The pairings for Round 12 are listed below. The first player listed is White.
The player's score at the beginning of the round is in parentheses.

(89) Mieses - Hodges, Sicilian Defense [B30]
1.e4 c5 2.Nc3 e6 3.Nf3 Nc6 4.Bb5 a6 5.Bxc6 bxc6 6.d3 d5 7.0-0 Qc7 8.Qe2 Be7 9.e5 a5 10.Na4 Ba6 11.c4 h5 12.b3 Nh6 13.Ba3 Qa7 14.cxd5 cxd5 15.Qc2 0-0 16.Rac1 Rfc8 17.Bxc5 Bb5 18.Bxa7 Rxc2 19.Rxc2 Bxd3 20.Rc7 Bd8 21.Rb7 Bxf1 22.Kxf1 1-0

(90) Lawrence - Schlechter, Sicilian Defense [B23]
1.e4 c5 2.Nc3 e6 3.g3 d5 4.Bg2 Nf6 5.d3 Be7 6.Nge2 Nc6 7.0-0 d4 8.Nb1 h5 9.h3 e5 10.f4 Bd7 11.Nd2 Qc8 12.f5 g6 13.fxg6 fxg6 14.Nc4 Qc7 15.Bg5 0-0 16.Qd2 b5 17.Na3 Qa5 18.Qc1 Nh7 19.Bh6 Rxf1+ 20.Bxf1 g5 21.c4 b4 22.Nc2 Qc7 23.h4 gxh4 24.Qd2 Kh8 25.Ne1 Rg8 26.Kh2 Qd6 27.gxh4 Rg6 28.Bg5 Nxg5 29.hxg5 Bxg5 30.Qc2 Qf6 31.Bg2 Qf2 32.Ng1 Bf4+ 33.Kh1 Qh4+ 0-1

(91) Chigorin - Napier, Sicilian Defense [B25]
1.e4 c5 2.Nc3 Nc6 3.Nf3 g6 4.g3 Bg7 5.Bg2 d6 6.d3 Nf6 7.0-0 h5 8.Bf4 Bg4 9.Qd2 Nd7 10.Nd5 Bxf3 11.Bxf3 Nde5 12.Bg2 e6 13.Nc3 h4 14.Bg5 f6 15.Be3 Qe7 16.h3 0-0-0 17.f4 Nf7 18.g4 Rhe8 19.Qf2 Kb8 20.Qxh4 d5 21.exd5 exd5 22.Rae1 g5 23.Qf2 d4 24.Bxd4 Nxd4 25.Rxe7 Rxe7 26.Ne4 f5 27.gxf5 Nxf5 28.c3 Rxd3 29.Qxc5 N7d6 30.Nxd6 Nxd6 31.Qxg5 Bf8 32.Qa5 Re8 33.Qa4 Rd2 34.Qd7 Bh6 35.Rf2 Re1+ 36.Kh2 a6 37.h4 Ne4 38.Rxd2 Bxf4+ 39.Kh3 Re3+ 40.Kg4 Nf6+ 41.Kxf4 Nxd7 42.Kxe3 1-0

(92) Lasker - Teichmann, Petroff Defense [C42]
1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.Qe2 Qe7 6.d3 Nf6 7.Bg5 Qxe2+ 8.Bxe2 Be7 9.Nc3 Bd7 10.0-0-0 Nc6 11.Rhe1 0-0 12.d4 Ng4 13.Bxe7 Nxe7 14.Bb5 Bxb5 15.Rxe7 Ba6 16.Rxc7 Nxf2 17.Re1 Rfe8 18.Ree7 Rxe7 19.Rxe7 Rd8 20.Ng5 Ng4 21.h3 Nf6 22.b4 Bf1 23.Rxb7 Ra8 24.g3 Bg2 25.Re7 Rc8 26.Nb5 Nd5 27.Re2 Bf1 28.Nxd6 Bxe2 29.Nxc8 Nxb4 30.a3 Nd5 31.Nd6 f6 32.Ne6 Bf1 33.h4 Bh3 34.Nf4 Nxf4 35.gxf4 Kf8 36.Kd2 Ke7 37.Ne4 Ke6 38.c4 1-0

(93) Fox - Marco, Ruy Lopez [C79]
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 d6 6.Re1 b5 7.Bb3 Na5 8.Nc3 Nxb3 9.axb3 Bb7 10.d4 Nd7 11.Bg5 f6 12.Bd2 g6 13.Qe2 Bg7 14.dxe5 dxe5 15.Rad1 0-0 16.Be3 Rf7 17.Rd2 Qe8 18.Red1 Nf8 19.b4 Ne6 20.Qd3 Bf8 21.Nd5 Rd8 22.Qb3 Kg7 23.h3 c6 24.Nc3 Rxd2 25.Rxd2 Rd7 26.Rxd7+ Qxd7 27.Ne1 c5 28.bxc5 Nxc5 29.Bxc5 Bxc5 30.Nd3 Bd4 31.Qb4 Qc7 32.Ne2 Bb6 33.Ng3 Kf7 34.Qd2 a5 35.h4 Kg7 36.h5 Bc8 37.h6+ Kf7 38.Qe2 Be6 39.Kh2 Qd6 40.Qf3 a4 41.Ne2 b4 42.g4 Bc4 43.Nec1 a3 44.b3 Bxd3 45.cxd3 Qc5 46.Na2 Qxf2+ 47.Qxf2 Bxf2 48.Nxb4 Be3 49.Kg2 Bxh6 50.Kf3 Bf8 51.Na2 Bc5 52.Ke2 h5 53.gxh5 gxh5 54.Kf3 Kg6 55.b4 Bd4 56.Kg3 f5 57.exf5+ Kxf5 58.Kf3 Ke6 59.Ke4 Kd6 60.Kf5 Kc6 61.Kg5 Kb5 62.Kxh5 Ka4 63.Nc1 Kxb4 0-1

