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GM Kosintseva - GM Huschenbeth Pan-American ChampionshipGM Kosintseva - GM Huschenbeth Pan-American ChampionshipGM HuschenbethadvancedWhen to sacrifice a Pawn? | Positional Sacrifice | Advanced Level | GM Arkadij NaiditschWhen to sacrifice a Pawn? | Positional Sacrifice | Advanced Level | GM Arkadij NaiditschChessfactoradvanced