Section 800 - Objection to ruling on challenge for causeA. A defendant may not assign as error a ruling refusing to sustain a challenge for cause made by him, unless an objection thereto is made at the time of the ruling. The nature of the objection and grounds therefor shall be stated at the time of objection.B. The erroneous allowance to the state of a challenge for cause does not afford the defendant a ground for complaint, unless the effect of such ruling is the exercise by the state of more peremptory challenges than it is entitled to by law.