KCEC
(Kirr's Chess Engine Comparison)
A tournament of original free chess engines
June 16, 2013
Testing summary:
Total: 135,679 games
played by 202 programs
1398 CPU days (X2 4600+)

White wins: 55,227 (40.7%)
Black wins: 47,434 (35.0%)
Draws: 33,018 (24.3%)
White score: 52.9%

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.

ECONumber
of
games
DrawsWhite
score
A00Irregular Openings94121.7%51.1%
A01Nimzovich-Larsen attack52623.4%48.8%
A02Bird's Opening5014.0%51.0%
A03Bird's Opening4214.3%45.2%
A04Reti Opening106819.5%54.9%
A05Reti Opening, 2..Nf669521.7%52.2%
A06Reti Opening, 2..d582422.1%55.7%
A07Reti Opening, King's Indian attack (Barcza system)148523.6%52.2%
A08Reti Opening, King's Indian attack11018.2%46.4%
A09Reti Opening, 2..d5 3.c415420.8%59.1%
A10English Opening51519.2%56.0%
A11English, Caro-Kann defensive system5529.1%54.5%
A12English, Caro-Kann defensive system4015.0%42.5%
A13English Opening55621.4%50.4%
A14English, Neo-Catalan declined20632.0%56.8%
A15English, 1...Nf6 (Anglo-Indian defense)58022.8%54.3%
A16English Opening2433.3%45.8%
A17English Opening3522.9%62.9%
A18English, Mikenas-Carls variation147.1%60.7%
A19English, Mikenas-Carls, Sicilian variation2711.1%42.6%
A20English Opening150624.7%50.4%
A21English Opening31629.4%53.0%
A22English Opening88928.3%47.8%
A23English Opening, Bremen system, Keres variation6726.9%49.3%
A24English Opening, Bremen system with 3...g6616.7%58.3%
A25English Opening, Sicilian Reversed49925.5%52.6%
A26English Opening, Closed system10419.2%46.2%
A27English Opening, Three knights system2835.7%46.4%
A28English Opening, Four knights system58625.4%55.2%
A29English Opening, Four knights, kingside Fianchetto250829.1%49.8%
A30English Opening, Symmetrical variation232926.8%53.9%
A31English Opening, Symmetrical, Benoni formation33920.6%51.9%
A32English Opening, Symmetrical1822.2%50.0%
A33English Opening, Symmetrical54724.7%54.6%
A34English Opening, Symmetrical44822.1%51.2%
A35English Opening, Symmetrical59028.1%53.9%
A36English Opening, Symmetrical10528.6%48.6%
A37English Opening, Symmetrical13220.5%55.7%
A38English Opening, Symmetrical14729.9%51.7%
A39English Opening, Symmetrical, Main line with d47321.9%54.8%
A40Queen's pawn46622.1%54.4%
A41Queen's pawn25016.0%54.0%
A42Modern defense, Averbakh system4522.2%53.3%
A43Old Benoni defense12819.5%55.9%
A44Old Benoni defence911.1%27.8%
A45Queen's pawn game75821.6%51.5%
A46Queen's pawn game52523.2%53.1%
A47Queen's Indian defense4816.7%54.2%
A48King's Indian, East Indian defense39824.4%52.6%
A49King's Indian, Fianchetto without c414226.8%50.0%
A50Queen's pawn game42828.0%51.2%
A51Budapest defense declined2321.7%76.1%
A52Budapest defense7724.7%63.0%
A53Old Indian defense18424.5%49.7%
A54Old Indian, Ukrainian variation3930.8%69.2%
