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This is regarding a Texas Holdem No Limit home game.
Player 2 has the highest hand.
What happens in this situation?
Because Player 1 made the final raise, he should be the first to show his cards when players reach the showdown. However, according to the World Series Of Poker rules,
When a player holds a hand that is likely the winner, they should show that hand immediately to speed play.
In this case, it appears Player 2, in an effort to speed up play, short-cutted the word "call" and went straight into the showdown. Showing your hand in response to a shove (an all-in raise) is definitely considered a call by poker pros.
When there are only two players left, player 2 showing his hand hurts him and no one else. Thus you can just ask him to make an official move (i.e. actually call), and then proceed with the game. This would work even if the previous bid wasn't All In - player 1 could continue playing with full knowledge of player 2's hand, and player 2 has only himself to blame.
If there are more than two players left, however, showing your hand is unacceptable because it tells the remaining players things about each others' hands (i.e. which cards the others are not holding).
It depends on the board and how strict you want to be. Since it's a home game, it's probably informal and you wouldn't be sticklers for the rules, and count it as a call (or ask to clarify). If the full house is the nuts, then that would also be justification for considering it a call. But if Player 2 has the worst full house the board allows, or if the board allowed a straight flush, and Player 1's betting pattern implies one of the better hands, then some skepticism as to whether Player 2 intended to call is warranted.
