The major tactics of chess: a treatise on evolutions; the proper employment of the forces in strategic, tactical, and logistic planes (1898)
Young, Franklin Knowles, 1857- · Boston, Little, Brown and company · leaf 61
White. Note. — The Piece Exposed always is situated eitherupon one of the sides or at one of the vertices of thezone of evolution. 38 MAJOR TACTICS. A Disturbing Integer is an adverse piece whichprevents the Prime Tactical Factor from occupying thePoint of Command, or the Supporting Factor… … miHe. Note. — A Disturbing Factor may or may not be situ-ated within the zone of evolution. PLANE TOPOGRAPHY. 39 The Primary Origin is that point which, at thebeginning of an evolution, is occupied by the PrimeTactical Factor. THE PRIMAEY ORIGIN, (P. 0.) Figure 33. Blach.
Chess
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