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Player Profile

Player:

(Eg: Carlsen,Magnus)

Tian, Tian



FIDE:	FIDE Card
Title:	WGM
Years:	1997-2018
Number of games:	249
Number of wins:	96
Number of draws:	78
Number of losses:	75
White score:	73½/128 (57.42% - Average Elo: 2218.03)
Black score:	61½/121 (50.83% - Average Elo: 2249.23)

Rating progression

Games
White wins
White draws
White losses
Black wins
Black draws
Black losses

Top wins

Tian, Tian (2224) - Anka, Emil (2425), Budapest FS02 IM-A, Budapest (B25) - 2001

Tian, Tian (2235) - Gu, Xiaobing (2361), All China Games 4th, Hefei (B23) - 2010

Tian, Tian (2302) - Nemeth, Zoltan (2319), Budapest FS04 IM-B, Budapest (B24) - 2001

Moser, Eva (2371) - Tian, Tian (2311), Wch U20 Girls 19th, Goa (A07) - 2002

Jurkovic, Ante (2349) - Tian, Tian (2224), Budapest FS02 IM-A, Budapest (A07) - 2001

Gara, Ticia (2348) - Tian, Tian (2355), HUN tt U20, Budapest (B14) - 2001

Tian, Tian - ? (107)

Kahn, Evarth (2/5)

Eperjesi, Laszlo (3½/4)

Kaposztas, Miklos (1/2)

Khechumyan, Gagik (1½/2)

Koczo, Kristof (2/2)

Nemeth, Zoltan (1/2)

Rajlich, Vasik G (1/2)

Sendur, Adnan (1/2)

Szirmai, Eduard (1/2)

Babic, Marijana (1/1)

Bacrot, Nathalie (1/1)

Boor, Carl Brandon (0/1)

Bordas, Gyula (0/1)

Brustkern, Juergen (½/1)

Cai, Jiaying (0/1)

Cai, Jinru (1/1)

Chu, Stefanie (½/1)

Cmiel, Thorsten (½/1)

Costantino, Rosario (1/1)

Erdelyi, Zombor (1/1)

Farhat, Barbara (1/1)

Fordan, Tibor (1/1)

Forgo, Eva (0/1)

Franchini, Gabriele (1/1)

Jamrich, Gyorgy (½/1)

Jurkovic, Ante (0/1)

Karavade, Eesha (1/1)

Kavitha, JE (1/1)

Koneru, Humpy (0/1)

Kosintseva, Nadezhda (½/1)

Kosintseva, Tatiana (0/1)

Kovacs, Robert (0/1)

Kudrin, Sergey (0/1)

Li, Wenliang (0/1)

Liang, Xiaoning (1/1)

Lin, Chen (0/1)

Magyar, Otto (½/1)

Majeric, Zoran (½/1)

Mensch, Etienne (0/1)

Mikrut, Dariusz (0/1)

Nakhapetiane, Pogos (0/1)

Neber, Akos (½/1)

Nguyen, Viet Tuong (½/1)

Nie, Xin (½/1)

Ning, Kaiyu (½/1)

Orso, Janos (0/1)

Ostrovsky, Alexander (0/1)

Paci, Cedric (1/1)

Petran, Pal (½/1)

Priyadarshini, M (1/1)

Radnai, Adam (1/1)

Resika, Nathan A (1/1)

Revesz, Zoltan (1/1)

Rozsnyai, Tamas (1/1)

Ruan, Lufei (0/1)

Sachdev, Tania (½/1)

Sergeyeva, Maria (1/1)

Sipos, Istvan (0/1)

Stancil, Kimani A (1/1)

Szeberenyi, Adam (½/1)

Szirti, Almos (0/1)

Tong, Li Da (1/1)

Van den Brande, Werner (0/1)

Vijayalakshmi, Subbaraman (0/1)

Wijesuriya, G Vineetha (1/1)

? - Tian, Tian (108)

Farago, Sandor (2½/3)

Hajnal, Zoltan (0/3)

