Young, Franklin Knowles, 1857- [from old catalog] · Boston, Little, Brown, and company · leaf 153
White. 122 CHESS STRATEGETICS. A strategic horizon 12 is expressed by a straight lineformed by three points situated in the same vertical,the extremities being either tactical keys or points ofcommand in evolutions appertaining to the R or theQ, and the strategic key being any point between.This… … White. STRATEGIC HORIZONS. 123 A strategic horizon 13 is expressed by three adjacentpoints situated on the same vertical, the central onebeing the strategic key and the extremities being eithertactical keys or points of command in evolutions apper-taining to the R, Q, or K. This horizon is…
Chess
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