(94) Barry - Showalter, Ruy Lopez [C91]
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.a4 Bg4 9.c3 0-0 10.d4 Bxf3 11.gxf3 Qd7 12.f4 Qh3 13.f3 Na5 14.Bc2 Nh5 15.fxe5 dxe5 16.Qe2 Rfb8 17.Qf1 Qh4 18.Re2 Nf4 19.Bxf4 exf4 20.Bd3 b4 21.Nd2 Rb6 22.Rg2 c5 23.Nc4 Nxc4 24.Bxc4 cxd4 25.cxd4 a5 26.b3 Rd8 27.d5 Bc5+ 28.Kh1 Rh6 29.Rd1 Bd6 30.Rdd2 Re8 31.Rg4 Qh5 32.Rgg2 f5 33.Bd3 fxe4 34.Bxe4 Kf8 35.Rc2 ½-½

(95) Pillsbury - Janowsky, Queen's Gambit Declined, Albin Counter-Gambit [D08]
1.d4 d5 2.c4 e5 3.dxe5 d4 4.Nd2 Nc6 5.Ngf3 Be6 6.a3 Qd7 7.Nb3 0-0-0 8.e3 d3 9.Nbd4 Bc5 10.Nxc6 Qxc6 11.Bxd3 Ne7 12.Qc2 Rxd3 13.Qxd3 Rd8 14.Qc3 Bg4 15.Ke2 Ng6 16.Rd1 Rxd1 17.Kxd1 Nh4 18.Kc2 Nxg2 19.Nd4 Qe4+ 20.Kb3 Ne1 21.Bd2 Nf3 22.Nxf3 Qxf3 23.Ka2 Be6 24.b4 Be7 25.Kb2 Qxf2 26.Rc1 Qxh2 27.Qd4 f6 28.Qd3 fxe5 29.Rc2 Bf6 30.Bc3 Qh3 31.Rd2 a6 32.c5 Kb8 33.c6 Bf5 34.Qd5 Qxe3 35.Qg8+ Ka7 36.cxb7 Kxb7 37.Qd5+ Kb8 38.Qg8+ Bc8 39.Qxh7 e4 40.Rc2 Bxc3+ 41.Rxc3 Qd2+ 42.Rc2 Qd4+ 43.Rc3 Qe5 44.Qh4 e3 45.Qe1 e2 46.Kc2 Bf5+ 47.Kd2 Qd4+ 48.Kxe2 g5 49.Qg3 Bg4+ 50.Kf1 Qd1+ 51.Qe1 Qd8 52.Kg1 Bc8 53.Re3 Qd4 54.Qc3 Qg4+ 55.Kf2 Qh4+ 56.Ke2 Bd7 57.Kd2 Bb5 58.Kc1 Qf4 59.Qd2 Kb7 60.Kb2 g4 61.Qd5+ Bc6 62.Qe5 Qf2+ 63.Re2 Qf1 64.Rc2 Qd1 65.Qg7 Qf3 66.Rc3 Qf2+ 67.Rc2 Qf4 68.Re2 g3 69.Qe5 Qg4 70.Rc2 g2 71.Qc3 Qg6 72.Rxg2 Qxg2+ 73.Kc1 Qf3 74.Kb2 Qxc3+ 75.Kxc3 Kb6 76.Kc4 Ba4 77.Kd4 Kb5 78.Kc3 Bd1 0-1
Most electronic sources give 49.Qf2. The actual move was 49.Qg3 as now shown above. This error was identified on Chessgames.com.

(96) Marshall - Delmar, Dutch Defense [A85]
1.d4 e6 2.c4 f5 3.Nc3 Nf6 4.Bg5 Be7 5.e3 0-0 6.Bd3 Ne4 7.Bxe7 Qxe7 8.Bxe4 fxe4 9.Nxe4 d5 10.cxd5 exd5 11.Nd2 Qg5 12.Ngf3 Qxg2 13.Rg1 Qh3 14.Rg3 Qh6 15.Qb3 Nc6 16.Qxd5+ Be6 17.Qg5 Qxg5 18.Nxg5 Bf5 19.Rc1 h6 20.Ngf3 Rf7 21.a3 Re8 22.Nc4 Be4 23.Nce5 Nxd4 24.Nxf7 Nxf3+ 25.Ke2 Bc6 26.Nxh6+ Kh7 27.Nf5 g6 28.Rxf3 gxf5 29.Rxf5 Kg6 30.Rf4 1-0