As we have already seen in the preceding example, in these endings there are some prospects of winning only if pawns have advanced very far. Then by a pawn sacrifice a strong passed pawn will be created which will either promote into the queen or participate in the execution of a mating attack. When blockaded pawns are nearer to the centre, defence by stalemate is ruled out. As a consequence, the weaker side must defend very accurately. In this regard, the ending of the game Anderssen – Steinitz, London, 1866, is very instructive.
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