Sentence: If black is already counting his chickens...

[Infin1ty]

Could anyone please tell me what the sentence below means? Thanks. :)

If black is already counting his chickens, please be so unkind and interrupt him.
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[Skrej]

It's a reference to the idiom "Don't count your chickens before they hatch", which means to not make plans on expected results, until you have seen the actual results.

The speaker is sarcastically telling another person that they should interrupt black's counting (of chickens that haven't hatched) if he's already begun.

<edit> In light of the new context, I concur with Gray's explanation.
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[Gray]

'Counting the chickens' means assuming that everything is going your way. The sentence here is mentioned in the context of a game (goproblems). Black is the colour of the balls.

So, if your opponent is assuming that heshe is going to win, be unkind and and interrupt himher -- make a wise move and win the game.

Also, refer -- Don't count your chickens before they are hatched
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First lesson - English, not english. I, not i. ~A student of English

[Infin1ty]

Thank you very much, Skrej and Gray.
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Please feel free to correct me if you find any mistakes in my posts.