A55Old Indian, Main line4020.0%52.5%
A56Benoni defense41617.8%59.1%
A57Benko gambit8018.8%48.1%
A58Benko gambit accepted3619.4%54.2%
A59Benko gambit, 7.e41100.0%50.0%
A60Benoni defense1910.5%47.4%
A61Benoni defense7316.4%61.6%
A62Benoni, Fianchetto variation547.4%66.7%
A63Benoni, Fianchetto variation, 9...Nbd7333.3%50.0%
A65Benoni, 6.e4540.0%40.0%
A67Benoni, Taimanov variation20.0%50.0%
A68Benoni, Four pawns attack10.0%0.0%
A69Benoni, Four pawns attack, Main line30.0%33.3%
A70Benoni, Classical with e4 and Nf33520.0%58.6%
A71Benoni, Classical, 8.Bg510.0%100.0%
A72Benoni, Classical without 9.O-O40.0%75.0%
A73Benoni, Classical, 9.O-O50.0%40.0%
A76Benoni, Classical, 9...Re8100.0%60.0%
A77Benoni, Classical, 9...Re8, 10.Nd21100.0%50.0%
A80Dutch25724.1%51.0%
A81Dutch defense22524.9%59.6%
A82Dutch, Staunton gambit1631.3%40.6%
A83Dutch, Staunton gambit, Staunton's line2619.2%48.1%
A84Dutch defense19724.4%53.8%
A85Dutch with 2.c4 & 3.Nc32119.0%61.9%
A86Dutch with 2.c4 & 3.g31717.6%73.5%
A87Dutch, Leningrad, Main variation3016.7%41.7%
A88Dutch, Leningrad, Main variation with 7...c64623.9%42.4%
A89Dutch, Leningrad, Main variation with Nc61428.6%42.9%
A90Dutch defense13220.5%58.7%
A91Dutch defense2433.3%58.3%
A92Dutch defense205.0%62.5%
A93Dutch, Stonewall, Botwinnik variation2416.7%70.8%
A94Dutch, Stonewall with Ba3560.0%30.0%
A95Dutch, Stonewall with Nc32100.0%50.0%
A96Dutch, Classical variation2416.7%54.2%
A97Dutch, Ilyin-Genevsky variation1118.2%72.7%
A98Dutch, Ilyin-Genevsky variation with Qc220.0%0.0%
A99Dutch, Ilyin-Genevsky variation with b3100.0%60.0%
B00King's pawn Opening27922.2%53.8%
B01Scandinavian (centercounter) center defense51920.2%54.2%
B02Alekhine's defense7223.6%50.7%
B03Alekhine's defense22418.8%53.1%
B04Alekhine's defense, Modern variation8916.9%54.5%
B05Alekhine's defense, Modern variation, 4...Bg43030.0%58.3%
B06Robatsch (Modern) defense30222.2%56.5%
B07Pirc defense29718.9%58.2%
B08Pirc, Classical (Two knights) system28129.2%57.3%
B09Pirc, Austrian attack10521.0%53.3%
B10Caro-Kann defense104324.4%53.0%
B11Caro-Kann, Two knights, 3...Bg410019.0%49.5%
B12Caro-Kann defense152422.5%53.4%
B13Caro-Kann, Exchange variation37324.7%54.4%
B14Caro-Kann, Panov-Botvinnik attack, 5...e653827.3%52.3%
B15Caro-Kann defense27323.4%52.7%
B16Caro-Kann, Bronstein-Larsen variation2123.8%64.3%
B17Caro-Kann, Steinitz variation134125.0%54.1%
B18Caro-Kann, Classical variation34622.0%56.6%
B19Caro-Kann, Classical, 7...Nd7155724.7%60.2%
B20Sicilian defense27320.5%48.4%
B21Sicilian, Grand Prix attack17520.6%44.6%
B22Sicilian, Alapin's variation (2.c3)88525.8%53.7%
B23Sicilian, Closed45020.2%51.7%
B24Sicilian, Closed6921.7%47.1%
B25Sicilian, Closed8118.5%47.5%
B26Sicilian, Closed, 6.Be33016.7%55.0%
B27Sicilian defense19417.0%55.9%
B28Sicilian, O'Kelly variation7924.1%58.9%
