The massive popularity of internet blitz means that I should address its effects on those who would like to improve. Actually it’s a complex issue and there probably isn’t a single answer that is right for everyone.
In general I think we should avoid mammoth blitz sessions into the wee small hours, especially when accompanied by a bottle of whisky. But for many players with busy lives it can be their only means of chess practice and as such can help them stay in shape.
Are the benefits of blitz strength related? Well my take is that weaker players should spend longer thinking over their moves because the quality of their thought is unlikely to be improved by adding speed. There again most Grandmasters seem to benefit without negative effects and here are a couple of outstanding blitz players indulging themselves: