Antichess AI now on lichess

#28 Also possible is that someone sufficiently motivated writes a program to play openings on Stockfish's behalf... I once tried and failed.

Thanks Toadofsky and others. The engine is super-strong :)
I really enjoyed the games

wow, townes, you beat the stockfish engine with h3?!
koooolllll....!!

yayy!!! thank u all soo much!!!! ^_^

its sooo coool

I wonder if the latest version of the engine is currently used on lichess (I mean the code committed on Nov 19) or it is updated not so often?

@tolius You can see the latest release on github.com/niklasf/Stockfish/releases.

@ubdip thanks, it means that the latest changes in piece values have not yet been employed. I especially like the increase in the value for the rook in endgame (before that, it looked too small compared with other pieces). But I have no idea how you define such precise consts, looks like magic)) Maybe you use multiple runs (tests) Engine vs Engine with different constants and then select the best?

@tolius The values are tuned automatically in selfplay using my fork (github.com/ianfab/spsa) of the SPSA tuner for official Stockfish. The version with the resulting parameter changes of the tuning is then tested against the current version to verify that it actually improves playing strength, since tuning can get stuck in local optimums and does not always return the best values.

The tuning session for antichess piece values actually is still running and the endgame rook value is still increasing, but I have already commited some intermediate results that already yielded an improvement.

I had already tuned the values some time ago, but due to other changes in the evaluation function the optimal values can change.

@ubdip oh, thanks, I see