Know your first ten moves cold.

Starts 1.e4 e5 2.Nf3 Nc6 3.Bc4. 600 lines, up to move 16. Covers 98% of master games. ECO C50–C55.

ECO C50–C55

Starts 1.e4 e5 2.Nf3 Nc6 3.Bb5. 600 lines, up to move 18. Covers 99% of master games. ECO C60–C99.

ECO C60–C99

Starts 1.d4. 778 lines, up to move 16. Covers 99% of master games. ECO A43–E97.

ECO A43–E97

Starts 1.d4. 1049 lines, up to move 16. Covers 99% of master games. ECO A40–E97.

ECO A40–E97

Starts 1.e4 e5 2.Nf3 Nc6 3.d4. 165 lines, up to move 16. Covers 100% of master games. ECO C44–C62.

ECO C44–C62

Starts 1.e4 e5 2.Nc3. 85 lines, up to move 12. Covers 100% of master games. ECO C25–C47.

ECO C25–C47

Starts 1.c4. 1500 lines, up to move 16. Covers 81% of master games. ECO A04–E97.

ECO A04–E97

Starts 1.d4. 561 lines, up to move 16. Covers 97% of master games. ECO D34–E18.

ECO D34–E18

Starts 1.e4 c5. 600 lines, up to move 16. Covers 87% of master games. ECO B20–B97.

ECO B20–B97

Starts 1.e4 c6. 600 lines, up to move 16. Covers 98% of master games. ECO B10–E54.

ECO B10–E54

Starts 1.e4 e6. 424 lines, up to move 16. Covers 99% of master games. ECO C00–C19.

ECO C00–C19

Starts 1.e4 d5. 277 lines, up to move 16. Covers 100% of master games. ECO B00–D00.

ECO B00–D00

Starts 1.d4 Nf6. 523 lines, up to move 16. Covers 98% of master games. ECO A65–E99.

ECO A65–E99

Starts 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4. 390 lines, up to move 16. Covers 99% of master games. ECO E20–E59.

ECO E20–E59

600 lines, up to move 16. Covers 93% of master games. ECO A50–E10.

ECO A50–E10

Starts 1.e4 e5 2.Nf3 Nf6. 353 lines, up to move 16. Covers 99% of master games. ECO C42–C55.

ECO C42–C55

Starts 1.e4 e5 2.f4. 75 lines, up to move 11. Covers 90% of master games. ECO C30–C39.

ECO C30–C39

Starts 1.d4 d5. 476 lines, up to move 16. Covers 99% of master games. ECO D10–D23.

ECO D10–D23

Starts 1.d4 Nf6. 417 lines, up to move 16. Covers 99% of master games. ECO A56–E60.

ECO A56–E60

Starts 1.d4 f5. 524 lines, up to move 15. Covers 98% of master games. ECO A80–A99.

ECO A80–A99

Starts 1.e4 d6 2.d4 Nf6. 374 lines, up to move 14. Covers 99% of master games. ECO B00–B09.

ECO B00–B09

Starts 1.e4 Nf6. 300 lines, up to move 16. Covers 99% of master games. ECO B02–B05.

ECO B02–B05

216 lines, up to move 16. Covers 99% of master games. ECO A43–A79.

ECO A43–A79

Starts 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4. 28 lines, up to move 13. Covers 100% of master games. ECO C51–C52.

ECO C51–C52

Starts 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4. 87 lines, up to move 16. Covers 100% of master games. ECO C44–C56.

ECO C44–C56

Starts 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5. 29 lines, up to move 16. Covers 100% of master games. ECO C57–C58.

ECO C57–C58

Starts 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5. 72 lines, up to move 15. Covers 100% of master games. ECO C48–C62.

ECO C48–C62

Starts 1.e4 e5 2.Bc4. 600 lines, up to move 16. Covers 92% of master games. ECO C23–C56.

ECO C23–C56

Starts 1.e4 e5 2.d4 exd4 3.Qxd4 Nc6 4.Qe3. 14 lines, up to move 10. Covers 100% of master games. ECO C22.

ECO C22

Starts 1.e4 c5 2.Nf3. 980 lines, up to move 16. Covers 97% of master games. ECO B27–B90.

