This build of CorChess is bundled with Other (Stockfish) Engines app by Javier. In case you want to install it directly under your favorite GUI without using OEX functionality, you can use THIS binary prepared for arm7 pie devices.
Corchess is a tweaked Stockfish version in order to handle longer time controls more efficiently. Try and see whether the target is hit!
In case of trouble downloading from your PC, use your mobile device or refer to THIS POST.