private boolean canJump()
      {
         if(redTurn)
         {
            for(Checker checker: redCheckers)
            {
               if( (checkJumpLeft(checker)) || (checkJumpRight(checker)) )
                  return true;
            }
         }
         else if(!redTurn)
         {
            for(Checker checker: blackCheckers)
            {
               if( (checkJumpLeft(checker)) || (checkJumpRight(checker)) )
                  return true;
            }
         }
         return false;
      
      	
      }