[Retros] Retro Section in Mat Plus

Mark Tilford ralphmerridew at gmail.com
Mon Sep 10 10:26:12 EDT 2007

Is there a summary of their exact notation anywhere? (I assume that S
refers to the knight, but I have no idea what the "not-equal 2 star
check check" or "not-equal 2 check dot dot dot" means.) I looked
through #26, but didn't notice any retros.

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