CCRL 40/40

Opening statistics

This page shows how many games in our database were played from various openings classified by the Encyclopedia of Chess Openings. The table also shows average draw percentage and white score we observed in our games.

ECO		Number of games	Draws	White score	Commented PGN
A00	Irregular Openings	402	38.1%	49.6%	0.28 MB
A01	Nimzovich-Larsen attack	195	28.2%	52.1%	0.14 MB
A02	Bird's Opening	6	33.3%	66.7%	0.01 MB
A03	Bird's Opening	4	25.0%	37.5%	0.00 MB
A04	Reti Opening	1147	36.4%	54.2%	0.77 MB
A05	Reti Opening, 2..Nf6	726	38.8%	55.0%	0.49 MB
A06	Reti Opening, 2..d5	435	35.2%	49.1%	0.30 MB
A07	Reti Opening, King's Indian attack (Barcza system)	996	40.0%	51.9%	0.69 MB
A08	Reti Opening, King's Indian attack	74	32.4%	52.7%	0.06 MB
A09	Reti Opening, 2..d5 3.c4	137	43.8%	51.1%	0.11 MB
A10	English Opening	384	42.4%	54.0%	0.25 MB
A11	English, Caro-Kann defensive system	68	44.1%	54.4%	0.05 MB
A12	English, Caro-Kann defensive system	57	45.6%	49.1%	0.05 MB
A13	English Opening	563	38.4%	52.8%	0.41 MB
A14	English, Neo-Catalan declined	136	51.5%	55.1%	0.10 MB
A15	English, 1...Nf6 (Anglo-Indian defense)	884	37.1%	53.7%	0.59 MB
A16	English Opening	148	31.1%	52.7%	0.10 MB
A17	English Opening	120	35.8%	57.1%	0.08 MB
A18	English, Mikenas-Carls variation	6	16.7%	75.0%	0.01 MB
A19	English, Mikenas-Carls, Sicilian variation	19	36.8%	44.7%	0.02 MB
A20	English Opening	903	39.6%	54.8%	0.58 MB
A21	English Opening	316	30.1%	56.8%	0.21 MB
A22	English Opening	467	34.7%	51.2%	0.30 MB
A23	English Opening, Bremen system, Keres variation	29	20.7%	62.1%	0.02 MB
A24	English Opening, Bremen system with 3...g6	8	50.0%	62.5%	0.01 MB
A25	English Opening, Sicilian Reversed	303	36.3%	53.8%	0.21 MB
A26	English Opening, Closed system	66	25.8%	46.2%	0.04 MB
A27	English Opening, Three knights system	37	27.0%	51.4%	0.03 MB
A28	English Opening, Four knights system	527	40.4%	52.8%	0.36 MB
A29	English Opening, Four knights, kingside Fianchetto	1250	37.5%	51.8%	0.76 MB
A30	English Opening, Symmetrical variation	1242	37.3%	56.0%	0.79 MB
A31	English Opening, Symmetrical, Benoni formation	120	44.2%	58.8%	0.10 MB
A32	English Opening, Symmetrical	20	35.0%	62.5%	0.02 MB
A33	English Opening, Symmetrical	266	38.7%	55.8%	0.18 MB
A34	English Opening, Symmetrical	319	36.7%	56.9%	0.23 MB
A35	English Opening, Symmetrical	309	39.2%	52.3%	0.22 MB
A36	English Opening, Symmetrical	113	23.9%	50.9%	0.08 MB
A37	English Opening, Symmetrical	101	25.7%	54.5%	0.07 MB
A38	English Opening, Symmetrical	81	42.0%	44.4%	0.06 MB
A39	English Opening, Symmetrical, Main line with d4	84	44.0%	58.9%	0.06 MB
A40	Queen's pawn	944	37.2%	57.4%	0.63 MB
A41	Queen's pawn	155	33.5%	56.8%	0.11 MB
A42	Modern defense, Averbakh system	33	45.5%	65.2%	0.03 MB
A43	Old Benoni defense	87	27.6%	57.5%	0.06 MB
A44	Old Benoni defence	6	83.3%	58.3%	0.00 MB
A45	Queen's pawn game	644	36.2%	52.4%	0.43 MB
A46	Queen's pawn game	462	34.0%	56.2%	0.31 MB
A47	Queen's Indian defense	111	35.1%	59.0%	0.08 MB
A48	King's Indian, East Indian defense	361	36.0%	52.1%	0.25 MB
A49	King's Indian, Fianchetto without c4	146	35.6%	58.9%	0.10 MB
A50	Queen's pawn game	166	33.1%	56.3%	0.11 MB
A51	Budapest defense declined	7	0.0%	57.1%	0.01 MB
A52	Budapest defense	18	44.4%	44.4%	0.01 MB
A53	Old Indian defense	149	31.5%	60.1%	0.11 MB
A54	Old Indian, Ukrainian variation	21	52.4%	64.3%	0.02 MB
A55	Old Indian, Main line	64	46.9%	60.9%	0.05 MB
A56	Benoni defense	110	28.2%	62.3%	0.08 MB
A57	Benko gambit	139	26.6%	50.0%	0.10 MB
A58	Benko gambit accepted	86	43.0%	52.9%	0.06 MB
A59	Benko gambit, 7.e4	16	31.3%	59.4%	0.01 MB
A60	Benoni defense	13	30.8%	69.2%	0.01 MB
