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 167
142 MAJOR TACTICS. EVOLUTION No. 19. FIGURE 123. Queen vs. Knight. Black. … White. A Knight posted at Kt 2 or Kt 7, and having to move, is lost if all the points on its periphery are contained in the sides of an adverse Queen's polygon.
Chess
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