Semi-Slav Marshall Gambit: 4.e4 Triangle Weapon

The Semi-Slav Marshall Gambit is the Triangle Setup line 1.d4 d5 2.c4 c6 3.Nc3 e6 4.e4. White strikes in the centre before Black can choose the Noteboom with 4.Nf3 dxc4. Use the Marshall Entry diagram to fix the fork.

Black first builds the triangle with ...c6, ...d5 and ...e6. If White plays 4.e4, Black can reply 4...dxe4 and after 5.Nxe4 Bb4+ the Marshall Gambit appears. Use the Triangle Setup and Marshall Entry diagrams together.

The main line is 1.d4 d5 2.c4 c6 3.Nc3 e6 4.e4 dxe4 5.Nxe4 Bb4+ 6.Bd2 Qxd4 7.Bxb4 Qxe4+. Black grabs pawns while White relies on fast development and king pressure. Use the Queen Grab diagram before replaying Van Wely vs Krasenkow.

White plays 4.e4 to challenge the triangle immediately and avoid allowing a pure Noteboom after 4.Nf3 dxc4. It turns the opening into a central gambit where development matters more than material. Use the Marshall Entry diagram to see the central break.

Black plays 4...dxe4 to accept the central challenge and force White to prove compensation. After 5.Nxe4 Bb4+ Black often wins more material with ...Qxd4 and ...Qxe4+. Use the Queen Grab diagram to track Black's material-grabbing route.

After 5.Nxe4 Bb4+, 6.Bd2 is the principled main line. White allows 6...Qxd4 7.Bxb4 Qxe4+ and then tries to use development, open lines and king exposure. Replay Bacrot vs Morozevich to study the attacking version of this line.

After 5.Nxe4 Bb4+, 6.Nc3 is a practical alternative used in Carlsen-Anand, Chennai 2013. It avoids the immediate Bd2 queen-grab main line and often heads for a more positional fight. Use the 6.Nc3 diagram and replay Carlsen vs Anand.

After the queen-grab main line, White often chooses a bishop retreat such as 9.Ba5 or 9.Bd6. 9.Ba5 keeps pressure with Qd8+ ideas, while 9.Bd6 aims for fast central and kingside activity. Use the 9.Ba5 and 9.Bd6 replay groups to compare the plans.

The Marshall Gambit is playable and dangerous, but it is not a simple refutation of the triangle. White often has compensation rather than a guaranteed advantage. Use the Black defensive model games to see why precision matters.

Yes, it is dangerous for Black because one slow or greedy move can leave the king trapped and the queen misplaced. The material count can look good while the position collapses tactically. Replay Van Wely vs Krasenkow or Bacrot vs Filippov to see the danger.

It can be a strong practical weapon for club players who like initiative and are willing to study forcing lines. It is less suitable for players who dislike early material imbalance. Use the adviser to choose whether you want the 6.Bd2 attack or the 6.Nc3 practical route.

Black must know that 4.e4 allows the Marshall Gambit and can become very sharp. If Black only prepared the Noteboom, the Marshall fork can be an unpleasant surprise. Use this page with the Triangle Setup page before choosing the triangle as Black.

Instead of 4...dxe4, Black can sometimes play 4...Bb4 immediately. This keeps a pin and may transpose to related pawn-sacrifice structures, but it is not the same as the main queen-grab Marshall line. Replay Lautier vs Zvjaginsev or Vitiugov vs Georgiev to study it.

The Marshall Gambit starts after White's 4.e4 and becomes a central tactical fight. The Noteboom starts after 4.Nf3 dxc4 and becomes a queenside-passer race. Use the related Noteboom link after studying the Queen Grab diagram.

White's main attacking idea is rapid development, rook activity and pressure against Black's king before Black consolidates the extra material. The d-file and dark-square weaknesses are common themes. Replay Van Wely vs Krasenkow to see White's initiative become decisive.

Black's main defensive idea is to return or consolidate material while completing development and neutralising White's initiative. If Black survives the first wave, the extra pawns can matter. Replay Van Wely vs Shirov or Li Chao vs Shulman to see Black survive and convert.

Start with Van Wely vs Krasenkow for the 9.Ba5 attacking model, then Bacrot vs Morozevich for the 9.Bd6 attacking model, and Carlsen vs Anand for the practical 6.Nc3 line. Use the replay selector in that order.

The biggest mistake is counting pawns instead of tempi. Black can be several pawns up and still losing if the king is exposed, while White can overreach if the attack is not concrete. Use the adviser output to pick the side-specific risk first.

Yes, this page should link back to the Triangle Setup because the Marshall Gambit is one branch of the triangle fork. The parent page explains why 4.e4, 4.Nf3 and 4.e3 are the key choices. Use the related Triangle link to rebuild the full move-order picture.

Remember that 4.e4 is White's direct answer to the triangle. It prevents Black from quietly choosing the Noteboom and forces a central gambit where time, king safety and exact calculation dominate. Use the four diagrams as your final memory map.