Why can't you lose a chess game in which you can make $2$ legal moves at once?
While some of the details of the rules may still be ambiguous in boundary situations, it is clear that white can avoid a loss by opening with
- ♘b1-c3,♘c3-b1
or
- ♘g1-f3,♘f3-g1
More precisely, if either of these no-ops in fact leads to a position where black can force a win, then white could force a win by playing by black's strategy mirrored.
With the new condition that I will start as white pieces and my opponent (Magnus Carlsen in this case) as black pieces, Scholar's Mate can guarantee a win in 4 moves.
The Scholar's Mate is a 4 move mate meaning black has to play pawn e6 or pawn d5, which is a move only delaying the inevitable mate.