B29Sicilian, Nimzovich-Rubinstein variation2433.3%45.8%
B30Sicilian defense63722.1%52.5%
B31Sicilian, Nimzovich-Rossolimo attack (with ...g6, without ...d6)17626.1%56.8%
B32Sicilian defense10123.8%61.4%
B33Sicilian defense21222.6%50.0%
B34Sicilian, Accelerated Fianchetto, Exchange variation6813.2%55.1%
B35Sicilian, Accelerated Fianchetto, Modern variation with Bc49927.3%52.0%
B36Sicilian, Accelerated Fianchetto, Maroczy bind10032.0%51.0%
B37Sicilian, Accelerated Fianchetto, Maroczy bind, 5...Bg72429.2%47.9%
B38Sicilian, Accelerated Fianchetto, Maroczy bind, 6.Be36722.4%57.5%
B39Sicilian, Accelerated Fianchetto, Breyer variation3141.9%50.0%
B40Sicilian defense92822.6%52.3%
B41Sicilian, Kan variation6628.8%61.4%
B42Sicilian, Kan, 5.Bd324321.8%50.8%
B43Sicilian, Kan, 5.Nc313727.7%53.3%
B44Sicilian defense26926.0%51.7%
B45Sicilian, Taimanov variation37125.6%50.5%
B46Sicilian, Taimanov variation60723.7%55.5%
B47Sicilian, Taimanov (Bastrikov) variation98426.8%53.5%
B48Sicilian, Taimanov variation40226.9%51.7%
B49Sicilian, Taimanov variation18821.3%57.4%
B50Sicilian50123.4%54.8%
B51Sicilian, Canal-Sokolsky (Nimzovich-Rossolimo, Moscow) attack25225.8%55.0%
B52Sicilian, Canal-Sokolsky attack, 3...Bd724530.2%49.0%
B53Sicilian, Chekhover variation7435.1%48.6%
B54Sicilian19722.8%47.5%
B55Sicilian, Prins variation, Venice attack812.5%43.8%
B56Sicilian25022.0%55.8%
B57Sicilian, Sozin (not Scheveningen)12820.3%48.4%
B58Sicilian, Classical4725.5%51.1%
B59Sicilian, Boleslavsky variation, 7.Nb3333.3%50.0%
B60Sicilian, Richter-Rauzer5525.5%47.3%
B61Sicilian, Richter-Rauzer, Larsen variation, 7.Qd2185.6%41.7%
B62Sicilian, Richter-Rauzer, 6...e65427.8%45.4%
B63Sicilian, Richter-Rauzer, Rauzer attack17216.9%53.8%
B64Sicilian, Richter-Rauzer, Rauzer attack, 7...Be7 defense, 9.f420.0%100.0%
B65Sicilian, Richter-Rauzer, Rauzer attack, 7...Be7 defense, 9...Nxd41414.3%50.0%
B66Sicilian, Richter-Rauzer, Rauzer attack, 7...a6280820.6%47.9%
B67Sicilian, Richter-Rauzer, Rauzer attack, 7...a6 defense, 8...Bd727419.7%50.0%
B68Sicilian, Richter-Rauzer, Rauzer attack, 7...a6 defense, 9...Be7911.1%38.9%
B69Sicilian, Richter-Rauzer, Rauzer attack, 7...a6 defense, 11.Bxf610.0%100.0%
B70Sicilian, Dragon variation3327.3%53.0%
B71Sicilian, Dragon, Levenfish variation50.0%40.0%
B72Sicilian, Dragon, 6.Be33119.4%48.4%
B73Sicilian, Dragon, Classical, 8.O-O2218.2%59.1%
B74Sicilian, Dragon, Classical, 9.Nb31625.0%56.3%
B75Sicilian, Dragon, Yugoslav attack4131.7%50.0%
B76Sicilian, Dragon, Yugoslav attack, 7...O-O28023.2%48.4%
B77Sicilian, Dragon, Yugoslav attack, 9.Bc4812.5%56.3%
B80Sicilian, Scheveningen variation19017.9%47.9%
B81Sicilian, Scheveningen, Keres attack31820.4%53.3%
B82Sicilian, Scheveningen, 6.f46823.5%55.9%
B83Sicilian, Scheveningen, 6.Be216524.8%49.4%
