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simaginbg4
Member since Apr-05-08 · Last seen Feb-11-21
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   simaginbg4 has kibitzed 3 times to chessgames  
   May-31-14 V Makogonov vs M Yudovich Sr., 1939
 
simaginbg4: This is a good example of the 'purely' positional exchange sacrifice. With 20 Rd6!? White invests the material in return for 1) threats against Black's king along the long diagonal (threats that cannot be directly consummated but which, it should be noted, led to the weakening of
 
   Apr-22-13 Kramnik vs Vitiugov, 2013 (replies)
 
simaginbg4: I was wondering about 27…Rd8, which would seem to have been the point of 26...b6. Evidently it was not played because of 28 Rxd8+ Bxd8 29 Qd6 Qxd6 30 Nxd6 Bxh4 31 gxh4 and thanks to the bad bishop, Black is defenseless against Nc8 winning a pawn. However, "defenseless" is not the
 
   Nov-21-10 Botvinnik vs B Laurentiev, 1926
 
simaginbg4: 56 Ka2 Rb2+ 57 Ka1 Bd4 is in fact threatening mate by 58... Re2+ 59 Kb1 60 a2+ and a1Q. White can try 58 Rh4 with the idea 58...Bxe5 59 h8Q; but instead Black will play 58...Bc3. It remains complicated, but I don't think White is winning. 
 
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