[Triantafylidis]

Player 1 must show first if the river is check/checked. Since player 2 did not innitiate any action on the river, player 1 must show, ive seen people just muck right away, which usually player 2 would have no problem with because he won the pot. However, if player 1 mucks and player 2 requests to see his hand, it may be flipped as long as it did not hit the mucked cards on the table. (bad etiquette, but it DOES happen)