Ruy Lopez, Exchange Variation grandmaster play by Emanuel Lasker, and later invigorated with new ideas by Bobby Fischer. The Exchange Variation can be a powerful psychological weapon. Black is forced to play actively, which is psychologically difficult if all one needs is a draw. Lasker's famous win against Jose Raul Capablanca in the St. Petersburg 1914 chess tournament is an example of this. With a lead in the tournament, Capablanca was intent on simplifying the game to obtain a draw, but faced with the Exchange Ruy he played too passively and was routed by Lasker as a result. 4...dxc6 is the main recapture. Black's
Tactical decision game fictional. If the scenario is based entirely upon a reliable historical narrative, a tactical decision game is also a "decision-forcing case". (Such an exercise may also be called an "historical map problem".) However, if any of the elements in the scenario of a tactical decision game is fictional, then the exercise is a kind of "fictional decision game". In Chapter 14 of "The Prince", Niccolò Machiavelli tells the story of the Greek general Philopoemon, who made extensive use of tactical decision games. “Philopoemon, Prince of the Achaeans, among other praises which writers have bestowed on him, is commended because in