▁" res cu ed " ▁from ▁their ▁designated ▁j ail ▁by ▁one ▁of ▁the ▁other ▁members ▁of ▁the ▁team . ▁F allen ▁flags ▁remain ▁where ▁they ▁dropped ▁until ▁a ▁time - out ▁period ▁el aps es , ▁after ▁which ▁the ▁flag ▁returns ▁to ▁one ▁of ▁several ▁starting ▁locations ▁in ▁home ▁territory . ▁The ▁ 2 D ▁map ▁also ▁features ▁walls , ▁trees ▁and ▁a ▁moving ▁river , ▁en abling ▁a ▁wide ▁variety ▁of ▁strateg ies . ▁Special ▁locations ▁in ▁the ▁play ▁area ▁allow ▁humans ▁to ▁query ▁the ▁game ▁state ▁( such ▁as ▁flag ▁status ) ▁using ▁binary ▁messages . ▁ ▁In ▁ 1 9 9 2 , ▁Richard ▁Car r ▁released ▁an ▁MS - D OS ▁based ▁game ▁called ▁Capt ure ▁the ▁Flag . ▁It ▁is ▁a ▁turn - based ▁strategy ▁game ▁with ▁real ▁time ▁network ▁/ ▁mode m ▁play ▁( or ▁play - by - mail ) ▁based ▁around ▁the ▁traditional ▁out door ▁game . ▁The ▁game ▁required ▁players ▁to ▁merely ▁move ▁one ▁of ▁their ▁characters ▁onto ▁the ▁same ▁square ▁as ▁their ▁oppon ent ' s ▁flag , ▁as ▁opposed ▁to ▁bringing ▁it ▁back ▁to ▁friendly ▁territory , ▁because ▁of ▁difficulties ▁implementing ▁the ▁artificial ▁intelligence ▁that ▁the ▁computer ▁player ▁would ▁have ▁needed ▁to ▁bring ▁the ▁enemy ▁flag ▁home ▁and ▁intercept ▁oppos ing ▁characters ▁carrying ▁the ▁flag . ▁ ▁Computer ▁security ▁ ▁In ▁computer ▁security , ▁Capt ure ▁the ▁Flag ▁( CT F ), ▁a ▁type ▁of ▁w arg ame , ▁is ▁a ▁computer ▁security ▁competition . ▁C TF ▁cont ests ▁are ▁usually