When i decided to get back to digging Jim Ablett's oldest builds, still hosted in Kyrill Kurikov's repository, i had very little hope of discovering anything unseen before. Well, a long time ago i'd navigated very deep all these folders and i should have collected anything available already.
But you never know. The hunt for the hidden treasures didn't yield a null result: 3 old builds to try should be better than nothing.
Out of three new engines found there, only one seemed to bu usable so far: Apil Chess 1.06. Two others, Cyrano and Sissa (another build was tested years ago without success) have failed to play engine games despite my efforts. They can be imported and seem to work but they exit suddenly during all games.
Regarding Apil Chess, it can barely play games but most of them require "post adjudications" due to frequent terminations before checkmate.
In fact, below description of the engine is highly attractive at Chessprogramming Wiki:
"APIL chess (Asynchronous Process Interaction Library chess) is an open source distributed chess program for educational purposes and private use written by Ulf Lorenz and first published in July 2002. APILchess represents the board using a 16x12 mailbox array with 16-bit disjoint piece flag encoding, and piece-lists. There are traces (Hydra.h), that the Asynchronous Process Interaction Library was already used for early Hydra trials."
Reading Hydra between the lines made me excited too. However, the Android build can't play like Hydra, the cluster-monster engine which had beaten GM Michael Adams (ELO 2740) decisively in the last human vs machine match played at tournament time controls without odds.
Windows build of the v1.05r1b is not different: Only 1464 ELO in CCRL 40/4.
After some 20 games vs Chess for Android native engine and Zzzzz, the Android build seems to play around 1400 ELO so far at shorter time controls.
I can't yet dare to introduce Apil into Rapidroid because of the adjudications which will probably bother me very much. We'll see.
For those who enjoy beating computers at chess, Apil 0.6 can be downloaded: HERE