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 72
Note.—The Front of Interference in this evolutionextends from Whites Q Kt 3 to K B 7. PLANE TOPOGRAPHY 49 The Point of Co-operation is that point which whenoccupied by the Supporting Factor enables the PrimeTactical Factor to occupy the Point of Command. V THE POINT OE CO-OPERATION.Figure 43. Blaeh. … White. Note. — The Point of Co-operation in this evolutionis the white square K R 8. 50 MAJOR TACTICS. The Point of Command is the centre of that geomet-ric sjanbol which appertains to the Prime TacticalFactor, and which, when occupied by the latter, wins anadverse piece, or checkmates the adverse…
Chess
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