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 149
SIMPLE TACTICAL PLANES. EVOLUTION No. 1. FIGURE 105. Pawn vs. Pawn. Black. … White. When two opposing pawns are situated on adjacent verticals and each on its Primary Base Line, that side which has not the move wins the adverse pawn.
Chess
Internet Archive · University of California Libraries · Public domain (published before 1931). Free to use for anything.