Hikaru builds a London system wall, but not moving c4 pawn which he has other plans for. Suddenly he changes plan and pushes pan to d5 grabbing a lot of space for his pieces. Black kind of loose time and start to loose breath, as White is pushing forward space wise.
The London involves the moves: d4, Nf3, Bf4 and e3. Unlike the Colle System, White develops his dark-squared bishop outside of the pawn chain. His next few moves will change depending on the set-up that Black chooses. In general, White has two approaches
Black plays …c7-c5 and White responds c2-c3. White will later develop Nbd2;
Black does not play …c7-c5 and White hits with c2-c4. White will generally later develop with Nc3.
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In both cases, either before or after White moves his c-pawn, he will also develop his light-squared bishop to e2 or d3. Normally if Black may play…e7-e5 in the future, White will place his bishop on e2 in order to avoid a potential fork if Black plays …e5-e4.
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Blitz chess (also known as speed or fast chess) is a type of chess in which each player is given less time to consider their moves than normal tournament time controls allow. Openings, tactics and strategy are same.