A61	Benoni defense	126	22.2%	66.7%	0.08 MB
A62	Benoni, Fianchetto variation	53	30.2%	62.3%	0.04 MB
A63	Benoni, Fianchetto variation, 9...Nbd7	5	20.0%	70.0%	0.01 MB
A64	Benoni, Fianchetto variation, 11...Re8	16	18.8%	34.4%	0.01 MB
A65	Benoni, 6.e4	2	0.0%	0.0%	0.00 MB
A67	Benoni, Taimanov variation	4	0.0%	100.0%	0.00 MB
A69	Benoni, Four pawns attack, Main line	9	55.6%	50.0%	0.01 MB
A70	Benoni, Classical with e4 and Nf3	85	27.1%	54.7%	0.06 MB
A71	Benoni, Classical, 8.Bg5	15	13.3%	46.7%	0.01 MB
A72	Benoni, Classical without 9.O-O	8	12.5%	81.3%	0.01 MB
A73	Benoni, Classical, 9.O-O	7	0.0%	71.4%	0.01 MB
A74	Benoni, Classical, 9...a6, 10.a4	1	0.0%	100.0%	0.00 MB
A75	Benoni, Classical with ...a6 and 10...Bg4	9	22.2%	55.6%	0.01 MB
A76	Benoni, Classical, 9...Re8	10	20.0%	30.0%	0.01 MB
A77	Benoni, Classical, 9...Re8, 10.Nd2	19	21.1%	68.4%	0.01 MB
A78	Benoni, Classical with ...Re8 and ...Na6	9	44.4%	55.6%	0.01 MB
A79	Benoni, Classical, 11.f3	12	41.7%	54.2%	0.01 MB
A80	Dutch	69	31.9%	62.3%	0.05 MB
A81	Dutch defense	129	34.1%	55.8%	0.10 MB
A82	Dutch, Staunton gambit	2	50.0%	75.0%	0.00 MB
A83	Dutch, Staunton gambit, Staunton's line	1	100.0%	50.0%	0.00 MB
A84	Dutch defense	89	39.3%	53.4%	0.07 MB
A85	Dutch with 2.c4 & 3.Nc3	10	20.0%	60.0%	0.01 MB
A86	Dutch with 2.c4 & 3.g3	10	50.0%	45.0%	0.01 MB
A87	Dutch, Leningrad, Main variation	16	62.5%	62.5%	0.02 MB
A88	Dutch, Leningrad, Main variation with 7...c6	34	26.5%	72.1%	0.03 MB
A89	Dutch, Leningrad, Main variation with Nc6	24	33.3%	66.7%	0.02 MB
A90	Dutch defense	51	27.5%	56.9%	0.04 MB
A91	Dutch defense	3	33.3%	83.3%	0.00 MB
A92	Dutch defense	5	40.0%	60.0%	0.01 MB
A93	Dutch, Stonewall, Botwinnik variation	8	25.0%	50.0%	0.01 MB
A94	Dutch, Stonewall with Ba3	3	100.0%	50.0%	0.00 MB
A95	Dutch, Stonewall with Nc3	8	12.5%	43.8%	0.01 MB
A96	Dutch, Classical variation	10	30.0%	65.0%	0.01 MB
A97	Dutch, Ilyin-Genevsky variation	8	50.0%	62.5%	0.01 MB
A98	Dutch, Ilyin-Genevsky variation with Qc2	1	100.0%	50.0%	0.00 MB
A99	Dutch, Ilyin-Genevsky variation with b3	5	60.0%	70.0%	0.01 MB
B00	King's pawn Opening	179	29.6%	60.6%	0.13 MB
B01	Scandinavian (centercounter) center defense	270	40.7%	59.3%	0.18 MB
B02	Alekhine's defense	51	27.5%	47.1%	0.04 MB
B03	Alekhine's defense	83	34.9%	60.8%	0.06 MB
B04	Alekhine's defense, Modern variation	82	41.5%	63.4%	0.06 MB
B05	Alekhine's defense, Modern variation, 4...Bg4	62	30.6%	68.5%	0.05 MB
B06	Robatsch (Modern) defense	298	29.5%	58.4%	0.21 MB
B07	Pirc defense	267	36.3%	55.6%	0.19 MB
B08	Pirc, Classical (Two knights) system	219	35.6%	55.3%	0.16 MB
B09	Pirc, Austrian attack	102	41.2%	53.9%	0.07 MB
B10	Caro-Kann defense	666	35.4%	55.9%	0.43 MB
B11	Caro-Kann, Two knights, 3...Bg4	40	30.0%	57.5%	0.03 MB
B12	Caro-Kann defense	956	34.4%	56.1%	0.59 MB
B13	Caro-Kann, Exchange variation	190	44.7%	48.7%	0.13 MB
B14	Caro-Kann, Panov-Botvinnik attack, 5...e6	382	42.9%	55.5%	0.25 MB
B15	Caro-Kann defense	171	34.5%	52.9%	0.12 MB
B16	Caro-Kann, Bronstein-Larsen variation	22	22.7%	65.9%	0.02 MB
B17	Caro-Kann, Steinitz variation	431	35.7%	54.3%	0.28 MB
B18	Caro-Kann, Classical variation	141	39.7%	52.5%	0.10 MB
B19	Caro-Kann, Classical, 7...Nd7	673	39.8%	53.3%	0.41 MB
B20	Sicilian defense	483	37.7%	49.5%	0.31 MB
B21	Sicilian, Grand Prix attack	191	37.7%	52.4%	0.13 MB
B22	Sicilian, Alapin's variation (2.c3)	717	38.5%	53.7%	0.48 MB
B23	Sicilian, Closed	635	34.0%	53.2%	0.41 MB
B24	Sicilian, Closed	40	37.5%	48.8%	0.03 MB
B25	Sicilian, Closed	67	34.3%	56.0%	0.05 MB
B26	Sicilian, Closed, 6.Be3	49	32.7%	42.9%	0.03 MB
B27	Sicilian defense	168	35.1%	57.4%	0.12 MB
