I think that there in fact is no single, 100% unified initiative "system" in 1st ed. AD&D. Claim to be using everything "as written", and with as much justification so can someone doing it differently. There are lacunae that absolutely require interpretation, and if there were a non-arbitrary, clearly correct interpretation ... then we should not have had 30 years of debates with no end in sight.Eventually, we redid the initiative system (because we really didn't understand it)
The 1st ed. Advanced books assumed a "basic" familiarity with Dungeons & Dragons. There was a reminder of the real rule in the PHB:
Although it was implied that one would refer to the Chainmail miniatures rules, there was no initiative system in the D & D books prior to Supplement III (which presented a complex precursor to those later found in Starfleet Battles and Champions). Holmes Basic used Dexterity, while later Basic sets presented the "d6 for each side, high roll goes first" fundamental from Chainmail.Your DM will adjudicate such matters with common sense.
That is still the fundamental in 1st ed. AD&D; the rest is commentary. The one big tangled snarl in that commentary has to do with spell-casting. In particular, the issue is how the dice-rolls, spell casting times in segments, and weapon attacks (especially versus spell-casters work).
At the end of the day, you've just got to decide for yourself what the cryptic phrase "whichever is applicable" means, and how to harmonize p. 65 with pp. 66-67 ... or else just use whatever works for you.
It is most reasonable to assume that Gygax had something more coherent in mind, but that somewhere in the course of writing and editing it got lost. The text was never corrected, though, and "what Gary said" depends on when he was asked!
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