Rook tier · Endgame God · plays the London System
Magnus measures every middlegame by the endgame it might become. At 56 he has an enormous feel for which pawn structures win and which only look good, and his book against the London leads to the kind he likes: ...c5 and ...c4 give Black queenside space and a fixed pawn chain that grow in value as pieces leave the board.
He is comfortable trading queens early, and he tends to choose exchanges that improve his structure even if they cost a little activity. Sharp middlegames with kings under fire are not where he would choose to be, though he defends them soundly. What makes him most uncomfortable is a White player who refuses to simplify without a reason, keeping enough pieces on the board that technique cannot decide the game yet. Against Magnus, every trade is a decision, not a reflex. Ask what each one does to the pawn structure and to the endgame that would follow, and keep the game in the middlegame until you are ready.
At 2250 ELO, Magnus plays at master strength. Outright blunders are rare, so you need a sound opening, a clear plan and accurate calculation in sharp moments. A draw against him is a good result; a win means you played a very good game.
Against the London System (1.d4, Nf3 and an early Bf4) Magnus answers with ...d5 and ...Nf6, then hits the centre with ...c5. The plan is the most direct one Black has: pressure d4, bring the queen to b6 to eye b2, and push ...c4 to gain space on the queenside once White's queen has gone to b3.
1.d4 d5 2.Nf3 Nf6 3.Bf4 c5 4.e3 Nc6 5.c3 Qb6 6.Qb3 c4
Learn it move by move: London System walkthrough
Magnus's games train endgame foresight: judging trades by the endgames they lead to and keeping pieces on until simplification works for you.