Young, Franklin Knowles, 1857- [from old catalog] · Boston, Little, Brown, and company · leaf 144
White. STRATEGIC HORIZONS. 113 A strategic horizon 3 is expressed by a trianglecomposed of the obliques which unite the centres ofthree knights octagons, the extremities being pointsof command in evolutions appertaining to the knight,and the vertex being the strategic key. This horizonis designated… … White. 114 CHESS STRATEGETICS. A strategic horizon 4 is expressed by an oblique line,upon which are located tlie centres of three knightsoctagons, the extremities being either tactical keys orpoints of command in evolutions appertaining to theKt, and the central point being the strategic key.…
Chess
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