B84Sicilian, Scheveningen (Paulsen), Classical variation93425.5%50.0%
B85Sicilian, Scheveningen, Classical variation with ...Qc7 and ...Nc62532.0%48.0%
B86Sicilian, Sozin attack1414.3%28.6%
B87Sozin with ...a6 and ...b52128.6%61.9%
B88Sicilian, Sozin, Leonhardt variation5527.3%39.1%
B89Sicilian, Sozin, 7.Be328017.1%50.7%
B90Sicilian, Najdorf344022.7%50.7%
B91Sicilian, Najdorf, Zagreb (Fianchetto) variation3026.7%50.0%
B92Sicilian, Najdorf, Zagreb (Fianchetto) variation48726.1%51.2%
B93Sicilian, Najdorf, 6.f45422.2%48.1%
B94Sicilian, Najdorf, 6.Bg52035.0%57.5%
B95Sicilian, Najdorf, 6...e62540.0%48.0%
B96Sicilian, Najdorf, 7.f42825.0%41.1%
B97Sicilian, Najdorf, 7...Qb654619.4%44.3%
B98Sicilian, Najdorf, 7...Be74216.7%34.5%
B99Sicilian, Najdorf, 7...Be7 Main line2317.4%60.9%
C00French defense131120.7%54.2%
C01French, Exchange variation44324.4%55.3%
C02French, Advance variation103219.7%52.8%
C03French, Tarrasch42122.6%54.5%
C04French, Tarrasch, Guimard Main line5117.6%57.8%
C05French, Tarrasch, Closed variation26520.8%56.4%
C06French, Tarrasch, Closed variation, Main line73526.7%51.2%
C07French, Tarrasch, Open variation95228.7%52.7%
C08French, Tarrasch, Open, 4.exd5 exd551530.5%50.8%
C09French, Tarrasch, Open variation, Main line62132.2%56.0%
C10French, Paulsen variation83225.0%51.6%
C11French defense337626.0%52.1%
C12French, MacCutcheon variation31317.9%53.0%
C13French, Classical4829.2%60.4%
C14French, Classical variation22121.3%55.0%
C15French, Winawer (Nimzovich) variation25426.8%57.9%
C16French, Winawer, Advance variation18723.5%56.7%
C17French, Winawer, Advance variation23322.7%52.6%
C18French, Winawer, Advance variation12821.1%53.5%
C19French, Winawer, Advance, 6...Ne7274322.5%58.9%
C20King's pawn game8920.2%51.7%
C21center game1323.1%65.4%
C22center game4320.9%59.3%
C23Bishop's Opening7619.7%45.4%
C24Bishop's Opening, Berlin defense11419.3%53.5%
C25Vienna game10521.9%44.3%
C26Vienna, Falkbeer variation18823.9%53.5%
C27Vienna game4613.0%45.7%
C28Vienna game348.8%66.2%
C29Vienna gambit, Kaufmann variation2711.1%61.1%
C30King's gambit7414.9%62.8%
C31KGD, Falkbeer counter-gambit1520.0%50.0%
C32KGD, Falkbeer, 5. dxe4250.0%25.0%
C33King's gambit accepted7522.7%40.7%
C34King's knight's gambit549.3%36.1%
C35KGA, Cunningham defense100.0%20.0%
C36KGA, Abbazia defense (Classical defense, Modern defense)3016.7%41.7%
C37KGA, Quaade gambit1921.1%31.6%
C38King's knight's gambit40.0%25.0%
C39King's knight's gambit2330.4%54.3%
C40King's knight Opening2321.7%58.7%
C41Philidor's defense31821.7%56.1%
C42Petrov's defense142526.9%54.1%
C43Petrov, Modern (Steinitz) attack56328.8%52.0%
C44King's pawn game26526.8%47.4%
C45Scotch game62322.8%49.9%
C46Three knights game39223.7%53.2%
C47Four knights, Scotch variation24227.3%52.1%
