The grand tactics of chess, an exposition of the laws and principles of chess strategetics, the practcal application of these laws and principles to the movement of forces; mobilization, development, manoeuvre, and operation (1898)
Young, Franklin Knowles, 1857- · Boston, Roberts brothers · leaf 116
87 OBJECTIVE PLANES. CLASS E comprises the four objective planes in which the adverse King is situated at Kt 2. The normal vulnerability of a plane of this class is 42 ; its normal mobility is 9. OBJECTIVE PLANES. Class E. FIG. 56. (Black.) … (White.) Vulnerability . . 42 Mobility . . 9 SUMMARY. Sum of Verticals and Horizontals .... 9 Sum of Diagonals 9 Sum of Obliques . . 24 Total 42 Sum of Points of Movement 9
Chess
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