I won fairly easily. The engine is quite weak, it falls for basic tactics (is it custom made?). But, obviously, I assume that's not the point... it's just fun to play :) For a chess player it feels kind of like 2048. Plus, I guess, good exercise for some endgame training.
No I didn't try with six pieces. :-) Thanks for the like. I am working on a two player version that connects random people to play against each other for the next version.
* Do X crunches every 2 or 3 moves.
* Do X pushups/pullups/situps/skipping/etc every 2 or 3 moves.
Disclaimer: I am also creator or a chess variation halfchess.com