ECO B27–B90

Starts 1.e4 c5 2.d4 cxd4 3.c3. 350 lines, up to move 16. Covers 97% of master games. ECO B21–B22.

ECO B21–B22

Starts 1.e4 c5 2.c3. 275 lines, up to move 16. Covers 98% of master games. ECO B22.

ECO B22

Starts 1.e4 c5 2.Nf3 d6 3.Bb5+. 190 lines, up to move 16. Covers 100% of master games. ECO B51–B52.

ECO B51–B52

Starts 1.e4 c6 2.d4. 270 lines, up to move 16. Covers 100% of master games. ECO B06–B15.

ECO B06–B15

Starts 1.e4 e6 2.d4. 443 lines, up to move 16. Covers 97% of master games. ECO C00–C19.

ECO C00–C19

Starts 1.e4 d5 2.exd5. 167 lines, up to move 16. Covers 100% of master games. ECO B01.

ECO B01

Starts 1.d4 Nf6 2.Bg5. 182 lines, up to move 13. Covers 100% of master games. ECO A45.

ECO A45

Starts 1.d4. 1151 lines, up to move 16. Covers 98% of master games. ECO A40–E97.

ECO A40–E97

Starts 1.Nf3. 1500 lines, up to move 16. Covers 80% of master games. ECO A04–E97.

ECO A04–E97

Starts 1.b3. 257 lines, up to move 14. Covers 98% of master games. ECO A01–E14.

ECO A01–E14

Starts 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2. 198 lines, up to move 16. Covers 97% of master games. ECO E91–E97.

ECO E91–E97

Starts 1.e4 e5. 803 lines, up to move 16. Covers 98% of master games. ECO C20–C99.

ECO C20–C99

Starts 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6. 264 lines, up to move 16. Covers 100% of master games. ECO C55–C59.

ECO C55–C59

Starts 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6. 490 lines, up to move 16. Covers 98% of master games. ECO B87–B97.

ECO B87–B97

Starts 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6. 301 lines, up to move 16. Covers 98% of master games. ECO B70–B79.

ECO B70–B79

Starts 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6. 214 lines, up to move 16. Covers 99% of master games. ECO B32–B77.

ECO B32–B77

Starts 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6. 184 lines, up to move 16. Covers 98% of master games. ECO B41–B85.

ECO B41–B85

Starts 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6. 328 lines, up to move 16. Covers 98% of master games. ECO B44–B85.

ECO B44–B85

Starts 1.e4 e5 2.Nf3 d6. 219 lines, up to move 16. Covers 100% of master games. ECO C41.

ECO C41

Starts 1.e4 g6 2.d4 Bg7. 600 lines, up to move 16. Covers 75% of master games. ECO A41–E98.

ECO A41–E98

Starts 1.d4 d5 2.c4 dxc4. 306 lines, up to move 16. Covers 98% of master games. ECO D20–D48.

ECO D20–D48

600 lines, up to move 16. Covers 77% of master games. ECO D10–D47.

ECO D10–D47

Starts 1.d4 d5 2.c4 e6 3.Nc3 c5. 67 lines, up to move 16. Covers 100% of master games. ECO D32–D34.

ECO D32–D34

Starts 1.d4 Nf6 2.c4 e6 3.Nf3 b6. 353 lines, up to move 16. Covers 97% of master games. ECO E12–E43.

ECO E12–E43

Starts 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+. 194 lines, up to move 16. Covers 99% of master games. ECO E11–E43.

ECO E11–E43

Starts 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4. 68 lines, up to move 14. Covers 100% of master games. ECO A52.

ECO A52

Starts 1.d4 Nf6 2.c4 c5 3.d5 b5. 307 lines, up to move 16. Covers 100% of master games. ECO A57–A59.

ECO A57–A59

Starts 1.d4 Nf6. 155 lines, up to move 14. Covers 100% of master games. ECO A45–A48.

ECO A45–A48

Starts 1.e4 e5 2.Nc3 Nf6. 151 lines, up to move 16. Covers 99% of master games. ECO C24–C55.

ECO C24–C55