Dembo, Yelena (1/2)

Eperjesi, Laszlo (1½/2)

Galyas, Miklos (½/2)

Kaposztas, Miklos (2/2)

Philippe, Christophe (1/2)

Rajlich, Vasik G (0/2)

Appleberry, Martin (½/1)

Ashok, Koneru (1/1)

Bacsi, Andras (1/1)

Balogh, Viktor (½/1)

Bayartsetseg, T (1/1)

Bencze, Laszlo (0/1)

Berczes, Csaba (½/1)

Bodrogi, Mihaly (1/1)

Braun, Marton (0/1)

Brustkern, Juergen (1/1)

Cai, Boheng (0/1)

Charkhalashvili, Inga (0/1)

Cmilyte, Viktorija (0/1)

Coimbra, Margarida Goncalves (1/1)

Corker, Kerry (1/1)

Csapo, Zoltan (1/1)

Dang, Bich Ngoc (½/1)

Ding, Linlin (1/1)

Ding, Yixin (1/1)

Dudas, Janos (0/1)

Erdelyi, Zombor (1/1)

Francsics, Endre (0/1)

Harika, Dronavalli (0/1)

Jamrich, Gyorgy (0/1)

Khusnutdinova, Luiza (0/1)

Kis, Lorand Bela (1/1)

Koskinen, Henri (½/1)

Matras Clement, Agnieszka (1/1)

Mohota, Nisha (1/1)

Moser, Eva (1/1)

Naes, Flovin Tor (0/1)

Nagy, Zoltan (0/1)

Nemeth, Zoltan (½/1)

Nguyen, Thi Thanh An (1/1)

Prosviriakov, Vladimir (½/1)

Rebers, Eugene H (0/1)

Reiss, Tibor (1/1)

Resika, Nathan A (0/1)

Roberts, Paul (½/1)

Ruan, Lufei (½/1)

Sergeev, A (½/1)

Somogyi, Istvan (½/1)

Sun, Yinan (½/1)

Suranyi, Pal (1/1)

Szeberenyi, Adam (½/1)

Tessedik, Karoly (1/1)

Thipsay, Bagyashree Sathe (0/1)

Tornai, Imre (½/1)

Ubiennykh, Ekaterina (0/1)

Vajda, Szidonia (½/1)

Van den Brande, Werner (½/1)

Vuilleumier, Alexandre (½/1)

Openings played as White (45)

B26 Sicilian, Closed, 6.Be3 (1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.Be3)
Average Elo: 2218.89
Result: 10½/21 = 50%

C54 Giuoco Piano (1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4)
Average Elo: 2243.38
Result: 5½/9 = 61.11%

B25 Sicilian, Closed (1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6)
Average Elo: 2266.12
Result: 5½/8 = 68.75%

B07 Pirc (1.e4 d6 2.d4 Nf6)
Average Elo: 2095.57
Result: 5½/7 = 78.57%

B24 Sicilian, Closed (1.e4 c5 2.Nc3 Nc6 3.g3)
Average Elo: 2272
Result: 2½/6 = 41.67%

B22 Sicilian, Alapin (1.e4 c5 2.c3)
Average Elo: 2229.25
Result: 4/5 = 80%

B06 Robatsch (1.e4 g6)
Average Elo: 2195.5
Result: 2½/5 = 50%

B23 Sicilian, Closed (1.e4 c5 2.Nc3)
Average Elo: 2299.75
Result: 1/4 = 25%

B04 Alekhine's Defense, Modern (1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3)
Average Elo: 2319.25
Result: 0/4 = 0%

C00 French Defense (1.e4 e6)
Average Elo: 1851.25
Result: 3/4 = 75%

B12 Caro-Kann Defense (1.e4 c6 2.d4)
Average Elo: 2268.33
Result: 3/3 = 100%

B30 Sicilian (1.e4 c5 2.Nf3 Nc6)
Average Elo: 2161.67
Result: 2/3 = 66.67%

Uncommon Opening (1.g4, a3, h3, etc.)
Average Elo: 2068
Result: 3/3 = 100%

C42 Petrov Defense (1.e4 e5 2.Nf3 Nf6)
Average Elo: 2299.67
Result: 1½/3 = 50%

B17 Caro-Kann, Steinitz Variation (1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7)
Average Elo: 2222.33
Result: 1½/3 = 50%

