private boolean jumpingEnemy(Move m) {
        int dx = (m.getCol1() - m.getCol0()) / m.length();
        int dy = (m.getRow1() - m.getRow0()) / m.length();
        for (int i = 1; i < m.length(); i++) {
            if (_contents[m.getRow0() + i * dy - 1][m.getCol0() + i * dx - 1].
                    side() == turn().opponent()) {
                return true;
            }
        }
        return false;
    }