Mannheim 1914 chess tournament
The 19th DSB Congress (19. Kongreß des Deutschen Schachbundes), comprising several tournaments, began on
20 July 1914 in Mannheim. Germany declared war on Russia (on August 1) and on France (August 3), Britain joining in the next day. The congress was stopped on 1 August 1914. 

The tournament took place in the "Ballhaus", a building situated in the Mannheim Palace garden area.

The following participants played in the Masters tournament (Meisterturnier):
from the Austro-Hungarian Empire: Gyula Breyer (Hungary), Oldřich Duras (Bohemia), Richard Réti (Slovakia), Rudolf Spielmann (Austria), Savielly Tartakower (Poland), and Milan Vidmar (Slovenia)
from the Russian Empire: Alexander Aljechin (Russia), Efim Bogoljubov (Ukraine), and Alexander Flamberg (Poland)
from France: Dawid Janowski (France)
from the German Empire: Siegbert Tarrasch (Nürnberg), Walther John (Breslau), Paul Krüger (Hamburg), Carl Carls (Bremen), Ehrhardt Post (Berlin), and Jacques Mieses (Leipzig)
from Switzerland: Hans Fahrni (Switzerland)
from the United States: Frank James Marshall (USA).

Alexander Alekhine was leading the Meisterturnier, with nine wins, one draw and one loss, when World War I broke out. German organizers of the tournament decided that the players should be "indemnified" according to their score, but not paid the total prize money. Thus Alekhine got 1100 marks, Vidmar 850, Spielmann 600, Breyer, Marshall and Reti 375 each, Janowski 250, Bogoljubov and Tarrasch 180 marks, and all the others 100 marks. Calculated in terms of purchasing power today, the sums would be multiplied ten times in euros. So Alekhine's "consolation prize" was 11,000 Euros.

Meisterturnier

Hauptturnier A
The following participants played in the Main tournament (Hauptturnier A):
from the Austro-Hungarian Empire: Lajos Asztalos (Hungary) and Karel Opočenský (Bohemia)
from the Russian Empire: Fedor Bogatyrchuk (Ukraine), Boris Maljutin, Ilya Rabinovich, and Alexey Selezniev, all from Russia
from the German Empire: Carl Ahues, Wilhelm Hilse, Oscar Tenner, Wilhelm Schönmann, and B. Studt (Germany)
from Switzerland: Hans Duhm (Germany), Walter Henneberger (Switzerland)
from Netherlands: Willem Schelfhout (Netherlands)
from Australia: Gunnar Gundersen (Norway)
from Romania: Sigmund Herland (Romania)
from the Ottoman Empire: B. Hallegua (Turkey).

Hauptturnier B

The Hauptturnier B started with five preliminary groups of 10 players each. The two winner groups comprised 9 players each and completed their nine rounds respectively.

The first winner group was won by Julius Brach (Brno, Moravia), 6 (out of 8) points, ahead of Peter Yurdansky and Peter Romanovsky (both from Russia) and František Schubert (Mlada Boleslav, Bohemia), 5 points each. The following players were G.J. van Gelder (4½) (Netherlands), and C. Thönes (3½) (Germany), Salomon Szapiro (Lodz, Poland), H. Thelen (3 each) and P. Müller (1) (both from Germany).

The second winner group was won by Nikoly Rudnev (Kharkov, Ukraine), 7 (out of 8) points, followed by Józef Dominik (Cracow, Poland, 6), Max Lange (Berlin, Germany), 5) − not related to Max Lange −, Asch (4½) (Austria), M. Gargulak (Husovice near Brno, Moravia), and Heinrich Wagner (both 4), A.N. Hallgarten (3), K. Pahl (2) (all from Germany), and Anton Olson (½) (Sweden).

Plans for an International Chess Federation
During the tournament, a group of Russian and German masters, including Peter Petrovich Saburov and World Champion Emanuel Lasker, who did not enter the tournament itself, followed an initiative from the Saint Petersburg 1914 tournament and made concrete plans for an International Chess Federation (see also FIDE).

Outbreak of war and internees
The next DSB congresses, it was decided, were scheduled for Bad Oeynhausen (1916) and Munich (1918). But history took a different turn. The political situation became more and more tense while the tournament went on. Milan Vidmar, in his autobiography Goldene Schachzeiten, gives a fine report about the melancholic mood of the masters participating in the unfinished Mannheim "chess symphony". Soldiers of the German army began to dominate the city panorama. When Germany put first an ultimatum (July 31) and then declared war the following day against Russia, the tournament had to be interrupted. 

After the declaration of war, eleven "Russian" players (Alekhine, Bogoljubov, Bogatyrchuk, Flamberg, Koppelman, Maljutin, Rabinovich, Romanovsky, Saburov, Selezniev, Weinstein) were interned in Rastatt, Germany. On September 14, 17, and 29, 1914, four of them (Alekhine, Bogatyrchuk, Saburov, and Koppelman) were freed and allowed to return home via Switzerland. A fifth player, Romanovsky was freed and went back to Petrograd in 1915, and a sixth one, Flamberg was allowed to return to Warsaw in 1916. Whilst imprisoned, some participated in the Triberg chess tournament.

Ukrainian master Efim Bogoljubov, stayed in Triberg im Schwarzwald, married a local woman and spent the rest of his life in Germany (settled permanently since 1926).

Frenchman Dawid Janowski, born in the Russian Empire, as well as Alekhine, was interned but released to Switzerland after a short internment. Then he moved to the United States.

The American Frank James Marshall, being from a neutral country, was allowed to leave. It took him five days to travel to London, and he left almost at once for New York City. In his My Fifty Years of Chess Marshall wrote: "I made for the Dutch border and arrived in Amsterdam after many adventures. Usually a seven-hour trip, it took me 39 hours.
Somewhere on the border I lost my baggage, containing all my
belongings and the presents I received in St. Petersburg and
elsewhere...Five years later, much to my astonishment, my trunks
arrived in New York, with their contents intact!"