Chlapik gave Czechia a 1-0 lead at 15:19 of the first period, finishing an odd-man rush with a one-timer in the right face-off circle after a feed from Necas.
Josi tied it 1-1 at 16:53 of the second period. He skated with the puck into the right circle and sent a backhand that went off the skate of Czechia defenseman Radko Gudas and trickled past Dostal.
Meier then gave Switzerland a 2-1 lead with a power-play goal at 18:37, backhanding a rebound in front past Dostal after the goalie made an initial save on Josi’s one-timer.
Radim Simek tied it 2-2 at 6:33 of the third period. Necas collected a loose puck and sent it back to the point, and Simek pounced on a rebound of Chlapik’s redirection in front of the goal crease.
But Pius Suter quickly put Switzerland back in front 3-2 at 8:07 from the edge of the right circle for his second goal of the tournament.
Czechia had what would have been the tying goal waved off at 16:34, when David Pastrnak was ruled to have interfered with Genoni during a power play.
Switzerland played without forward Kevin Fiala, who had surgery and will miss the rest of the Olympics. Fiala was taken from the ice on a stretcher with 2:50 left in the third period after he got tangled up along the boards with Canada forward Tom Wilson on Friday.
