The Bishop's Opening and The Urusov Gambit System by Michael Goeller

Welcome to The Urusov Gambit System, a constellation of web sites devoted to the Urusov Gambit (1.e4 e5 2.Bc4 Nf6 3.d4 exd4 4.Nf3) and all related lines. Follow the links below (or in the navigation bar at the top of the page) to explore some fun analysis, games, and chess history. And be sure to check out the extensive links to other web sites. 
1-The Bishop's Opening covers 1.e4 e5 2.Bc4 with all Black alternatives to 2....Nf6. The focus is on exciting gambit lines, so don't expect to find anything pianisimo here. The idea is to help you play against people afraid to enter the Urusov zone.
2-The Urusov Gambit covers play after 1.e4 e5 2.Bc4 Nf6 3.d4 with attention to 3....exd4 4.Nf3, the Urusov Gambit proper. This is the most extensive analysis of the Urusov available anywhere in print, with a great collection of games. If you like to play the Urusov Gambit, you've come to the right place. 
The little-known 3-Dimock Theme Tournament of 1924 featured such famous American players as Marshall, Torre, and Santasiere contesting lines stemming from 1.e4 e5 2.Bc4 Nf6 3.d4. A great piece of chess history and theory. Play over the games from this "lost" event right on the web.
4-The Perreux Variation of the Two Knights Defense (arising after 4.Nf3 Nc6 5.Ng5) is one of the most forcing and least covered lines in the Two Knights, featuring exciting play with chances for both sides. This site also includes links to analysis and games in other lines of the Two Knights Defense.