6 , ▁states : ▁ ▁In ▁making ▁up ▁the ▁work ▁before ▁us , ▁it ▁is ▁understood ▁that ▁the ▁great ▁master s ▁above ▁named ▁produced ▁most ▁of ▁their ▁games ▁and ▁examples , ▁by ▁playing ▁them ▁over , ▁experiment ally ▁and ▁repeatedly , ▁with ▁each ▁other ; ▁consult ing ▁upon ▁the ▁moves ▁in ▁committee , ▁and ▁not ing ▁down ▁the ▁details ▁and ▁variations ▁cont ing ent ▁upon ▁each ▁result . ▁The ▁natural ▁consequence ▁of ▁this ▁develop s ▁itself ▁in ▁the ▁practical ▁character ▁of ▁the ▁Tre at ise ; ▁present ing , ▁indeed , ▁fully ▁as ▁much ▁the ▁complex ion ▁of ▁a ▁vast ▁collection ▁of ▁first - rate ▁games , ▁played ▁out , ▁mostly ▁even ▁to ▁the ▁closing ▁Check mate , ▁as ▁that ▁of ▁a ▁general ▁work ▁on ▁the ▁subject ▁of ▁Ch ess . ▁ ▁The ▁work ▁is ▁divided ▁into ▁six ▁chap ters ▁which ▁are ▁in ▁turn ▁sub div ided ▁into ▁sections , ▁games ▁and ▁comments . ▁The ▁first ▁three ▁chap ters ▁treat ▁entire ▁games , ▁in ▁which ▁odd s ▁are ▁supposed ▁to ▁be ▁given ; ▁the ▁fourth ▁chapter ▁is ▁devoted ▁to ▁the ▁consideration ▁of ▁" even " ▁games ▁( no ▁hand ic ap ); ▁the ▁fifth ▁concerns ▁the ▁end game ▁and ▁the ▁sixth ▁consists ▁of ▁a ▁selection ▁of ▁critical ▁situations ▁from ▁St amma , ▁upon ▁which ▁Pon z iani ▁sar cast ically ▁remarked : ▁ ▁i ▁quali ▁sono ▁tutti ▁di ▁Fil ipp o ▁St amma ; ▁quando ▁av reb bero ▁pot uto ▁più ▁pla us ibil mente ▁cav ar li ▁dal ▁proprio ▁fond o ▁(