Ethereal is an engine under regular development progress by Andrew Grant. According to its author, who hopefully started to compile for Android too starting from this release, Ethereal is capable of beating MicroMax and TSCP, which means it may reach 2000 ELO in Rapidroid.
Below remarks are taken from the author's description:
"Ethereal is a UCI compliant chess engine which uses a BitBoard board representation and an alpha beta pruning framework. Additionally, the engine uses the follow improvements to pruning, move ordering, and other time saving methods; Null move pruning, Razoring at pre-frontier and frontier nodes, Delta pruning in the quiescence search, Late move reductions in the main alpha beta algorithm, Null windows for principle variation searches, a transposition table, and finally, a killer move heuristic. This engine was originally developed to give myself a worthy opponent, but has since become a worthy opponent for other chess engines. This engine can compete with various engines in the lower rankings of the CCLR tier lists. Some of those results are noted at the bottom of this readme."
I'm planning to test Ethereal as soon as possible and add it to the ranking in next release, in case it works without problems.
Download Ethereal arm5 for Android: HERE