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Hola:
Fue el año 1941, en medio de la campaña Alemana llamada “Operación Barbarroja” lanzada por Hitler contra Russia. Stalin y 3 de sus generales más fiables estaban a bordo del tren especial del Mandatario Ruso con rumbo a un lugar secreto. El tren entró un largo túnel viejo.
De súbito, los pasajeros se hallaron envueltos en plena oscuridad por casi un minuto. Cuando el tren emergió al final del túnel, Stalin notó que a sus tres generales les habían manchado la mejilla. Por lo visto, los tres estaban inconcientes de esto. Stalin vió en la sutuación una excelente oportunidad para poner a prueba la astucia de sus Generales favoritos. Lo hizo de esta manera: Les mandó llamar en su despacho y les dijó:
Dos de Uds. tienen su mejilla manchada de hollín a causa del tren a su paso por el túnel. Ahora, quiero que se miren bien unos a otros. Si está absolutamante seguro de que Ud. es uno de los dos que tiene mancha en la cara, levante su mano !

Los tres se miraron fijamente. General Chuikov no levantó su mano. General Malenkov tampoco levantó la suya. Sólo General Zhukov lo hizo! Entonces Stalin le dijo al General Zhukov,
— Comrade General, está Ud. realmente seguro de que le tiene manchada la cara?
— No tengo la más minima duda de eso, Comrade Stalin! — replicó el Gen. Zhukov.
— Y ¿qué le hizo estar tan seguro?— Stalin quiso saber.

Pregunta: Sí, ¿Por que estaba tan seguro General Zhukov de que le tenía la cara manchada a diferencia de los Generales Chuikov y Malenkov?

[H]M

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En otras palabras —
The year was 1941, at the height of the German campaign code-named “Operation Barbarosa” unleashed by Hitler on Russia. Stalin and his 3 most trusted generals were on board the Russian leader’s special train en route to a secret place. The train entered an old and long tunnel. The passengers suddenly found themselves enveloped in complete darkness for about a minute. When the train exited out of the other end of the tunnel, Stalin noticed that all of his three generals had soot smear on their face. Apparently the generals were unaware of it. Stalin saw in the situation an excellent opportunity to put to a test the mental acuity of his favorite generals.
This is how he did it: He sent for them at his coach and told them,
Two of you had your face smeared with soot on account of the train’s passing through the tunnel. Now, I want you to face one another. If you are absolutely sure that you are one of the two with smear on his face, raise your hand !
The three generals turned and faced one another fixedly. General Chuikov did not raise his hand. General Malenkov did not raise his hand either. Only General Zhukov did so. Then Stalin said to Gen. Zhukov,
— Comrade General, are you realy quite sure you have smear on your face?
— I have not the least doubt about it, Comrade Stalin, — replied Gen. Zhukov.
— And what made you so sure, comrade General? — Stalin wanted to know.

Q: — Yes, what made Gen. Zhukov so sure that he had soot smear on his face unlike Generals Chuikov and Malemkov?
Comments  
Halo:

This answer maybe a long shot, but just the same, here it is:

All the 3 generals had soot on their faces, but Stalin told them that only two of them had it. This gave the gnerals to understand that one of them had a clean face. Gen. Chuikov did not raise his hand thinking that he was the one with a clean face because he saw both .Generals Zhukov anf Malenkove with smeared faces. This was also true for Gen. Malenkov, who also did not raise his hand thinking that he was the one who was clean upon seeing both Gens. Zhuikov and Chuikov with soot on their faces. General Zhukov, on the other hand quickly raised his hand on seeing that the two generals did not raise their hand. This was how he reasoned: Gen. Chuikov did not raise his hand because he saw him (Zhukov) and Gen. Malenkov with smeared faces. Gen. Malenkov likewise did not raise his hand when he saw him (Zhukov) and Gen. Chuikov with soot on their faces. This clearly means therefore that both Gens. Chuikov and Malenkov saw him (Zhukov) with soot on his face.

Saludos. I hope I got it right.
¡Muy bien, muy bien. [Y]!

Te felicito, Nimo. Y gracias por tu interes en el post!

[H]M