7 ▁Ke 8 ▁ 5 0 . ▁N c 7 + ▁K f 8 ▁ 5 1 . ▁N b 5 ▁N x b 5 ▁ 5 2 . ▁R x b 5 ▁Ra 8 ▁ 5 3 . ▁f 4 ▁a 4 ▁ 5 4 . ▁R b 1 ▁a 3 ▁ 5 5 . ▁f 5 ▁a 2 ▁ 5 6 . ▁Ra 1 ▁Ra 4 + ▁ 5 7 . ▁Kh 5 ▁K g 7 ▁ 5 8 . ▁f xe 6 ▁f xe 6 ▁ 5 9 . ▁R g 1 + ▁Kh 8 ▁ 6 0 . ▁Ra 1 ▁Kh 7 ▁ 6 1 . ▁R g 1 ▁a 1 = Q ▁ 6 2 . ▁R g 7 + ▁Kh 8 ▁ ▁Cont ribution s ▁to ▁opening ▁theory ▁A ▁number ▁of ▁ch ess ▁open ings ▁are ▁named ▁after ▁T arr as ch , ▁with ▁the ▁most ▁notable ▁being : ▁The ▁T arr as ch ▁Def ense , ▁T arr as ch ' s ▁favorite ▁line ▁against ▁the ▁Queen ' s ▁G amb it ▁in ▁which ▁Black ▁takes ▁on ▁an ▁isolated ▁queen ' s ▁pa wn : ▁ 1 . d 4 ▁d 5 ▁ 2 . c 4 ▁e 6 ▁ 3 . N c 3 ▁c 5 ! ? ▁ 4 . cx d 5 ▁ex d 5 . ▁A ▁main ▁line ▁is ▁then ▁ 5 . N f 3 ▁N c 6 ▁ 6 . g 3 ▁N f 6 ▁ 7 . B g