B28	Sicilian, O'Kelly variation	11	54.5%	63.6%	0.01 MB
B29	Sicilian, Nimzovich-Rubinstein variation	24	25.0%	54.2%	0.02 MB
B30	Sicilian defense	682	36.7%	52.1%	0.48 MB
B31	Sicilian, Nimzovich-Rossolimo attack (with ...g6, without ...d6)	316	36.4%	55.9%	0.22 MB
B32	Sicilian defense	207	31.9%	59.4%	0.16 MB
B33	Sicilian defense	1096	31.8%	56.9%	0.64 MB
B34	Sicilian, Accelerated Fianchetto, Exchange variation	39	38.5%	50.0%	0.03 MB
B35	Sicilian, Accelerated Fianchetto, Modern variation with Bc4	114	42.1%	50.9%	0.08 MB
B36	Sicilian, Accelerated Fianchetto, Maroczy bind	109	40.4%	58.7%	0.07 MB
B37	Sicilian, Accelerated Fianchetto, Maroczy bind, 5...Bg7	10	60.0%	50.0%	0.01 MB
B38	Sicilian, Accelerated Fianchetto, Maroczy bind, 6.Be3	88	35.2%	59.7%	0.06 MB
B39	Sicilian, Accelerated Fianchetto, Breyer variation	26	46.2%	50.0%	0.02 MB
B40	Sicilian defense	839	33.6%	55.2%	0.56 MB
B41	Sicilian, Kan variation	61	29.5%	52.5%	0.05 MB
B42	Sicilian, Kan, 5.Bd3	521	35.3%	57.6%	0.35 MB
B43	Sicilian, Kan, 5.Nc3	294	37.8%	56.6%	0.20 MB
B44	Sicilian defense	275	38.5%	52.0%	0.18 MB
B45	Sicilian, Taimanov variation	507	35.3%	57.1%	0.31 MB
B46	Sicilian, Taimanov variation	768	37.1%	55.3%	0.47 MB
B47	Sicilian, Taimanov (Bastrikov) variation	1113	36.8%	54.8%	0.70 MB
B48	Sicilian, Taimanov variation	637	36.3%	52.0%	0.40 MB
B49	Sicilian, Taimanov variation	159	37.1%	56.9%	0.11 MB
B50	Sicilian	350	33.1%	54.6%	0.25 MB
B51	Sicilian, Canal-Sokolsky (Nimzovich-Rossolimo, Moscow) attack	153	42.5%	54.6%	0.11 MB
B52	Sicilian, Canal-Sokolsky attack, 3...Bd7	183	47.5%	56.6%	0.13 MB
B53	Sicilian, Chekhover variation	81	33.3%	52.5%	0.06 MB
B54	Sicilian	260	35.0%	55.6%	0.19 MB
B55	Sicilian, Prins variation, Venice attack	5	60.0%	70.0%	0.01 MB
B56	Sicilian	310	34.2%	53.5%	0.20 MB
B57	Sicilian, Sozin (not Scheveningen)	281	42.3%	51.1%	0.20 MB
B58	Sicilian, Classical	100	47.0%	46.5%	0.07 MB
B59	Sicilian, Boleslavsky variation, 7.Nb3	11	18.2%	54.5%	0.01 MB
B60	Sicilian, Richter-Rauzer	69	30.4%	64.5%	0.04 MB
B61	Sicilian, Richter-Rauzer, Larsen variation, 7.Qd2	43	34.9%	54.7%	0.03 MB
B62	Sicilian, Richter-Rauzer, 6...e6	55	30.9%	48.2%	0.04 MB
B63	Sicilian, Richter-Rauzer, Rauzer attack	244	32.4%	55.9%	0.15 MB
B64	Sicilian, Richter-Rauzer, Rauzer attack, 7...Be7 defense, 9.f4	93	41.9%	48.9%	0.06 MB
B65	Sicilian, Richter-Rauzer, Rauzer attack, 7...Be7 defense, 9...Nxd4	159	38.4%	56.9%	0.10 MB
B66	Sicilian, Richter-Rauzer, Rauzer attack, 7...a6	2735	31.6%	51.1%	1.52 MB
B67	Sicilian, Richter-Rauzer, Rauzer attack, 7...a6 defense, 8...Bd7	778	29.7%	54.0%	0.46 MB
B68	Sicilian, Richter-Rauzer, Rauzer attack, 7...a6 defense, 9...Be7	27	29.6%	66.7%	0.02 MB
B69	Sicilian, Richter-Rauzer, Rauzer attack, 7...a6 defense, 11.Bxf6	48	29.2%	64.6%	0.03 MB
B70	Sicilian, Dragon variation	74	33.8%	52.0%	0.06 MB
B71	Sicilian, Dragon, Levenfish variation	6	16.7%	58.3%	0.00 MB
B72	Sicilian, Dragon, 6.Be3	21	57.1%	47.6%	0.02 MB
B73	Sicilian, Dragon, Classical, 8.O-O	44	34.1%	55.7%	0.04 MB
B74	Sicilian, Dragon, Classical, 9.Nb3	27	29.6%	51.9%	0.02 MB
B75	Sicilian, Dragon, Yugoslav attack	27	33.3%	61.1%	0.02 MB
B76	Sicilian, Dragon, Yugoslav attack, 7...O-O	157	25.5%	62.4%	0.10 MB
B77	Sicilian, Dragon, Yugoslav attack, 9.Bc4	34	44.1%	48.5%	0.02 MB
B78	Sicilian, Dragon, Yugoslav attack, 10.O-O-O	48	20.8%	47.9%	0.03 MB
B79	Sicilian, Dragon, Yugoslav attack, 12.h4	6	16.7%	58.3%	0.01 MB
B80	Sicilian, Scheveningen variation	400	29.3%	53.4%	0.24 MB
B81	Sicilian, Scheveningen, Keres attack	444	32.0%	61.5%	0.26 MB
B82	Sicilian, Scheveningen, 6.f4	82	32.9%	57.9%	0.06 MB
B83	Sicilian, Scheveningen, 6.Be2	367	37.1%	51.0%	0.25 MB
