Domdaniel: A sad loss in what could have been Duchamp's finest game. After a quiet opening, White threads his way to a clear advantage after 12 moves, with pressure on c5 and surprising threats to Black's King.
13.Rc4! was the strongest way to pursue the attack, with ideas like 13...b5?! 14.Rh4 Qf5 15.Qc1! f6 16.Nf1! (16.Nd4 wins the Exchange, but this is stronger) g5?! 17.Ne3 Qg6 18.Rh6! Kxh6 19.Nh4! winning, eg 19...gxh4 20.Nf5+ and mate in 3.
Of course Black can play more solidly, but White has an excellent game after 13...f6 14.Qc1 etc.
In the game, Duchamp found a sharp combination of a double-edged kind that foreshadows Tal. After winning Black's Queen he could have won simply with 22.Re4, when Black's Bishop is trapped and his other pieces are too slow to generate counterplay. But Marcel blundered away the win with 22.Rh4? - an all too plausible move after brain-wrecking calculations, with a win in sight - and, obviously in shock, missed some drawing chances to reach a lost ending.
The mechanical bride stripped bare.