Young, Franklin Knowles, 1857- [from old catalog] · Boston, Little, Brown, and company · leaf 151
White. 120 CHESS STRATEGETICS. A strategic horizon 10 is expressed by a straight lineformed by three points situated on the same horizontal,the extremities of which are either tactical keys orpoints of command in evolutions appertaining to theR or the Q, and the strategic key being any… … White. STRATEGIC HORIZONS. 121 A strategic horizon 11 is expressed by three adjacentpoints situated on the same horizontal, 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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