Zukertort Opening: Old Indian Attack with c5 – A Complete Guide

After 3.e4, White has claimed a bigger share of the centre with the pawn on e4, while Black's pawns on d5 and c5 pressure it from the side. The position is symmetrical in value — the engine gives +0.07, essentially equal — but the character of the game depends heavily on Black's next move. Your goals are straightforward: develop your kingside pieces, keep the king safe with a timely g3 and Bg2, and avoid hanging pawns or loose tactics. The most popular engine continuation (3...e6 Qe2 Be7 g3) shows a typical White setup: queen on e2 to support the e4 pawn, bishop on g2 to eye the centre, and a slow, patient build-up. There is no rush to force an advantage — this is a waiting-game opening where small positional details matter.

Black has several ways to meet 3.e4, and your response differs for each. Here are the two most popular choices and how White should handle them: - 3...dxe4 (33,265 games — the most common by far). Black takes immediately, and White scores only 44.4% after this. The simplest plan is to recapture with 4.dxe4, opening the d-file for your queen and rook. White then develops naturally: Nbd2, g3, Bg2, 0-0, and aims for a slight space advantage. The trade-off is that Black's position is solid; White must play actively to avoid being outplayed. - 3...d4 (13,965 games). Black pushes past, closing the centre. White scores 46.1% here. This is a different animal — you can prepare Nbd2, g3, Bg2, and then consider a timely b4 break or c3 to challenge Black's pawn chain. The game becomes about flank play rather than central clashes. The other replies (3...Nc6, 3...e6, 3...Nf6, 3...Bg4) each lead to distinct middlegames, but all are manageable with consistent development.

The statistics reveal a clear trap: 3...Bg4 is played in nearly 3,000 games, but the engine flags it as an inaccuracy costing about 0.7 pawns. The best move was 3...e6 instead. If your opponent pins your knight with ...Bg4, you should not panic — but you should also know that the computer thinks Black already made a small slip. Your simplest reply is 4.Be2 (defending the knight), after which Black's bishop can be a target. This knowledge is useful: if you face 3...Bg4, you can be confident that you are already slightly better than the position's true value. Don't overreach — just develop with Be2, 0-0, and take the small edge the engine says you have earned.

With 65,952 games in the database, the stats are reliable. White wins 45.7%, draws 4.7%, and Black wins 49.6%. That 4% difference is meaningful — Black is scoring slightly above 50% overall, which matches the fact that this line is theoretically equal but practically Black has been outplaying White in club play. Why? Likely because Black's responses (especially 3...dxe4) are straightforward, while White's quiet setup requires patience and a plan. Don't let the raw numbers discourage you: the engine says it's equal (+0.07). The key takeaway is to learn White's typical ideas in advance so you don't drift into passivity. The drill below will help you internalise the correct reactions to each of Black's replies.