C55 Two Knights Defense (1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6)
Average Elo: 2281.33
Result: 2/3 = 66.67%

C01 French, Exchange (1.e4 e6 2.d4 d5 3.exd5 exd5 4.Nc3 Nf6 5.Bg5)
Average Elo: 2311.67
Result: 1½/3 = 50%

C16 French, Winawer (1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5)
Average Elo: 2219.5
Result: 1/2 = 50%

C18 French, Winawer (1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3)
Average Elo: 2130
Result: 1½/2 = 75%

C41 Philidor Defense (1.e4 e5 2.Nf3 d6)
Average Elo: 2338.5
Result: ½/2 = 25%

B31 Sicilian, Rossolimo Variation (1.e4 c5 2.Nf3 Nc6 3.Bb5 g6)
Average Elo: 2207
Result: 1/2 = 50%

C50 Giuoco Piano (1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5)
Average Elo: 2332.5
Result: ½/2 = 25%

B01 Scandinavian (1.e4 d5)
Average Elo: 2157.5
Result: 1½/2 = 75%

B21 Sicilian, 2.f4 and 2.d4 (1.e4 c5 2.f4)
Average Elo: 2199
Result: 1/1 = 100%

B50 Sicilian (1.e4 c5 2.Nf3 d6)
Average Elo: 2310
Result: 1/1 = 100%

B00 Uncommon King's Pawn Opening (1.e4)
Average Elo: 2186
Result: 0/1 = 0%

B02 Alekhine's Defense (1.e4 Nf6)
Average Elo: 2292
Result: ½/1 = 50%

C19 French, Winawer, Advance (1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3 Ne7)
Average Elo: 2212
Result: 1/1 = 100%

B76 Sicilian, Dragon, Yugoslav Attack (1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 O-O)
Average Elo: 2113
Result: 1/1 = 100%

C17 French, Winawer, Advance (1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5)
Average Elo: 2059
Result: 1/1 = 100%

B40 Sicilian (1.e4 c5 2.Nf3 e6)
Average Elo: 2159
Result: 1/1 = 100%

B41 Sicilian, Kan (1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6)
Average Elo: 2355
Result: ½/1 = 50%

C11 French (1.e4 e6 2.d4 d5 3.Nc3 Nf6)
Average Elo: 2349
Result: 0/1 = 0%

B05 Alekhine's Defense, Modern (1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 Bg4)
Average Elo: 2284
Result: 0/1 = 0%

B32 Sicilian (1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e5)
Average Elo: 2273
Result: 1/1 = 100%

B82 Sicilian, Scheveningen (1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.f4)
Average Elo: 0
Result: 1/1 = 100%

A04 Reti Opening (1.Nf3)
Average Elo: 2448
Result: 0/1 = 0%

B29 Sicilian, Nimzovich-Rubinstein (1.e4 c5 2.Nf3 Nf6)
Average Elo: 2337
Result: ½/1 = 50%

C85 Ruy Lopez, Exchange Variation Doubly Deferred (DERLD) (1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Bxc6 dxc6)
Average Elo: 2078
Result: ½/1 = 50%

B14 Caro-Kann, Panov-Botvinnik Attack (1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 e6)
Average Elo: 2097
Result: 1/1 = 100%

B27 Sicilian (1.e4 c5 2.Nf3)
Average Elo: 2257
Result: 0/1 = 0%

C48 Four Knights (1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5)
Average Elo: 2303
Result: ½/1 = 50%

E38 Nimzo-Indian, Classical, 4...c5 (1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5)
Average Elo: 2303
Result: ½/1 = 50%

