  The evolution of a closed Friedmann universe filled by a tachyon scalar field
with a trigonometric potential and cold dark matter (CDM) is investigated. A
subset of the evolutions consistent to 1$\sigma $ confidence level with the
Union 2.1 supernova data set is identified. The evolutions of the tachyon field
are classified. Some of them evolve into a de Sitter attractor, while others
proceed through a pseudo-tachyonic regime into a sudden future singularity.
Critical evolutions leading to Big Brake singularities in the presence of CDM
are found and a new type of cosmological evolution characterized by singularity
avoidance in the pseudo-tachyon regime is presented.