B84	Sicilian, Scheveningen (Paulsen), Classical variation	1203	36.1%	49.8%	0.74 MB
B85	Sicilian, Scheveningen, Classical variation with ...Qc7 and ...Nc6	162	43.2%	55.6%	0.11 MB
B86	Sicilian, Sozin attack	11	45.5%	40.9%	0.01 MB
B87	Sozin with ...a6 and ...b5	152	37.5%	54.3%	0.10 MB
B88	Sicilian, Sozin, Leonhardt variation	58	27.6%	56.9%	0.04 MB
B89	Sicilian, Sozin, 7.Be3	396	29.8%	49.5%	0.24 MB
B90	Sicilian, Najdorf	4712	30.1%	53.0%	2.57 MB
B91	Sicilian, Najdorf, Zagreb (Fianchetto) variation	49	32.7%	53.1%	0.04 MB
B92	Sicilian, Najdorf, Zagreb (Fianchetto) variation	740	37.2%	49.3%	0.48 MB
B93	Sicilian, Najdorf, 6.f4	237	42.6%	51.3%	0.16 MB
B94	Sicilian, Najdorf, 6.Bg5	28	21.4%	57.1%	0.02 MB
B95	Sicilian, Najdorf, 6...e6	53	26.4%	32.1%	0.04 MB
B96	Sicilian, Najdorf, 7.f4	82	34.1%	47.6%	0.06 MB
B97	Sicilian, Najdorf, 7...Qb6	604	35.9%	47.6%	0.32 MB
B98	Sicilian, Najdorf, 7...Be7	74	29.7%	62.2%	0.05 MB
B99	Sicilian, Najdorf, 7...Be7 Main line	143	18.2%	52.4%	0.08 MB
C00	French defense	784	38.0%	50.3%	0.51 MB
C01	French, Exchange variation	238	39.5%	53.8%	0.18 MB
C02	French, Advance variation	551	30.3%	53.8%	0.36 MB
C03	French, Tarrasch	218	39.4%	59.2%	0.16 MB
C04	French, Tarrasch, Guimard Main line	23	26.1%	52.2%	0.02 MB
C05	French, Tarrasch, Closed variation	125	34.4%	57.2%	0.08 MB
C06	French, Tarrasch, Closed variation, Main line	314	38.2%	61.5%	0.20 MB
C07	French, Tarrasch, Open variation	473	46.7%	51.9%	0.32 MB
C08	French, Tarrasch, Open, 4.exd5 exd5	207	50.2%	54.6%	0.14 MB
C09	French, Tarrasch, Open variation, Main line	229	52.0%	57.9%	0.16 MB
C10	French, Paulsen variation	393	36.9%	56.1%	0.26 MB
C11	French defense	1269	35.4%	55.8%	0.76 MB
C12	French, MacCutcheon variation	204	30.4%	51.5%	0.13 MB
C13	French, Classical	30	20.0%	60.0%	0.02 MB
C14	French, Classical variation	76	30.3%	57.2%	0.05 MB
C15	French, Winawer (Nimzovich) variation	90	43.3%	53.9%	0.07 MB
C16	French, Winawer, Advance variation	127	29.9%	65.4%	0.08 MB
C17	French, Winawer, Advance variation	196	28.6%	57.7%	0.12 MB
C18	French, Winawer, Advance variation	68	25.0%	56.6%	0.05 MB
C19	French, Winawer, Advance, 6...Ne7	1112	29.5%	58.6%	0.69 MB
C20	King's pawn game	9	22.2%	55.6%	0.01 MB
C21	center game	47	46.8%	70.2%	0.04 MB
C22	center game	62	22.6%	67.7%	0.04 MB
C23	Bishop's Opening	122	41.8%	57.8%	0.08 MB
C24	Bishop's Opening, Berlin defense	89	37.1%	54.5%	0.07 MB
C25	Vienna game	79	36.7%	53.8%	0.06 MB
C26	Vienna, Falkbeer variation	74	39.2%	52.0%	0.05 MB
C27	Vienna game	11	45.5%	40.9%	0.01 MB
C28	Vienna game	30	33.3%	50.0%	0.02 MB
C29	Vienna gambit, Kaufmann variation	20	40.0%	65.0%	0.01 MB
C30	King's gambit	20	40.0%	65.0%	0.02 MB
C31	KGD, Falkbeer counter-gambit	2	100.0%	50.0%	0.00 MB
C33	King's gambit accepted	13	23.1%	34.6%	0.01 MB
C34	King's knight's gambit	13	23.1%	65.4%	0.01 MB
C35	KGA, Cunningham defense	5	0.0%	40.0%	0.00 MB
C36	KGA, Abbazia defense (Classical defense, Modern defense)	6	50.0%	41.7%	0.01 MB
C37	KGA, Quaade gambit	2	50.0%	25.0%	0.00 MB
C38	King's knight's gambit	4	0.0%	0.0%	0.00 MB
C39	King's knight's gambit	13	30.8%	46.2%	0.01 MB
C40	King's knight Opening	31	35.5%	69.4%	0.02 MB
C41	Philidor's defense	158	34.8%	56.0%	0.11 MB
C42	Petrov's defense	1075	36.3%	57.2%	0.67 MB
C43	Petrov, Modern (Steinitz) attack	258	37.6%	51.7%	0.16 MB
C44	King's pawn game	128	39.1%	53.1%	0.09 MB
C45	Scotch game	853	40.4%	53.0%	0.51 MB
C46	Three knights game	137	40.9%	51.1%	0.10 MB
C47	Four knights, Scotch variation	60	46.7%	51.7%	0.05 MB
C48	Four knights, Spanish variation	191	42.4%	55.8%	0.13 MB
C49	Four knights, double Ruy Lopez	145	37.2%	55.2%	0.10 MB
