OpenChess

Wesley So checkmates in 13 with 13 chessmen on the board:

8/7R/3p1k2/3P1pp1/7p/1r3B1P/2r3P1/6K1 b - - bm Rb1+;
6Q1/pp2k3/2b1p3/2PpP3/3P4/5N2/8/2n3K1 w - - bm Qg5+;
8/5P1k/p2B3N/1p1P4/7N/6Pp/P4q1K/8 w - - bm Kxh3;

For some reason I get a blank page with fen markers. Are fen tags possible here?

[Event "Chess Supersite Launch"]
[Site "Chess Supersite INT"]
[Date "2016.03.26"]
[Round "2.2"]
[White "Kosteniuk, Alexandra"]
[Black "So, Wesley"]
[Result "0-1"]
[WhiteElo "2553"]
[BlackElo "2773"]
[ECO "B92j"]
[EventDate "2016.03.26"]
[Variation "Sicilian"]
[PlyCount "126"]
[Source "Opening Master"]
[SourceDate "2018.02.12"]
[SourceTitle "OM OTB 201801"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.12"]
[SourceQuality "1"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2 e5 7.Nb3 Be7 8.O-O O-O 9.Re1 Be6 10.Bf3 Nbd7 11.a4 Rc8 12.a5 Rc4 13.Be3 Qc7 14.Nd2 Rc6 15.Nf1 Rc8 16.h3 Qb8 17.Bg5 h6 18.Be3 Bd8 19.Re2 b6 20.axb6 Nxb6 21.Nd5 Nc4 22.b3 Nxe3 23.Ndxe3 a5 24.Ng3 g6 25.c4 Qb4 26.Ra4 Qb6 27.Nd5 Bxd5 28.exd5 R6c7 29.Rea2 Rb7 30.R4a3 Kg7 31.Qa1 Qc5 32.Ne2 Rcb8 33.Nc1 Kh7 34.Nd3 Qc8 35.Bd1 Qf5 36.Qc3 e4 37.Nc1 Bb6 38.Qg3 e3 39.fxe3 Ne4 40.Qf3 Qxf3 41.Bxf3 Bxe3+ 42.Kh2 Bf4+ 43.Kg1 Bxc1 44.Bxe4 Bxa3 45.Rxa3 Rxb3 46.Rxa5 Rc3 47.Ra6 Rxc4 48.Bf3 Rd8 49.Kf2 h5 50.Kg3 h4+ 51.Kf2 Kh6 52.Ke3 Kg5 53.Kd3 Rc7 54.Ra4 f5 55.Ke3 Re8+ 56.Kd2 Rb7 57.Ra6 Rd8 58.Ke3 Rb3+ 59.Kf2 Kf6 60.Ra4 g5 61.Ra7 Rc8 62.Rh7 Rc2+ 63.Kg1 Rb1+ 0-1

[Event "PHI Ch"]
[Site "Tagatay"]
[Date "2004.09.29"]
[Round "17"]
[White "So, Wesley"]
[Black "Garma, Chito"]
[Result "1-0"]
[BlackElo "2415"]
[ECO "C02x"]
[EventDate "2004.09.18"]
[Variation "French: advance, Milner-Barry gambit (6.a3)"]
[PlyCount "73"]
[Source "Opening Master"]
[SourceDate "2018.02.12"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "PHI"]
[SourceTitle "OM OTB 201801"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.12"]
[SourceQuality "1"]

1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Nc6 5.Nf3 Qb6 6.a3 Nh6 7.b4 cxd4 8.cxd4 Nf5 9.Be3 Bd7 10.Bd3 Rc8 11.O-O Be7 12.Nbd2 h6 13.Nb3 g5 14.h3 Qd8 15.Nc5 Bxc5 16.bxc5 Na5 17.g4 Ne7 18.Nd2 Bc6 19.f4 Nc4 20.Qe2 h5 21.fxg5 hxg4 22.hxg4 Kd7 23.Rxf7 Rh3 24.Nf3 Qa5 25.g6 Qc3 26.Rc1 Qxa3 27.Bg5 Re8 28.g7 Rg3+ 29.Kf2 Rxg4 30.Rg1 Rxg1 31.Kxg1 Nb2 32.Rxe7+ Rxe7 33.Bxe7 Nxd3 34.g8=Q Qc1+ 35.Qe1 Kxe7 36.Qxc1 Nxc1 37.Qg5+ 1-0

