Ragozin — Tsvetkov

Chigorin MemorialMoscow, 1947

• Viacheslav Ragozin (1908–1962)Soviet grandmaster, World Correspondence Champion, and Botvinnik's long-time training partner; a well-known defence to the Queen's Gambit carries his name.
• Aleksandar Tsvetkov (1914–1990)Bulgaria's strongest player of the late 1940s, a multiple national champion and the first Bulgarian to earn the international master title.

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1. 14.
2. A typical method against hanging pawns. Black cannot defend the c5 pawn with another pawn, and so loses control of the central d4 square. This turned out to be decisive
3. 14.
4. AfterWhite's pieces would take up excellent attacking positions
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10. 20.
11. White has gained a clear positional advantage, taking the c-file and the d4 square. Black is left with an isolated pawn in the center, which becomes a weakness in the endgame

Undermining hanging pawns paid off. But of course, this tactic is not worth playing when the side with the hanging pawns gets a strong passed pawn out of it.