C50	King's pawn game	389	38.3%	51.3%	0.25 MB
C51	Evans gambit declined	30	26.7%	46.7%	0.02 MB
C52	Evans gambit	28	35.7%	46.4%	0.02 MB
C53	Giuoco piano	422	35.5%	54.7%	0.29 MB
C54	Guioco piano	36	44.4%	44.4%	0.02 MB
C55	Two knights defense	133	39.1%	55.6%	0.10 MB
C56	Two knights defense	8	62.5%	56.3%	0.01 MB
C57	Two knights defense	8	37.5%	68.8%	0.01 MB
C58	Two knights defense	11	36.4%	63.6%	0.01 MB
C59	Two knights defense	306	32.0%	52.3%	0.18 MB
C60	Ruy Lopez	28	28.6%	67.9%	0.02 MB
C61	Ruy Lopez, Bird's defense	6	0.0%	66.7%	0.00 MB
C62	Ruy Lopez, Old Steinitz defence	97	34.0%	57.2%	0.08 MB
C63	Ruy Lopez, Schilemann defense	23	26.1%	60.9%	0.02 MB
C64	Ruy Lopez, Classical (Cordel) defence	178	34.3%	57.0%	0.13 MB
C65	Ruy Lopez, Berlin defense	149	31.5%	55.4%	0.12 MB
C66	Ruy Lopez, Berlin defence, 4.O-O, d6	147	50.3%	57.8%	0.10 MB
C67	Ruy Lopez, Berlin defence, Open variation	471	41.6%	55.2%	0.30 MB
C68	Ruy Lopez, Exchange variation	29	48.3%	48.3%	0.02 MB
C69	Ruy Lopez, Exchange variation, 5.O-O	145	29.0%	55.2%	0.10 MB
C70	Ruy Lopez,	162	37.0%	62.3%	0.12 MB
C71	Ruy Lopez, Modern Steinitz defense	46	30.4%	56.5%	0.04 MB
C72	Ruy Lopez, Modern Steinitz defense 5.0-0	43	34.9%	59.3%	0.03 MB
C73	Ruy Lopez, Modern Steinitz defense, Richter variation	28	35.7%	57.1%	0.02 MB
C74	Ruy Lopez, Modern Steinitz defense	21	28.6%	66.7%	0.02 MB
C75	Ruy Lopez, Modern Steinitz defense	22	27.3%	59.1%	0.02 MB
C76	Ruy Lopez, Modern Steinitz defense, Fianchetto (Bronstein) variation	52	34.6%	51.9%	0.04 MB
C77	Ruy Lopez, Morphy defence	195	33.8%	57.9%	0.15 MB
C78	Ruy Lopez, 5.O-O	346	36.7%	55.6%	0.23 MB
C79	Ruy Lopez, Steinitz defense deferred (Russian defence)	80	32.5%	56.3%	0.06 MB
C80	Ruy Lopez, Open (Tarrasch) defence	185	36.8%	56.2%	0.12 MB
C81	Ruy Lopez, Open, Howell attack	3	33.3%	83.3%	0.00 MB
C82	Ruy Lopez, Open, 9.c3	20	25.0%	52.5%	0.01 MB
C83	Ruy Lopez, Open, Classical defence	33	48.5%	54.5%	0.02 MB
C84	Ruy Lopez, Closed defense	396	37.6%	54.7%	0.25 MB
C85	Ruy Lopez, Exchange variation doubly deferred (DERLD)	325	36.6%	49.4%	0.22 MB
C86	Worrall attack	45	48.9%	51.1%	0.04 MB
C87	Ruy Lopez, Closed, Averbach variation	57	36.8%	58.8%	0.04 MB
C88	Ruy Lopez, Closed	780	35.4%	54.1%	0.48 MB
C89	Ruy Lopez, Marshall counter-attack	113	30.1%	54.0%	0.08 MB
C90	Ruy Lopez, closed (with ...d6)	526	33.3%	47.1%	0.35 MB
C91	Ruy Lopez, closed, 9.d4	1226	35.8%	54.3%	0.80 MB
C92	Ruy Lopez, closed, 9.d4	963	37.9%	55.4%	0.61 MB
C93	Ruy Lopez, closed, Smyslov defense	17	29.4%	50.0%	0.02 MB
C94	Ruy Lopez, Closed, Breyer defense	2	50.0%	25.0%	0.00 MB
C95	Ruy Lopez, closed, Breyer, 10.d4	326	35.3%	56.3%	0.23 MB
C96	Ruy Lopez, closed, 8...Na5	227	35.2%	57.7%	0.16 MB
C97	Ruy Lopez, Closed, Chigorin defense	276	29.0%	63.8%	0.18 MB
C98	Ruy Lopez, Closed, Chigorin, 12...Nc6	71	32.4%	58.5%	0.06 MB
C99	Ruy Lopez, Closed, Chigorin, 12...c5d4	484	43.4%	62.4%	0.31 MB
D00	Queen's pawn game	428	39.5%	50.4%	0.29 MB
D01	Richter-Veresov attack	53	24.5%	40.6%	0.04 MB
D02	Queen's pawn game, 2. Nf3	1447	35.1%	52.2%	0.94 MB
D03	Torre attack, Tartakower variation	67	37.3%	47.0%	0.05 MB
D04	Queen's pawn game	106	35.8%	49.1%	0.08 MB
D05	Queen's pawn game, Zukertort variation	111	39.6%	54.1%	0.08 MB
D06	Queen's Gambit	50	44.0%	60.0%	0.04 MB
D07	QGD; Chigorin defense	307	35.2%	59.9%	0.19 MB
D08	QGD; Albin counter-gambit	3	33.3%	50.0%	0.00 MB
D09	QGD; Albin counter-gambit, 5.g3	4	25.0%	37.5%	0.01 MB
D10	QGD; Slav defense	586	36.0%	54.7%	0.40 MB
D11	QGD; Slav defense, 3.Nf3	333	36.0%	53.8%	0.24 MB
D12	QGD; Slav defense, 4.e3 Bf5	351	38.5%	54.6%	0.23 MB
D13	QGD; Slav defense, Exchange variation	74	35.1%	59.5%	0.05 MB