C10 French (1.e4 e6 2.d4 d5 3.Nc3)
Average Elo: 2154
Result: 1/1 = 100%

B13 Caro-Kann, Exchange (1.e4 c6 2.d4 d5 3.exd5 cxd5)
Average Elo: 1946
Result: 0/1 = 0%

Openings played as Black (55)

B17 Caro-Kann, Steinitz Variation (1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7)
Average Elo: 2218.91
Result: 4/11 = 36.36%

B12 Caro-Kann Defense (1.e4 c6 2.d4)
Average Elo: 2268
Result: 7/11 = 63.64%

B13 Caro-Kann, Exchange (1.e4 c6 2.d4 d5 3.exd5 cxd5)
Average Elo: 2222.12
Result: 4/8 = 50%

B90 Sicilian, Najdorf (1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6)
Average Elo: 2275.83
Result: 1½/6 = 25%

B19 Caro-Kann, Classical (1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Bf5 5.Ng3 Bg6 6.h4 h6 7.Nf3 Nd7)
Average Elo: 2255.8
Result: 1/5 = 20%

E18 Queen's Indian, Old Main line, 7.Nc3 (1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.Nc3)
Average Elo: 2341.25
Result: 2½/4 = 62.5%

E12 Queen's Indian (1.d4 Nf6 2.c4 e6 3.Nf3 b6)
Average Elo: 2375.75
Result: 1½/4 = 37.5%

D07 Queen's Gambit Declined, Chigorin Defense (1.d4 d5 2.c4 Nc6)
Average Elo: 2249.33
Result: ½/3 = 16.67%

B14 Caro-Kann, Panov-Botvinnik Attack (1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 e6)
Average Elo: 2318.67
Result: 2/3 = 66.67%

E19 Queen's Indian, Old Main line, 9.Qxc3 (1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.Nc3 Ne4 8.Qc2 Nxc3)
Average Elo: 2283
Result: 1/3 = 33.33%

D11 Queen's Gambit Declined Slav (1.d4 d5 2.c4 c6 3.Nf3)
Average Elo: 2199.67
Result: 2½/3 = 83.33%

B10 Caro-Kann (1.e4 c6)
Average Elo: 2349.33
Result: 1½/3 = 50%

D36 Queen's Gambit Declined, Exchange, Positional line, 6.Qc2 (1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.cxd5 exd5 5.Bg5 c6 6.Qc2)
Average Elo: 2185
Result: 1/2 = 50%

A08 King's Indian Attack (1.Nf3 d5 2.g3 c5 3.Bg2)
Average Elo: 2315
Result: ½/2 = 25%

A03 Bird's Opening (1.f4 d5)
Average Elo: 2161.5
Result: 2/2 = 100%

A45 Queen's Pawn Game (1.d4 Nf6)
Average Elo: 2326.5
Result: 1½/2 = 75%

E34 Nimzo-Indian, Classical, Noa Variation (1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5)
Average Elo: 2322
Result: ½/2 = 25%

B95 Sicilian, Najdorf, 6...e6 (1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6)
Average Elo: 2229
Result: 2/2 = 100%

A14 English (1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.O-O)
Average Elo: 2267
Result: ½/2 = 25%

A07 King's Indian Attack (1.Nf3 d5 2.g3)
Average Elo: 2360
Result: 2/2 = 100%

B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack (1.e4 c5 2.Nf3 d6 3.Bb5+)
Average Elo: 2220
Result: 1½/2 = 75%

Uncommon Opening (1.g4, a3, h3, etc.)
Average Elo: 2291.5
Result: 2/2 = 100%

A24 English, Bremen System with ...g6 (1.c4 e5 2.Nc3 Nf6 3.g3 g6)
Average Elo: 2210
Result: 2/2 = 100%

B18 Caro-Kann, Classical (1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Bf5)
Average Elo: 2426
Result: 1/2 = 50%

D59 Queen's Gambit Declined, Tartakower (1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bh4 b6 8.cxd5 Nxd5)
Average Elo: 2398.5
Result: 1/2 = 50%

