72 The Chess Combination from Philidor to Karpov The familiar Steinitz treatment.
A severe positional error (always capture towards the centre is one of the better "rules") in that Black irretrievably weakens the a2-g8 diagonal on which his K is situated. After 13 ... RPXP White has nothing immediate.
14 PXP NXP
White controls two powerful open lines towards the Black K and, in view of Tchigorin's lack of counterplay, it only remains for Steinitz to mobilize the remainder of his forces before the decisive attack will inevitably materialize.
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