C48Four knights, Spanish variation43521.4%53.9%
C49Four knights, double Ruy Lopez32032.2%54.2%
C50King's pawn game55924.5%53.2%
C51Evans gambit declined3116.1%43.5%
C52Evans gambit1822.2%50.0%
C53Giuoco piano29821.8%52.2%
C54Guioco piano1414.3%42.9%
C55Two knights defense13322.6%54.9%
C56Two knights defense185.6%41.7%
C57Two knights defense6423.4%46.1%
C58Two knights defense2817.9%55.4%
C59Two knights defense7018.6%55.0%
C60Ruy Lopez9921.2%50.0%
C61Ruy Lopez, Bird's defense219.5%52.4%
C62Ruy Lopez, Old Steinitz defence4918.4%48.0%
C63Ruy Lopez, Schilemann defense3522.9%54.3%
C64Ruy Lopez, Classical (Cordel) defence9225.0%54.9%
C65Ruy Lopez, Berlin defense11829.7%55.5%
C66Ruy Lopez, Berlin defence, 4.O-O, d64835.4%55.2%
C67Ruy Lopez, Berlin defence, Open variation31428.3%53.3%
C68Ruy Lopez, Exchange variation11128.8%47.7%
C69Ruy Lopez, Exchange variation, 5.O-O12927.1%50.0%
C70Ruy Lopez,19024.2%51.6%
C71Ruy Lopez, Modern Steinitz defense2030.0%55.0%
C72Ruy Lopez, Modern Steinitz defense 5.0-03426.5%60.3%
C73Ruy Lopez, Modern Steinitz defense, Richter variation2437.5%43.8%
C74Ruy Lopez, Modern Steinitz defense2343.5%43.5%
C75Ruy Lopez, Modern Steinitz defense1442.9%64.3%
C76Ruy Lopez, Modern Steinitz defense, Fianchetto (Bronstein) variation2733.3%53.7%
C77Ruy Lopez, Morphy defence14524.8%53.1%
C78Ruy Lopez, 5.O-O28426.8%48.6%
C79Ruy Lopez, Steinitz defense deferred (Russian defence)4017.5%53.8%
C80Ruy Lopez, Open (Tarrasch) defence30228.8%46.2%
C81Ruy Lopez, Open, Howell attack50.0%80.0%
C82Ruy Lopez, Open, 9.c32429.2%64.6%
C83Ruy Lopez, Open, Classical defence728.6%57.1%
C84Ruy Lopez, Closed defense6829.4%47.1%
C85Ruy Lopez, Exchange variation doubly deferred (DERLD)3129.0%53.2%
C86Worrall attack4934.7%45.9%
C87Ruy Lopez, Closed, Averbach variation4314.0%51.2%
C88Ruy Lopez, Closed19724.9%45.9%
C89Ruy Lopez, Marshall counter-attack5619.6%42.0%
C90Ruy Lopez, closed (with ...d6)182125.4%53.2%
C91Ruy Lopez, closed, 9.d4237626.3%51.9%
C92Ruy Lopez, closed, 9.d410722.4%61.7%
C93Ruy Lopez, closed, Smyslov defense40.0%75.0%
C96Ruy Lopez, closed, 8...Na55232.7%64.4%
C97Ruy Lopez, Closed, Chigorin defense4219.0%59.5%
D00Queen's pawn game140619.4%51.9%
D01Richter-Veresov attack22226.6%48.9%
D02Queen's pawn game, 2. Nf3288022.6%52.2%
D03Torre attack, Tartakower variation20423.5%53.9%
D04Queen's pawn game27422.3%52.0%
D05Queen's pawn game, Zukertort variation38826.3%57.0%
D06Queen's Gambit4617.4%56.5%
D07QGD; Chigorin defense18719.3%58.3%
D08QGD; Albin counter-gambit3920.5%41.0%
D09QGD; Albin counter-gambit, 5.g32718.5%57.4%
D10QGD; Slav defense33426.0%53.1%
D11QGD; Slav defense, 3.Nf363021.9%52.7%
D12QGD; Slav defense, 4.e3 Bf544223.3%55.3%
D13QGD; Slav defense, Exchange variation17424.7%52.6%
D14QGD; Slav defense, Exchange variation12621.4%56.7%
