  Given a graph G, a colouring is an assignment of colours to the vertices of G
so that no two adjacent vertices are coloured the same. If all colour classes
have size at most t, then we call the colouring t-bounded, and the t-bounded
chromatic number of G, denoted by $\chi_t(G)$, is the minimum number of colours
in such a colouring. Every colouring of G is then $\alpha(G)$-bounded, where
$\alpha(G)$ denotes the size of a largest independent set.
  We study colourings of the random graph G(n, 1/2) and of the corresponding
uniform random graph G(n,m) with $m=\left \lfloor \frac 12 {n \choose 2} \right
\rfloor$. We show that $\chi_t(G(n,m))$ is maximally concentrated on at most
two explicit values for $t = \alpha(G(n,m))-2$. This behaviour stands in stark
contrast to that of the normal chromatic number, which was recently shown not
to be concentrated on any sequence of intervals of length $n^{1/2-o(1)}$.
Moreover, when $t = \alpha(G_{n, 1/2})-1$ and if the expected number of
independent sets of size $t$ is not too small, we determine an explicit
interval of length $n^{0.99}$ that contains $\chi_t(G_{n,1/2})$ with high
probability. Both results have profound consequences: the former is at the core
of the intriguing Zigzag Conjecture on the distribution of $\chi(G_{n, 1/2})$
and justifies one of its main hypotheses, while the latter is an important
ingredient in the proof of a non-concentration result for $\chi(G_{n,1/2})$
that is conjectured to be optimal.
  These two results are consequences of a more general statement. We consider a
class of colourings that we call tame, and provide tight bounds for the
probability of existence of such colourings via a delicate second moment
argument. We then apply those bounds to the two aforementioned cases. As a
further consequence of our main result, we prove two-point concentration of the
equitable chromatic number of G(n,m).
