Change `Russian game` for `Petrov's Defence`

[SergioGlorias]

Change `Russian game` for `Petrov's Defence`

[niklasf]

Would Pretov's Defense be a correct replacement for all the subvariations, too?

c.tsv
604:C42 Russian Game    1. e4 e5 2. Nf3 Nf6
605:C42 Russian Game    1. e4 e5 2. Nf3 Nf6 3. Nxe5
606:C42 Russian Game    1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6
607:C42 Russian Game    1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3
608:C42 Russian Game    1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4
609:C42 Russian Game: Classical Attack  1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4
610:C42 Russian Game: Classical Attack, Berger Variation        1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O Nc6 8. Re1 Bg4 9. c3 f5 10. Nbd2
611:C42 Russian Game: Classical Attack, Chigorin Variation      1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O Nc6 8. Re1
612:C42 Russian Game: Classical Attack, Chigorin Variation, Browne Attack       1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. O-O Be7 8. c4 Nb4 9. cxd5
613:C42 Russian Game: Classical Attack, Chigorin Variation, Main Line   1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. O-O Be7 8. c4 Nb4 9. Be2
614:C42 Russian Game: Classical Attack, Closed Variation        1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 Nf6
615:C42 Russian Game: Classical Attack, Jaenisch Variation      1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. O-O Be7 8. c4
616:C42 Russian Game: Classical Attack, Krause Variation        1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. O-O Be7 8. Re1 Bg4 9. c3 f5 10. c4
617:C42 Russian Game: Classical Attack, Marshall Trap   1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6 7. O-O O-O 8. c4 Bg4 9. cxd5 f5 10. Re1 Bxh2+
618:C42 Russian Game: Classical Attack, Marshall Variation      1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6
619:C42 Russian Game: Classical Attack, Marshall Variation, Chinese Gambit      1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6 7. O-O O-O 8. c4 c6 9. Re1 Bg4
620:C42 Russian Game: Classical Attack, Maróczy Variation       1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O Nc6 8. Re1 Bg4 9. c3 f5 10. c4 Bh4
621:C42 Russian Game: Classical Attack, Mason Variation 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O O-O
622:C42 Russian Game: Classical Attack, Mason-Showalter Variation       1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6
623:C42 Russian Game: Classical Attack, Staunton Variation      1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6 7. O-O O-O 8. c4 c6
624:C42 Russian Game: Classical Attack, Tarrasch Variation      1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6 7. O-O O-O 8. c4 Bg4
625:C42 Russian Game: Cochrane Gambit   1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nxf7
626:C42 Russian Game: Cochrane Gambit, Bishop Check Line        1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nxf7 Kxf7 5. Bc4+
627:C42 Russian Game: Cochrane Gambit, Center Variation 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nxf7 Kxf7 5. d4
628:C42 Russian Game: Cozio Attack      1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. Qe2
629:C42 Russian Game: Damiano Variation 1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nxe4
630:C42 Russian Game: Damiano Variation, Kholmov Gambit 1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nxe4 4. Qe2 Qe7
631:C42 Russian Game: French Attack     1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d3
632:C42 Russian Game: Italian Variation 1. e4 e5 2. Nf3 Nf6 3. Bc4
633:C42 Russian Game: Karklins-Martinovsky Variation    1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nd3
634:C42 Russian Game: Kaufmann Attack   1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. c4
635:C42 Russian Game: Millennium Attack 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. Bd3
636:C42 Russian Game: Moody Gambit      1. e4 e5 2. Nf3 Nf6 3. Qe2 Nc6 4. d4
637:C42 Russian Game: Nimzowitsch Attack        1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. Nc3
638:C42 Russian Game: Paulsen Attack    1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nc4
639:C42 Russian Game: Stafford Gambit   1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nc6
640:C42 Russian Game: Stafford Gambit   1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nc6 4. Nxc6 dxc6
641:C42 Russian Game: Three Knights Game        1. e4 e5 2. Nf3 Nf6 3. Nc3
644:C43 Russian Game: Modern Attack     1. e4 e5 2. Nf3 Nf6 3. d4
645:C43 Russian Game: Modern Attack     1. e4 e5 2. Nf3 Nf6 3. d4 exd4
646:C43 Russian Game: Modern Attack, Bardeleben Variation       1. e4 e5 2. Nf3 Nf6 3. d4 exd4 4. e5 Ne4 5. Qe2 Nc5 6. Nxd4 Nc6
647:C43 Russian Game: Modern Attack, Center Attack      1. e4 e5 2. Nf3 Nf6 3. d4 exd4 4. e5 Ne4 5. Qxd4
648:C43 Russian Game: Modern Attack, Center Variation   1. e4 e5 2. Nf3 Nf6 3. d4 Nxe4 4. Bd3
649:C43 Russian Game: Modern Attack, Murrey Variation   1. e4 e5 2. Nf3 Nf6 3. d4 Nxe4 4. Bd3 Nc6
650:C43 Russian Game: Modern Attack, Steinitz Variation 1. e4 e5 2. Nf3 Nf6 3. d4 exd4 4. e5 Ne4 5. Qe2
651:C43 Russian Game: Modern Attack, Symmetrical Variation      1. e4 e5 2. Nf3 Nf6 3. d4 d5
652:C43 Russian Game: Modern Attack, Tal Gambit 1. e4 e5 2. Nf3 Nf6 3. d4 exd4 4. e5 Ne4 5. Bb5
653:C43 Russian Game: Modern Attack, Trifunovic Variation       1. e4 e5 2. Nf3 Nf6 3. d4 Nxe4 4. Bd3 d5 5. Nxe5 Bd6 6. O-O O-O 7. c4 Bxe5

[SergioGlorias]

yes

[niklasf]

It does seem to be the more common name. Changed.