▁authors ▁now ▁refer ▁to ▁it ▁as ▁the ▁K ras enk ow ▁System ; ▁he ▁himself ▁calls ▁it ▁the ▁Bag iro v ▁system . ▁K ras enk ow ' s ▁other ▁important ▁contribution ▁is ▁the ▁so - called ▁G ron ingen ▁Att ack ▁in ▁the ▁English ▁Open ing ▁( dis cover ed ▁simultaneously ▁with ▁V ad im ▁Z vi ag int se v ): ▁ 1 . N f 3 ▁N f 6 ▁ 2 . c 4 ▁e 6 ▁ 3 . N c 3 ▁B b 4 ▁ 4 . g 4 ! ? ▁ ▁Writ ings ▁K ras enk ow ▁has ▁written ▁several ▁books ▁on ▁ch ess ▁open ings ▁and ▁m idd leg ames : ▁The ▁Open ▁Spanish . ▁London , ▁Cad og an ▁Books , ▁ 1 9 9 5 ▁The ▁S ves hn ik ov ▁Sic ilian . ▁London , ▁Cad og an ▁Books , ▁ 1 9 9 6 ▁F inding ▁ch ess ▁j ew els . ▁London , ▁Ever yman ▁Ch ess , ▁ 2 0 1 3 ▁Lear n ▁from ▁Mich al ▁K ras enk ow . ▁L ande gem , ▁Think ers ▁Publishing , ▁ 2 0 1 9 ▁ ▁References ▁ ▁External ▁links ▁▁▁▁▁ ▁Category : 1 9 6 3 ▁birth s ▁Category : L iving ▁people ▁Category : S ports people ▁from ▁Moscow ▁Category : Ch ess ▁grand master s ▁Category : S ov iet ▁ch ess ▁players ▁Category : Russ ian ▁ch ess ▁players ▁Category : Pol ish ▁ch ess ▁players ▁Category