D15QGD; Slav accepted, Exchange variation, 6.Bf4 Bf548021.3%51.3%
D16QGD; Slav accepted, Alapin variation7622.4%57.2%
D17QGD; Slav defense, Czech defence31225.3%55.0%
D18QGD; Dutch variation9431.9%54.3%
D19QGD; Dutch variation70321.9%58.3%
D20Queen's Gambit accepted59623.2%54.9%
D21QGA, 3.Nf313129.0%55.7%
D22QGA; Alekhine defense2718.5%50.0%
D23Queen's gambit accepted4615.2%53.3%
D24QGA, 4.Nc35822.4%50.9%
D25QGA, 4.e320625.2%53.4%
D26QGA; classical variation48724.2%50.3%
D27QGA; classical variation128027.9%53.4%
D28QGA; Classical variation 7.Qe26126.2%42.6%
D29QGA; Classical variation 8...Bb718923.8%48.9%
D30QGD74924.7%51.5%
D31QGD, 3.Nc346721.6%51.3%
D32QGD; Tarrasch defense6924.6%51.4%
D33QGD; Tarrasch, Schlechter-Rubinstein system4714.9%54.3%
D34QGD; Tarrasch, 7...Be742824.5%62.3%
D35QGD; 3...Nf628023.2%48.0%
D36QGD; Exchange, positional line, 6.Qc21030.0%45.0%
D37QGD; 4.Nf3190326.4%53.7%
D38QGD; Ragozin variation41726.9%53.5%
D39QGD; Ragozin, Vienna variation14927.5%46.0%
D40QGD; Semi-Tarrasch defense32930.7%46.7%
D41QGD; Semi-Tarrasch, 5.cd27726.7%57.8%
D42QGD; Semi-Tarrasch, 7.Bd37724.7%50.0%
D43QGD; Semi-Slav90621.5%49.8%
D44QGD; Semi-Slav 5.Bg5 dc42920.7%54.2%
D45QGD; Semi-Slav 5.e3219123.5%52.5%
D46QGD; Semi-Slav 6.Bd324224.8%55.8%
D47QGD; Semi-Slav 7.Bc4595026.6%53.8%
D48QGD; Meran, 8...a6125024.9%49.1%
D49QGD; Meran, 11. Nxb56714.9%40.3%
D50QGD; 4.Bg52227.3%40.9%
D51QGD; 4.Bg5 Nbd71315.4%23.1%
D52QGD18319.7%56.3%
D53QGD; 4.Bg5 Be73737.8%48.6%
D55QGD; 6.Nf314325.9%62.6%
D56QGD; Lasker defense10825.0%52.3%
D57QGD; Lasker defense, Main line1020.0%50.0%
D58QGD; Tartakower (Makagonov-Bondarevsky) system286328.7%52.0%
D59QGD; Tartakower (Makagonov-Bondarevsky) system, 8.cd Nxd59334.4%52.7%
D60QGD; Orthodox defense2817.9%44.6%
D61QGD; Orthodox defense, Rubinstein variation4422.7%50.0%
D62QGD; Orthodox defense, 7.Qc2 c5, 8.cd (Rubinstein)3336.4%54.5%
D63QGD; Orthodox defense, 7.Rc16521.5%52.3%
D64QGD; Orthodox defense, Rubinstein attack (with Rc1)1428.6%42.9%
D65QGD; Orthodox defense, Rubinstein attack, Main line520.0%30.0%
D66QGD; Orthodox defense, Bd3 line6119.7%57.4%
D67QGD; Orthodox defense, Bd3 line, Capablanca freeing manoever50.0%100.0%
D70Neo-Gruenfeld defense2020.0%60.0%
D71Neo-Gruenfeld, 5.cd475.0%37.5%
D72Neo-Gruenfeld, 5.cd, Main line30.0%0.0%
D73Neo-Gruenfeld, 5.Nf313926.6%52.2%
D74Neo-Gruenfeld, 6.cd Nxd5, 7.O-O5226.9%55.8%
D75Neo-Gruenfeld, 6.cd Nxd5, 7.O-O c5, 8.Nc33542.9%50.0%
D76Neo-Gruenfeld, 6.cd Nxd5, 7.O-O Nb62931.0%67.2%
D77Neo-Gruenfeld, 6.O-O7132.4%51.4%
D78Neo-Gruenfeld, 6.O-O c614223.2%53.2%
D79Neo-Gruenfeld, 6.O-O, Main line7731.2%50.6%
D80Gruenfeld defense4930.6%45.9%
D81Gruenfeld; Russian variation450.0%50.0%
D82Gruenfeld 4.Bf41330.8%61.5%
D83Gruenfeld gambit10.0%100.0%
D85Gruenfeld, exchange variation69630.0%47.6%