D14	QGD; Slav defense, Exchange variation	51	43.1%	51.0%	0.03 MB
D15	QGD; Slav accepted, Exchange variation, 6.Bf4 Bf5	272	34.6%	52.9%	0.19 MB
D16	QGD; Slav accepted, Alapin variation	39	23.1%	73.1%	0.03 MB
D17	QGD; Slav defense, Czech defence	201	31.8%	56.7%	0.12 MB
D18	QGD; Dutch variation	16	12.5%	56.3%	0.01 MB
D19	QGD; Dutch variation	309	33.7%	58.9%	0.20 MB
D20	Queen's Gambit accepted	360	36.1%	58.1%	0.23 MB
D21	QGA, 3.Nf3	49	32.7%	55.1%	0.04 MB
D22	QGA; Alekhine defense	17	58.8%	52.9%	0.01 MB
D23	Queen's gambit accepted	11	45.5%	50.0%	0.01 MB
D24	QGA, 4.Nc3	20	45.0%	57.5%	0.02 MB
D25	QGA, 4.e3	65	41.5%	60.8%	0.05 MB
D26	QGA; classical variation	264	50.8%	52.7%	0.18 MB
D27	QGA; classical variation	860	45.5%	56.3%	0.55 MB
D28	QGA; Classical variation 7.Qe2	34	41.2%	61.8%	0.02 MB
D29	QGA; Classical variation 8...Bb7	75	37.3%	42.7%	0.05 MB
D30	QGD	1051	40.2%	54.9%	0.68 MB
D31	QGD, 3.Nc3	222	36.5%	54.7%	0.16 MB
D32	QGD; Tarrasch defense	41	48.8%	58.5%	0.03 MB
D33	QGD; Tarrasch, Schlechter-Rubinstein system	19	42.1%	47.4%	0.02 MB
D34	QGD; Tarrasch, 7...Be7	151	43.7%	55.6%	0.11 MB
D35	QGD; 3...Nf6	169	37.3%	57.1%	0.12 MB
D36	QGD; Exchange, positional line, 6.Qc2	10	40.0%	40.0%	0.01 MB
D37	QGD; 4.Nf3	1027	40.5%	55.7%	0.64 MB
D38	QGD; Ragozin variation	322	39.4%	55.4%	0.22 MB
D39	QGD; Ragozin, Vienna variation	535	47.3%	52.8%	0.30 MB
D40	QGD; Semi-Tarrasch defense	110	41.8%	50.9%	0.08 MB
D41	QGD; Semi-Tarrasch, 5.cd	100	43.0%	55.5%	0.07 MB
D42	QGD; Semi-Tarrasch, 7.Bd3	41	48.8%	58.5%	0.04 MB
D43	QGD; Semi-Slav	986	37.1%	52.8%	0.61 MB
D44	QGD; Semi-Slav 5.Bg5 dc	295	33.2%	53.9%	0.16 MB
D45	QGD; Semi-Slav 5.e3	3620	38.8%	51.9%	2.20 MB
D46	QGD; Semi-Slav 6.Bd3	232	37.9%	58.2%	0.15 MB
D47	QGD; Semi-Slav 7.Bc4	3104	34.9%	55.0%	1.82 MB
D48	QGD; Meran, 8...a6	563	36.2%	52.4%	0.35 MB
D49	QGD; Meran, 11. Nxb5	235	37.9%	47.0%	0.14 MB
D50	QGD; 4.Bg5	17	35.3%	52.9%	0.01 MB
D51	QGD; 4.Bg5 Nbd7	9	44.4%	55.6%	0.01 MB
D52	QGD	140	47.1%	53.6%	0.10 MB
D53	QGD; 4.Bg5 Be7	8	37.5%	43.8%	0.01 MB
D55	QGD; 6.Nf3	146	46.6%	56.8%	0.10 MB
D56	QGD; Lasker defense	44	27.3%	50.0%	0.03 MB
D58	QGD; Tartakower (Makagonov-Bondarevsky) system	2021	44.8%	52.8%	1.31 MB
D59	QGD; Tartakower (Makagonov-Bondarevsky) system, 8.cd Nxd5	51	35.3%	47.1%	0.03 MB
D60	QGD; Orthodox defense	18	38.9%	63.9%	0.02 MB
D61	QGD; Orthodox defense, Rubinstein variation	29	48.3%	51.7%	0.03 MB
D62	QGD; Orthodox defense, 7.Qc2 c5, 8.cd (Rubinstein)	21	52.4%	69.0%	0.02 MB
D63	QGD; Orthodox defense, 7.Rc1	74	37.8%	55.4%	0.05 MB
D64	QGD; Orthodox defense, Rubinstein attack (with Rc1)	30	43.3%	51.7%	0.02 MB
D66	QGD; Orthodox defense, Bd3 line	41	41.5%	62.2%	0.03 MB
D67	QGD; Orthodox defense, Bd3 line, Capablanca freeing manoever	53	41.5%	58.5%	0.04 MB
D68	QGD; Orthodox defense, Classical variation	67	47.8%	56.7%	0.05 MB
D69	QGD; Orthodox defense, Classical, 13.dxe5	15	66.7%	40.0%	0.01 MB
D70	Neo-Gruenfeld defense	26	34.6%	48.1%	0.02 MB
D71	Neo-Gruenfeld, 5.cd	14	57.1%	50.0%	0.01 MB
D72	Neo-Gruenfeld, 5.cd, Main line	13	38.5%	34.6%	0.01 MB
D73	Neo-Gruenfeld, 5.Nf3	70	57.1%	54.3%	0.06 MB
D74	Neo-Gruenfeld, 6.cd Nxd5, 7.O-O	13	46.2%	61.5%	0.01 MB
D75	Neo-Gruenfeld, 6.cd Nxd5, 7.O-O c5, 8.Nc3	12	25.0%	62.5%	0.01 MB
D76	Neo-Gruenfeld, 6.cd Nxd5, 7.O-O Nb6	44	47.7%	55.7%	0.04 MB
D77	Neo-Gruenfeld, 6.O-O	79	41.8%	52.5%	0.06 MB
D78	Neo-Gruenfeld, 6.O-O c6	77	39.0%	53.2%	0.05 MB
D79	Neo-Gruenfeld, 6.O-O, Main line	37	45.9%	50.0%	0.03 MB
D80	Gruenfeld defense	61	34.4%	59.8%	0.05 MB
D81	Gruenfeld; Russian variation	6	66.7%	66.7%	0.01 MB
D82	Gruenfeld 4.Bf4	32	46.9%	51.6%	0.02 MB
D83	Gruenfeld gambit	10	30.0%	65.0%	0.01 MB
