The slow build-up
Defend e4 with pawns and castle before opening the centre.
When Black brings the bishop to c5, you play and : the d3 pawn supports e4 and the c3 pawn prepares a later advance to d4. Before opening the centre, develop your pieces and castle with . With Black's bishop on c5, don't push the d3 pawn to d4 while your king is still on e1: Black exchanges on d4, checks from b4 and your king loses the right to castle.
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Over-the-board games, 2300+: 61% of 576. Online, 2200+: 39% of 1,430.