D86Gruenfeld, Exchange, Classical variation8122.2%49.4%
D87Gruenfeld, Exchange, Spassky variation3447.1%58.8%
D88Gruenfeld, Spassky variation, Main line, 10...cd, 11.cd1546.7%56.7%
D90Gruenfeld, Three knights variation8324.1%55.4%
D91Gruenfeld, Three knights variation17223.3%54.1%
D92Gruenfeld, 5.Bf410824.1%54.6%
D93Gruenfeld with 5. Bf4 O-O 6. e34626.1%54.3%
D94Gruenfeld, 5.e39924.2%50.5%
D95Gruenfeld with 5. e3 O-O 6. Qb3425.0%62.5%
D96Gruenfeld, Russian variation3023.3%55.0%
D97Gruenfeld, Russian variation with 7. e481224.6%58.5%
D98Gruenfeld, Russian, Smyslov variation4020.0%55.0%
D99Gruenfeld defense, Smyslov, Main line1729.4%55.9%
E00Queen's pawn game53924.9%51.8%
E01Catalan, closed4924.5%51.0%
E02Catalan, open, 5.Qa4650.0%41.7%
E04Catalan, Open, 5.Nf391026.5%50.7%
E05Catalan, Open, Classical line9929.3%57.1%
E06Catalan, Closed, 5.Nf363628.9%51.4%
E07Catalan, Closed, 6...Nbd74818.8%65.6%
E08Catalan, Closed, 7.Qc24717.0%48.9%
E09Catalan, Closed, Main line7628.9%56.6%
E10Queen's pawn game 3. Nf388525.3%54.7%
E11Bogo-Indian defense70624.2%54.6%
E12Queen's Indian defense154225.8%52.7%
E13Queen's Indian, 4.Nc3, Main line933.3%61.1%
E14Queen's Indian, 4.e327723.8%52.3%
E15Queen's Indian, 4.g3470924.7%54.3%
E16Queen's Indian, Capablanca variation7227.8%62.5%
E17Queen's Indian, 5.Bg2 Be714126.2%59.2%
E18Queen's Indian, Old Main line, 7.Nc314126.2%56.4%
E19Queen's Indian, Old Main line, 9.Qxc314721.8%57.1%
E20Nimzo-Indian defense14920.1%48.3%
E21Nimzo-Indian, Three knights variation18419.0%53.0%
E22Nimzo-Indian, Spielmann variation1118.2%36.4%
E23Nimzo-Indian, Spielmann, 4...c5, 5.dc Nc620.0%50.0%
E24Nimzo-Indian, Saemisch variation1323.1%34.6%
E25Nimzo-Indian, Saemisch variation, Keres variation4615.2%46.7%
E26Nimzo-Indian, Saemisch variation, 4. a3 Bxc3+ 5. bxc3 c5 6. e3933.3%50.0%
E27Nimzo-Indian, Saemisch variation, 5...0-0450.0%25.0%
E28Nimzo-Indian, Saemisch variation, 6. e3333.3%16.7%
E29Nimzo-Indian, Saemisch variation, Main line825.0%37.5%
E30Nimzo-Indian, Leningrad variation,4613.0%43.5%
E31Nimzo-Indian, Leningrad variation, main line714.3%64.3%
E32Nimzo-Indian, Classical variation88627.2%51.1%
E33Nimzo-Indian, Classical variation, 4...Nc63818.4%61.8%
E34Nimzo-Indian, Classical, Noa variation3638.9%58.3%
E35Nimzo-Indian, Classical, Noa variation, 5. cxd5 exd55724.6%47.4%
E36Nimzo-Indian, Classical, Noa variation, 5. a3633.3%33.3%
E37Nimzo-Indian, Classical, Noa variation, Main line, 7.Qc230.0%66.7%
E38Nimzo-Indian, Classical, 4...c53525.7%55.7%
E39Nimzo-Indian, Classical, Pirc variation4926.5%54.1%
E40Nimzo-Indian, 4.e34214.3%52.4%
E41Nimzo-Indian, 4.e3 c58315.7%42.8%
E42Nimzo-Indian, 4.e3 c5, 5.Ne2 (Rubinstein)9825.5%48.5%
E43Nimzo-Indian, Fischer variation2222.7%56.8%
E44Nimzo-Indian, Fischer variation, 5.Ne21520.0%56.7%
