The narrator really needs to go somewhere else -_- Was really irritating this episode. However, let's see a show of hands for the people who knew his plan was going to go wrong some how. Let's see don't be shy *raises hand*
Spoiler or not...i find it personally disrespectful that people spew those out since it loses the appeal and grasp that an anime can give us. Please, to everyone...no more spoilers. I'm not a mod but i don't want my series spoiled, ok?
i'm guessing the chairman drew the lot that kaiji had hidden, then flipped it over to look like a blank. when the second winning lot is drawn, he'll flip it over.
I believe the chairman took the winning slot when it was being put in the box, but because they are two winning slots kaiji takes the remaining one just by pure luck.