Tuhia he haere tonu mo tenei whitianga - I whakamatauria e Karpov te 9...Nd7 i nga wa maha i te tukinga o te 1990 World Championship
, engari i tutuki i a Kasparov tetahi painga nui ki a ia i te keemu 18. He pakari engari he paku noa iho. Ko te 9...Nd7 e kiia ana ko te rereketanga o Chigorin na reira e rua nga rereketanga o te Ruy Lopez me taua ingoa, engari ko te 9...Na5 te nekehanga e pa ana ki a Chigorin. E mohiotia ana tenei parenga ko te Huringa Keres, i muri i a Paul Keres.