E45Nimzo-Indian, 4.e3, Bronstein (Byrne) variation825.0%50.0%
E46Nimzo-Indian, 4.e3 O-O3125.8%61.3%
E47Nimzo-Indian, 4.e3 O-O, 5.Bd31457.1%50.0%
E48Nimzo-Indian, 4.e3 O-O, 5.Bd3 d51729.4%55.9%
E49Nimzo-Indian, 4.e3, Botvinnik system2528.0%54.0%
E50Nimzo-Indian, 4.e3 e8g8, 5.Nf3, without ...d530.0%66.7%
E51Nimzo-Indian, 4.e3 e8g8, 5.Nf3 d7d53040.0%43.3%
E52Nimzo-Indian, 4.e3, Main line with ...b63221.9%48.4%
E53Nimzo-Indian, 4.e3, Main line with ...c53221.9%57.8%
E54Nimzo-Indian, 4.e3, Gligoric system with 7...dc4725.5%48.9%
E55Nimzo-Indian, 4.e3, Gligoric system, Bronstein variation59727.5%52.4%
E56Nimzo-Indian, 4.e3, Main line with 7...Nc61513.3%40.0%
E58Nimzo-Indian, 4.e3, Main line with 8...Bxc37128.2%49.3%
E59Nimzo-Indian, 4.e3, Main line175.9%55.9%
E60King's Indian defense81922.6%54.9%
E61King's Indian defense, 3.Nc310417.3%51.9%
E62King's Indian, Fianchetto variation22523.6%56.2%
E63King's Indian, Fianchetto, Panno variation37521.9%53.9%
E64King's Indian, Fianchetto, Yugoslav system4015.0%60.0%
E65King's Indian, Yugoslav, 7.O-O3426.5%42.6%
E66King's Indian, Fianchetto, Yugoslav Panno10521.0%55.2%
E67King's Indian, Fianchetto with ...Nd711127.0%53.2%
E68King's Indian, Fianchetto, Classical variation, 8.e433124.5%53.6%
E69King's Indian, Fianchetto, Classical Main line2040.0%40.0%
E70King's Indian, 4.e42934.5%48.3%
E71King's Indian, Makagonov system (5.h3)1926.3%39.5%
E72King's Indian with e4 & g350.0%20.0%
E73King's Indian, 5.Be22123.8%45.2%
E74King's Indian, Averbakh, 6...c530.0%33.3%
E76King's Indian, Four pawns attack2025.0%57.5%
E77King's Indian, Four pawns attack, 6.Be2425.0%62.5%
E80King's Indian, Saemisch variation119.1%50.0%
E81King's Indian, Saemisch, 5...O-O8220.7%50.6%
E82King's Indian, Saemisch, double Fianchetto variation10.0%100.0%
E83King's Indian, Saemisch, 6...Nc6170.0%47.1%
E84King's Indian, Saemisch, Panno Main line850.0%50.0%
E85King's Indian, Saemisch, Orthodox variation333.3%50.0%
E86King's Indian, Saemisch, Orthodox, 7.Nge2 c61216.7%66.7%
E87King's Indian, Saemisch, Orthodox, 7.d58122.2%63.0%
E88King's Indian, Saemisch, Orthodox, 7.d5 c6742.9%64.3%
E89King's Indian, Saemisch, Orthodox Main line333.3%83.3%
E90King's Indian, 5.Nf311720.5%52.1%
E91King's Indian, 6.Be213821.7%60.1%
E92King's Indian, Classical variation22424.1%52.2%
E93King's Indian, Petrosian system, Main line425.0%62.5%
E94King's Indian, Orthodox variation22028.2%55.5%
E95King's Indian, Orthodox, 7...Nbd7, 8.Re13423.5%44.1%
E97King's Indian, Orthodox, Aronin-Taimanov variation (Yugoslav attack / Mar del Plata variation)87920.6%57.3%
E98King's Indian, Orthodox, Aronin-Taimanov, 9.Ne12227.3%68.2%
E99King's Indian, Orthodox, Aronin-Taimanov, Main line1100.0%50.0%

Created in 2005-2012 by Kirill Kryukov
Updated on June 16, 2013