In the bottom layer of Agent2D, single defensive and offensive methods often fail to complete the offensive and defensive tasks required by a game. In response to this problem, this study proposes a multiplayer defensive strategy and a triangle offensive strategy. The multiplayer defensive strategy is when the opponent is on the offense, we send two or more teammates to force the opponent’s team player with the ball. The triangle offensive strategy is realized through the running cooperation of three teammates in suitable positions. A core offensive player and two auxiliary offensive players form a triangle offensive team. The two strategies are applied to teams and experimented on the RoboCup2D simulation platform. The experimental results verify the effectiveness of the two strategies, with the teams using the two strategies all having improved winning rates and defensive and offensive efficiencies.