Rubinstein—Dr. Lasker, Moscow, 1925. Nimzowitsch gives the score through 34...P×P and states that White lost. His line beginning 35. B-Kt4 is illustrative analysis, not a continuation of the printed mainline.

1. 23…h6 Black took a strategically most interesting advantage of the weakness of White’s PQ4.
2. 25.h3 Since he wants to avoid the exchange of Q’s, Q-QB2; Q-QB1 would be of no use.
3. 26…Nd5 Threatening KtKt5.
4. 27…Nb6 Now White’s PQKt3 is become weak.
5. 31.Qc3 In his trouble he after all decides to submit to the exchange of queens; but succumbs to the reflex weaknesses which have now arisen.
6. 31…Bxf3+ QxB would fail on Q-B7; Q-QKt7, Kt-Q4!
7. 33…a4 And now the weakness of White’s Q side is evident.
8. 34…bxa4 White lost since the attempt to save himself by 35. B-Kt4, failed against 35. ....BxB; 36. PxB, P-R6; 37. Kt-Q2 and now 37. ....Kt-Q4, whereby the approach of the White K via K2, Q3, and QB4 is prevented (the answer to K-K2 would always be Kt-QB6ch). What is remarkable in this fine ending, in addition to the transference of the attack, is the masterly and varied use made of the point Q4.