D55 Queen's Gambit Declined (1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3)
Average Elo: 2383.5
Result: ½/2 = 25%

D13 Queen's Gambit Declined Slav, Exchange Variation (1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.cxd5 cxd5)
Average Elo: 0
Result: 0/1 = 0%

D52 Queen's Gambit Declined (1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 c6 6.Nf3)
Average Elo: 2110
Result: 0/1 = 0%

B59 Sicilian, Boleslavsky Variation, 7.Nb3 (1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Be2 e5 7.Nb3)
Average Elo: 2251
Result: 0/1 = 0%

D35 Queen's Gambit Declined (1.d4 d5 2.c4 e6 3.Nc3 Nf6)
Average Elo: 2319
Result: 0/1 = 0%

B70 Sicilian, Dragon Variation (1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6)
Average Elo: 2227
Result: ½/1 = 50%

D46 Queen's Gambit Declined Semi-Slav (1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3)
Average Elo: 2105
Result: 1/1 = 100%

E17 Queen's Indian (1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7)
Average Elo: 2444
Result: ½/1 = 50%

E04 Catalan, Open, 5.Nf3 (1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Nf3)
Average Elo: 2310
Result: ½/1 = 50%

B92 Sicilian, Najdorf, Opocensky Variation (1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2)
Average Elo: 2132
Result: 1/1 = 100%

B15 Caro-Kann (1.e4 c6 2.d4 d5 3.Nc3)
Average Elo: 2209
Result: ½/1 = 50%

D40 Queen's Gambit Declined, Semi-Tarrasch (1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5)
Average Elo: 2163
Result: 1/1 = 100%

E14 Queen's Indian (1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.e3)
Average Elo: 2301
Result: ½/1 = 50%

D78 Neo-Grunfeld, 6.O-O c6 (1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.O-O c6)
Average Elo: 2372
Result: ½/1 = 50%

B86 Sicilian, Fischer-Sozin Attack (1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Bc4)
Average Elo: 1599
Result: 1/1 = 100%

B50 Sicilian (1.e4 c5 2.Nf3 d6)
Average Elo: 2193
Result: 1/1 = 100%

B24 Sicilian, Closed (1.e4 c5 2.Nc3 Nc6 3.g3)
Average Elo: 2203
Result: 1/1 = 100%

A05 Reti Opening (1.Nf3 Nf6)
Average Elo: 2271
Result: 0/1 = 0%

B22 Sicilian, Alapin (1.e4 c5 2.c3)
Average Elo: 2247
Result: 1/1 = 100%

D19 Queen's Gambit Declined Slav, Dutch (1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.e3 e6 7.Bxc4 Bb4 8.O-O O-O 9.Qe2)
Average Elo: 2335
Result: 1/1 = 100%

D17 Queen's Gambit Declined Slav (1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5)
Average Elo: 2351
Result: 0/1 = 0%

E07 Catalan, Closed (1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 Be7 5.Nf3 O-O 6.O-O Nbd7)
Average Elo: 2171
Result: ½/1 = 50%

D58 Queen's Gambit Declined, Tartakower (Makagonov-Bondarevsky) System (1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bh4 b6)
Average Elo: 2290
Result: 0/1 = 0%

B11 Caro-Kann, Two Knights, 3...Bg4 (1.e4 c6 2.Nc3 d5 3.Nf3 Bg4)
Average Elo: 2250
Result: 0/1 = 0%

D37 Queen's Gambit Declined (1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3)
Average Elo: 2493
Result: 0/1 = 0%

E94 King's Indian, Orthodox (1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O)
Average Elo: 1985
Result: 1/1 = 100%

C10 French (1.e4 e6 2.d4 d5 3.Nc3)
Average Elo: 1637
Result: 1/1 = 100%

C00 French Defense (1.e4 e6)
Average Elo: 2150
Result: ½/1 = 50%

E92 King's Indian (1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5)
Average Elo: 1610
Result: 0/1 = 0%

E62 King's Indian, Fianchetto (1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3)
Average Elo: 1993
Result: ½/1 = 50%