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 108
P.) when thepiece to which it appertains has the right of move inthe given situation; otherwise it is negative (G. S. N.) In all situations wherein the Exposed Piece has theright of move the Point Material is active (P. M. A.),and in all other cases the Point Material is passive(P. M. P.). BASIC… … White.Either to moTe and win a piece. 86 MAJOR TACTICS. Figure 73.(6.) Black.
Chess
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