The Czechs won a game on board 24. They now lead 4-2.
E13 Queen's Indian Defense
1.d4 e6 2.c4 Nf6 3.Nf3 b6 4.Bg5 h6 5.Bxf6 Qxf6 6.e3 Bb4+ 7.Nc3 Bxc3+ 8.bxc3 0-0 9.Bd3 Bb7 10.0-0 d6 11.Nd2 Qe7 12.Qc2 c5
White's last move is new.
D38 Queen's Gambit
1.Nf3 d5 2.d4 Nf6 3.c4 e6 4.cxd5 exd5 5.Nc3 Bb4 6.Bg5 0-0 7.Qb3 Bxc3+ 8.bxc3 c6 9.e3 b6 (N) 10.Bd3 Ba6 11.Bxa6
"If 11...Nxa6 then 12.Ne5" was attached.
PGN of all the CZE-USA games