D84	Gruenfeld gambit accepted	2	50.0%	25.0%	0.00 MB
D85	Gruenfeld, exchange variation	816	48.2%	54.1%	0.52 MB
D86	Gruenfeld, Exchange, Classical variation	83	42.2%	54.8%	0.06 MB
D87	Gruenfeld, Exchange, Spassky variation	79	39.2%	62.7%	0.05 MB
D88	Gruenfeld, Spassky variation, Main line, 10...cd, 11.cd	16	56.3%	59.4%	0.01 MB
D89	Gruenfeld, Spassky variation, Main line, 13.Bd3	15	60.0%	43.3%	0.02 MB
D90	Gruenfeld, Three knights variation	44	25.0%	51.1%	0.03 MB
D91	Gruenfeld, Three knights variation	192	32.3%	47.9%	0.14 MB
D92	Gruenfeld, 5.Bf4	84	51.2%	56.5%	0.05 MB
D93	Gruenfeld with 5. Bf4 O-O 6. e3	43	48.8%	57.0%	0.03 MB
D94	Gruenfeld, 5.e3	99	50.5%	56.6%	0.07 MB
D95	Gruenfeld with 5. e3 O-O 6. Qb3	7	28.6%	57.1%	0.01 MB
D96	Gruenfeld, Russian variation	15	46.7%	70.0%	0.01 MB
D97	Gruenfeld, Russian variation with 7. e4	477	40.3%	50.7%	0.30 MB
D98	Gruenfeld, Russian, Smyslov variation	40	35.0%	70.0%	0.03 MB
D99	Gruenfeld defense, Smyslov, Main line	36	50.0%	52.8%	0.02 MB
E00	Queen's pawn game	569	38.1%	53.9%	0.41 MB
E01	Catalan, closed	30	33.3%	56.7%	0.02 MB
E02	Catalan, open, 5.Qa4	10	40.0%	70.0%	0.01 MB
E04	Catalan, Open, 5.Nf3	567	39.3%	51.1%	0.35 MB
E05	Catalan, Open, Classical line	21	23.8%	50.0%	0.02 MB
E06	Catalan, Closed, 5.Nf3	377	46.7%	52.0%	0.26 MB
E07	Catalan, Closed, 6...Nbd7	20	25.0%	37.5%	0.02 MB
E08	Catalan, Closed, 7.Qc2	23	34.8%	47.8%	0.02 MB
E09	Catalan, Closed, Main line	23	13.0%	71.7%	0.02 MB
E10	Queen's pawn game 3. Nf3	723	39.7%	58.0%	0.47 MB
E11	Bogo-Indian defense	478	34.1%	54.9%	0.33 MB
E12	Queen's Indian defense	1957	36.0%	52.2%	1.22 MB
E13	Queen's Indian, 4.Nc3, Main line	16	37.5%	62.5%	0.01 MB
E14	Queen's Indian, 4.e3	318	35.5%	55.2%	0.20 MB
E15	Queen's Indian, 4.g3	4726	35.4%	55.9%	2.89 MB
E16	Queen's Indian, Capablanca variation	61	34.4%	53.3%	0.04 MB
E17	Queen's Indian, 5.Bg2 Be7	145	41.4%	55.9%	0.10 MB
E18	Queen's Indian, Old Main line, 7.Nc3	149	43.6%	59.4%	0.10 MB
E19	Queen's Indian, Old Main line, 9.Qxc3	163	36.2%	59.2%	0.12 MB
E20	Nimzo-Indian defense	146	34.2%	54.8%	0.10 MB
E21	Nimzo-Indian, Three knights variation	240	35.8%	50.4%	0.17 MB
E22	Nimzo-Indian, Spielmann variation	12	41.7%	54.2%	0.01 MB
E23	Nimzo-Indian, Spielmann, 4...c5, 5.dc Nc6	3	33.3%	50.0%	0.00 MB
E24	Nimzo-Indian, Saemisch variation	17	47.1%	29.4%	0.01 MB
E25	Nimzo-Indian, Saemisch variation, Keres variation	47	57.4%	47.9%	0.03 MB
E26	Nimzo-Indian, Saemisch variation, 4. a3 Bxc3+ 5. bxc3 c5 6. e3	5	0.0%	20.0%	0.01 MB
E27	Nimzo-Indian, Saemisch variation, 5...0-0	2	50.0%	25.0%	0.00 MB
E28	Nimzo-Indian, Saemisch variation, 6. e3	3	0.0%	100.0%	0.00 MB
E29	Nimzo-Indian, Saemisch variation, Main line	16	31.3%	40.6%	0.01 MB
E30	Nimzo-Indian, Leningrad variation,	56	32.1%	53.6%	0.04 MB
E31	Nimzo-Indian, Leningrad variation, main line	10	10.0%	45.0%	0.01 MB
E32	Nimzo-Indian, Classical variation	1214	41.2%	54.1%	0.74 MB
E33	Nimzo-Indian, Classical variation, 4...Nc6	57	35.1%	54.4%	0.04 MB
E34	Nimzo-Indian, Classical, Noa variation	117	49.6%	53.0%	0.08 MB
E35	Nimzo-Indian, Classical, Noa variation, 5. cxd5 exd5	62	41.9%	59.7%	0.05 MB
E36	Nimzo-Indian, Classical, Noa variation, 5. a3	19	15.8%	44.7%	0.02 MB
E37	Nimzo-Indian, Classical, Noa variation, Main line, 7.Qc2	15	33.3%	76.7%	0.01 MB
E38	Nimzo-Indian, Classical, 4...c5	52	30.8%	69.2%	0.04 MB
E39	Nimzo-Indian, Classical, Pirc variation	111	37.8%	57.7%	0.08 MB
E40	Nimzo-Indian, 4.e3	44	25.0%	48.9%	0.03 MB
E41	Nimzo-Indian, 4.e3 c5	155	34.2%	48.7%	0.11 MB
E42	Nimzo-Indian, 4.e3 c5, 5.Ne2 (Rubinstein)	164	42.7%	53.0%	0.11 MB
E43	Nimzo-Indian, Fischer variation	70	37.1%	58.6%	0.05 MB
