impact city roller derby icrd fast pace board game player base flat track roller derbygame play move team roller derby girl board try jammer pass oppose derby girl opponent jammergame minute hour play possible jam game use strategic movement player pass block oppose player variety dice d d d d determine success key move dice rolling keep minimum turn normally move player require dice rollsin addition lap track coach ie hand special card option special offensive defensive play straight normal flat track derby play like leg whip hip check foul card allow risk break rule team key advantage referee catch send penalty boxgame play keep true rule sport flat track roller derby try game fast pace fun

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