José Raúl Capablanca,
Chess fundamentals — Part I, Chapter II.Further Principles in End-Game Play9…
(1921)
“ In the position shown above, White can draw by playing P - Kt 4 according to the general rule that governs such cases, i.e. to advance the Pawn that is free from opposition. But suppose that White, either because he does not know this principle or because he does not, in this case, sufficiently appreciate the value of its application ”
