If you're interested, there were some great discussions on 2+2 several years ago about this very topic. One of the guys there who I used to know had an extensive collection of poker rulebooks from the late 19th and early 20th centuries, and provided a lot of images from these books in making his arguments.
The discussion spreads across a few threads, but you can Google "palimax IWTSTH" and you should find most of them.
Schmendr1ck - Thank you, I enjoyed!!!
Reading the discussion, The Palimax was saying it was an integral part of the game, a flush beats a straight, IWTSTH, there is a small blind and a big blind, its all just part of the game. He also does cite Robert, and calls out the term
Showdown however in today's game, I hear 'the river' or at the river, meaning concluding a hand as opposed to
the showdown. - BECAUSE ... its no longer a showdown, and dare I say no one reading this or that is alive today that avidly plays poker has ever played in a game where everyone in the hand post river betting turns the hand face up every hand.
Others tried to say it was in bad form and its only there to piss others off, The Palimax seemed to be trying to stay on point that it shouldn't be taken out of the game because it is a part of it.
I think as you'll see in the quotation below, its a vestigial of a game we play today. With a global community vying for a standardization, it should be clarified, but is very difficult.
The problem of why people are on both sides of the fence is this (or so I think): It would cause more drama to force a player to say, I think he is cheating please check his cards. This is substantially worse than saying IWTSTH, for the game. When someone asks WHY? it would be better form to cite the rule allows me to than, again I think he is cheating.
It is where it needs to be, if a player is called on the river, they should show their hand. If the other contestants (of the pot, all of them) are content the better (aggressor) is not cheating, then mucking is fine, otherwise the caller(s) should wait in order to expose or table the hand.
Originally Posted by Bob Ciaffone, in an email conversation, April 28, 2010
[Matt S.]Can you elaborate on, “The law has always been that all hands must be shown”? I understand that the rules of the game of poker have always included that, but it seems no casino’s rulebook says that – including your own set of rules.
[Bob Ciaffone][T]he players in the game have the right to see the contents of all the hands that were live at the showdown. That was the rule since I started playing poker at age 9 in my mother’s poker circle back in 1950 and has been the rule ever since in every game I have played in. You can make the winner show his hand by not giving him the pot until he does show. Left unanswered is how to see a losing hand if a player does not want to show it. The dealer will not show a losing hand or ask the player to show a losing hand, for several good reasons. We do not want it to become a winning hand is one reason. We do not want a weak player to be annoyed or embarassed [sic] by having his hand shown. So a player must ask. This was the rule and remains the rule. What to do if a player asks and what to do if the player is uncooperative and what to do if the hand is already in the muck are the parts of the rule that are not defined.
[Matt S.]
And do you know of any resource to obtain a copy of a any casino’s actual poker rulebook – the older the better?
[Bob Ciaffone] No.
I want to point out, I think Bob falls victim as we all do to perception, he says 'has been the rule ever since in every game I have played in' but I think this is more his perception than actuality, and I'm guessing he has seen IWTSTH enforced as often as the average of US have.