[TStoneMBD]

you're right that allowing people to show cards makes it easier for people to collude in tournaments and chip dump.

the counterarguement to this of course is that people who collude like this in tournaments would set up signals anyway.

however, allowing this rule allows colluders to justify their collusion. ie, a friend of the chip leader is on the bubble and to help his buddy out, the chip leader shows his hand after going allin to give his buddy the chance to double up if ahead or fold if behind. when players accuse the leader of collusion he can simply say that he didn't break any rules, showing cards is allowed. it shouldn't be the tc's responsibility to determine if this is collusion as the chip leader could just lie about his intent of showing his card(s).

I think the current rule is the right one. I see no practical reason for why "pros" need to show other players their cards midhand.