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Solid black feathers on the chest, dark red patches on the shoulder/wing area, and long, thin, pointed back feathers are all good indicators of cockerels.

The first one is iffy. Could be a late maturing cockerel, might be a pullet. The last picture shows two cockerels for sure.

That's part of the risk with hatching eggs.

That one also looks like a cockerel, with the patchy dark red on the wings/shoulders.

At that age, with pink combs already, both are male.