Proofread the following extract and correct any errors in verb tenses.
Correct the two errors in these paragraph:
Foryears,Gowasconsideredthelastredoubtagainstthemarchofcomputers.Machinesmightwinatchess,draughts,Othello,three-dimensionalnoughtsandcrosses,Monopoly,bridgeandpoker.Go,though,isdifferent.
Thegamerequiredintuition,strategisingandcharacterreading,alongwithvastnumbersofmovesandpermutations.Accordingtolegend,itwasinventedbyaChineseemperortoteachhissubjectsbalanceandpatience:qualitiesuniquetohumanintelligence.
