Anderssen's preparations for the 1851 London International Tournament produced a surge in his playing strength: he played over 100 games in early 1851 against strong opponents including Carl Mayet, Ernst Falkbeer, Max Lange and Jean Dufresne. The 1851 International Tournament was a knock-out event in which pairs of competitors played short matches, and Anderssen won it by beating Lionel Kieseritzky, József Szén, Staunton, and Marmaduke Wyvill – by margins of at least two games in every case. His prize was two-thirds of the total prize fund of £500, i.e. about £335; that is equivalent to about £240,000 ($370,200) in 2006's money. When Anderssen and Szén found they were to play each other, they agreed that, if either won the tournament, the other would receive one-third of the prize; this does not appear to have been considered in any way unethical.