2e specialist mages

[Felix]

In 2e AD&D, if a mage specialized in a school, there was an opposed school whose spells he could not cast. Does anyone have their 2e PHB handy to tell me what which schools opposed one another? I seem to remember some kind of compass around which the schools were positioned...

 

[Pierson_Lowgal]

Abjuration: Alteration & Illusion
Conjuration: Gr. Divination & Invocation
Diviner: Conjuration
Enchanter: Evocation & Necromancy
Illusionist: Necromancy, Evocation, Abjuration
Invoker/Evoker: Echantment/Charm & Conjuration
Necromancy: Illusion & Enchantment/Charm
Transmuter: Abjuration & Necromancy