaybecomepossiblelater).Thereissomediscussionin13.7ofthequestionofwhethersuchinvasionsinsmallspacesareworthwhile.Thetwo-pointextensionisnot
5、exemptfromattackitself.WeconsiderthistopicinChapter11.152ShapeUp!10.2Thethree-pointextension5631274Thethree-pointextensiononthethirdlineisusefulinthissortofsituation.Blackbuildsasecuregroup.9523A71486Consideredonitsown,thethree-pointextensionisalightshape,th
6、atis,onethatmaybedefendedbysacrificialmeans.ThereisaninvasionpointatA.(Right)Dependingonthecontext,Blackcanusuallycopethisway,givinguponestone.3412756Inprofessionalgo,thesequenceatthetopofthepagewouldbethoughttolackseveritybyWhite.InsteadoneexpectstoseeWhite
7、invadeatonce,andthengiveuptheinvasionstoneforthemoment,ashere.Ithasverygoodchancesoflaterrevival,unlessBlackplaysoncemoretosuppressit.ChapterTenExtensionsandInvasionPoints15310.3Onthethirdandfourthlines1A3xx2xxxInstrategicterms(left),Black3hasthemeaningofmak
8、ingtheplaysatthe‘x’pointslessimportant.Thatis,itworksagainstcentralstrategy.Consideredinisolation,theshapehasaninvasionpointatA.51342WhenthemarkedWhitestoneispresent,itisnormallypossibletoinvade