E44	Nimzo-Indian, Fischer variation, 5.Ne2	57	35.1%	57.9%	0.04 MB
E45	Nimzo-Indian, 4.e3, Bronstein (Byrne) variation	30	53.3%	60.0%	0.02 MB
E46	Nimzo-Indian, 4.e3 O-O	85	40.0%	49.4%	0.06 MB
E47	Nimzo-Indian, 4.e3 O-O, 5.Bd3	44	50.0%	54.5%	0.03 MB
E48	Nimzo-Indian, 4.e3 O-O, 5.Bd3 d5	56	37.5%	49.1%	0.04 MB
E49	Nimzo-Indian, 4.e3, Botvinnik system	28	50.0%	67.9%	0.02 MB
E50	Nimzo-Indian, 4.e3 e8g8, 5.Nf3, without ...d5	17	41.2%	44.1%	0.02 MB
E51	Nimzo-Indian, 4.e3 e8g8, 5.Nf3 d7d5	14	71.4%	50.0%	0.01 MB
E52	Nimzo-Indian, 4.e3, Main line with ...b6	47	36.2%	62.8%	0.04 MB
E53	Nimzo-Indian, 4.e3, Main line with ...c5	70	42.9%	64.3%	0.05 MB
E54	Nimzo-Indian, 4.e3, Gligoric system with 7...dc	160	43.1%	55.3%	0.11 MB
E55	Nimzo-Indian, 4.e3, Gligoric system, Bronstein variation	829	46.1%	53.7%	0.54 MB
E56	Nimzo-Indian, 4.e3, Main line with 7...Nc6	16	50.0%	56.3%	0.01 MB
E57	Nimzo-Indian, 4. e3, Main line with 8...dxc4 and 9...Bxc4 cxd4	5	60.0%	30.0%	0.00 MB
E58	Nimzo-Indian, 4.e3, Main line with 8...Bxc3	247	32.4%	53.4%	0.16 MB
E59	Nimzo-Indian, 4.e3, Main line	428	43.0%	51.2%	0.27 MB
E60	King's Indian defense	624	35.7%	57.0%	0.45 MB
E61	King's Indian defense, 3.Nc3	133	28.6%	57.9%	0.10 MB
E62	King's Indian, Fianchetto variation	241	35.7%	58.9%	0.16 MB
E63	King's Indian, Fianchetto, Panno variation	480	35.2%	55.9%	0.32 MB
E64	King's Indian, Fianchetto, Yugoslav system	10	30.0%	75.0%	0.01 MB
E65	King's Indian, Yugoslav, 7.O-O	12	50.0%	50.0%	0.01 MB
E66	King's Indian, Fianchetto, Yugoslav Panno	40	35.0%	55.0%	0.03 MB
E67	King's Indian, Fianchetto with ...Nd7	94	34.0%	57.4%	0.07 MB
E68	King's Indian, Fianchetto, Classical variation, 8.e4	223	34.1%	60.1%	0.15 MB
E69	King's Indian, Fianchetto, Classical Main line	169	34.9%	60.1%	0.11 MB
E70	King's Indian, 4.e4	85	23.5%	74.1%	0.06 MB
E71	King's Indian, Makagonov system (5.h3)	47	25.5%	63.8%	0.04 MB
E72	King's Indian with e4 & g3	8	50.0%	62.5%	0.01 MB
E73	King's Indian, 5.Be2	54	31.5%	56.5%	0.04 MB
E74	King's Indian, Averbakh, 6...c5	8	25.0%	62.5%	0.01 MB
E75	King's Indian, Averbakh, Main line	3	33.3%	83.3%	0.00 MB
E76	King's Indian, Four pawns attack	32	37.5%	59.4%	0.02 MB
E77	King's Indian, Four pawns attack, 6.Be2	30	20.0%	63.3%	0.02 MB
E79	King's Indian, Four pawns attack, Main line	3	33.3%	50.0%	0.00 MB
E80	King's Indian, Saemisch variation	23	30.4%	58.7%	0.02 MB
E81	King's Indian, Saemisch, 5...O-O	186	35.5%	55.9%	0.12 MB
E82	King's Indian, Saemisch, double Fianchetto variation	10	30.0%	55.0%	0.01 MB
E83	King's Indian, Saemisch, 6...Nc6	10	60.0%	60.0%	0.01 MB
E84	King's Indian, Saemisch, Panno Main line	64	35.9%	52.3%	0.05 MB
E86	King's Indian, Saemisch, Orthodox, 7.Nge2 c6	45	31.1%	40.0%	0.03 MB
E87	King's Indian, Saemisch, Orthodox, 7.d5	40	32.5%	61.3%	0.03 MB
E88	King's Indian, Saemisch, Orthodox, 7.d5 c6	61	32.8%	59.0%	0.04 MB
E89	King's Indian, Saemisch, Orthodox Main line	1	0.0%	0.0%	0.00 MB
E90	King's Indian, 5.Nf3	117	30.8%	61.5%	0.09 MB
E91	King's Indian, 6.Be2	120	36.7%	59.2%	0.08 MB
E92	King's Indian, Classical variation	306	30.4%	56.4%	0.21 MB
E93	King's Indian, Petrosian system, Main line	7	28.6%	71.4%	0.01 MB
E94	King's Indian, Orthodox variation	341	34.0%	60.1%	0.23 MB
E95	King's Indian, Orthodox, 7...Nbd7, 8.Re1	46	34.8%	63.0%	0.03 MB
E96	King's Indian, Orthodox, 7...Nbd7, Main line	16	31.3%	40.6%	0.01 MB
E97	King's Indian, Orthodox, Aronin-Taimanov variation (Yugoslav attack / Mar del Plata variation)	1192	32.3%	56.1%	0.75 MB
E98	King's Indian, Orthodox, Aronin-Taimanov, 9.Ne1	380	22.4%	60.7%	0.24 MB
E99	King's Indian, Orthodox, Aronin-Taimanov, Main line	6	16.7%	75.0%	0.00 MB