I dont think b3 was nesscerary.
Excellent - I only found the lovely b3 after trying nearly every other move! :-) I wonder whether Colle saw it - and if so when
b3 is wonderful... found it, but only because I saw yourbetteroffasian's kibitz. yes b3 is necessary... b3 gives White mating attacks using the White's Bishop access to the a3-f8 diagonal -- Black can't defend both the a3-f8 diagonal, and g7.
b3 is essential.
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