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Roller is a kind of random mover. It plays as many random games (to mate/draw) as it can in the time interval and selects the root moves with the most points. Very weak but it can usually thwart and give mate in one.

https://github.com/op12no2/roller

By far the most hit page on my website was the mate-in-1 trainer. So just a note to say that (along with Lozza itself) the trainer has moved to here:-

https://op12no2.github.io/lozza-ui

Sources here:-

https://github.com/op12no2/lozza
https://github.com/op12no2/lozza-ui

Hi all, Apologies if i'm late to the party but just wanted to note how awesome github pages are if you are a javascript developer. Because as well as hosting your code in a repo, the pages component of the repo can host an associated static website, which of course implies the app itself for javascr...

@Roller: Oh, I was still there, but only saw the NEG-Roller game and your message after you left. NEG has no search; it counts attackers and defenders of each square, and uses a simple heuristic to give a value of the capture to that square (assuming you gain the full value of the victim if it is u...

Regarding strength: would it make any sense to increase the weights (i.e. the frequency of being selected randomly) of all captures, promotions and possibly also checks during a rollout? I have never tried MCTS myself but I could imagine that this might increase the probability of actually losing a...

hgm wrote: ↑

Sat Oct 13, 2018 6:14 pm

But limiting it to LxH and equal captures could be a good idea.

Can't do that as that it's semantic knowledge

Sven wrote: ↑

Sat Oct 13, 2018 5:29 pm

Nice work, Colin!

I found one very minor issue: when checkmating by promoting, the display does not change the pawn into the promotion piece.

Thanks Sven and good catch! I suspect that bug is in the Lozza UI as well. I'll fix it.

Hi hgm, Could I have a login for Roller please. colin@sailwave.com Roller is a lot of fun and I created it for my niece who is just learning the game. I tried weakening Lozza in various ways but didn't like the results. Roller is Javascript and what wikipedia calls a "pure mcts algorithm": from the ...

hgm wrote: ↑

Sun Jul 29, 2018 8:17 am

p19: 'tell 49 Lozza vs. Nemeton a game in tourney #1 just ended. Lozza checkmated 0-1'
p3: 'tell 49 Nemeton vs. Lozza a game in tourney #1 just ended. Lozza checkmated 1-0'

Let me know if I need to tweak Lozza's output. But AFAIK it has not changed since previous events.

Dann Corbit wrote: ↑

Thu May 10, 2018 6:53 pm

Grouped by 4, each position (of the 4) should have identical evaluation. If not, then there is an evaluation bug.

Found 2 bugs just now, trying that!