[Event "8. Grand Slam Masters"]
[Site "Bilbao ESP"]
[Date "2015.10.26"]
[Round "1.1"]
[White "So, Wesley"]
[Black "Ding, Liren"]
[Result "1-0"]
[WhiteElo "2760"]
[BlackElo "2782"]
[ECO "E99"]
[EventDate "2015.10.26"]
[Variation "King's Indian"]
[Annotator "Balogh Csaba"]
[PlyCount "119"]
[Source "ChessPublishing"]
[SourceDate "2002.02.24"]
[WhiteTeamCountry "RUS"]
[BlackTeamCountry "ITA"]

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nc6 8.d5 Ne7 9.Ne1 Nd7 10.Be3 f5 11.f3 f4 12.Bf2 g5 13.Rc1 Ng6 14.c5 Nxc5 15.b4 Na6 16.Nd3 h5 17.Nb5 b6 18.Be1 Rf7 19.Bd2 Bf6 20.Nf2 Qe8 21.Qa4 Bd8 22.Qa3 g4 23.fxg4 hxg4 24.Nc3 Nxb4 25.Qxb4 f3 26.Bb5 Qe7 27.g3 Rh7 28.Qc4 Rh8 29.Qc6 Qh7 30.h3 Rb8 31.Ncd1 a6 32.Qe8+ Kg7 33.Qxd8 Rxd8 34.Rxc7+ Bd7 35.Rxd7+ Rxd7 36.Bxd7 gxh3 37.Kh2 Rb7 38.Be6 Nf8 39.Bf5 Qh5 40.Ng4 Nd7 41.Bh6+ Kh8 42.Nde3 Rc7 43.Bxd7 Rxd7 44.Rxf3 Rf7 45.Rf5 Rxf5 46.exf5 Qf7 47.Bg5 b5 48.Nh6 Qf8 49.f6 Kh7 50.Nef5 Kg6 51.Bh4 e4 52.f7 e3 53.Be7 e2 54.Nh4+ Kh7 55.Bxf8 e1=Q 56.Bxd6 Qf2+ 57.Kxh3 Qf1+ 58.Kg4 Qc4+ 59.Bf4 Qe2+ 60.Nf3 1-0

Solutions:
6Q1/pp2k3/2b1p3/2PpP3/3P4/5N2/8/2n3K1 w - - acd 61; bm Qg5+; c8 "So.0108707.037a.01300"; ce 32742; dm 13; pm Qg5+; pv Qg5+ Kd7 Qxc1 Bb5 Ng5 Kc6 Qa3 a6 Qa5 Kd7 Nf7 b6 Qxb6 Ke7 Qb7+ Bd7 Nd6 Kd8 c6 Bxc6 Qxc6 a5 Qc8+ Ke7 Qe8#;

8/5P1k/p2B3N/1p1P4/7N/6Pp/P4q1K/8 w - - acd 69; bm Kxh3; c8 "So.0012697.057a.00155"; ce 32742; dm 13; pm Kxh3; pv Kxh3 Kg7 f8Q+ Qxf8 Bxf8+ Kxf8 Ng6+ Kg7 d6 Kxg6 d7 Kxh6 Kg4 Kg6 d8Q b4 Qd6+ Kf7 Kg5 Kg7 Qg6+ Kh8 Kf6 b3 Qg7#;

8/7R/3p1k2/3P1pp1/7p/1r3B1P/2r3P1/6K1 b - - acd 53; bm Rb1+; c8 "So.0069351.063b.00829"; ce 32742; dm 13; pm Rb1+; pv Rb1+ Kh2 Rcc1 g4 Rc2+ Bg2 Rbb2 Rh6+ Ke5 Rh7 Rxg2+ Kh1 fxg4 hxg4 Rh2+ Kg1 Kf4 Re7 h3 Rf7+ Kxg4 Rf4+ gxf4 Kf1 Rb1#;