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Torom / BotLi

Lichess Bot
GNU Affero General Public License v3.0
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Question #120

Closed EmptikBest closed 1 year ago

EmptikBest commented 1 year ago

Hello, I was wondering the priority of opening books in BotLi. For example you have 2 opening books, one with 1.e4 weight as 75, and the other with 1.d4 weight as 75... Which one will be prioritized first? Is it like vertically descending, the first book you mention gets priority, or what? Thanks in advance

Torom commented 1 year ago

Yes, if the first book contains a move, it will be used, regardless of the weight if it has a non-zero weight. Only when a book no longer contains a move the next book is looked at.

The weight from different books is not compared because I do not assume that weights between different books are comparable.

I have been thinking for a while if an option where the books are used in random order would be useful. Feel free to tell me what you think about it.

EmptikBest commented 1 year ago

Okay, I think that it should be sequential only, as I have around 50 books, and now as you have confirmed I can sort them in priority, and with that, tune them too... Thanks.. Also, just another question, if all the weights in the first book are 0, then is a random move selected from it or is the next book used, which has non-zero weights?

Torom commented 1 year ago

I have to correct myself. A move from the first book is played if one of the moves has a non-zero weight. Moves with a weight of zero are generally ignored. So if there are only moves with a weight of zero, the next book is checked.

How moves with the same weight are handled depends on which selection you have configured. With best_move the move that is first in the book is played. With weighted_random surprisingly a weighted random move is played.

EmptikBest commented 1 year ago

But if two moves dont have the same weight in a book (ex 1.e4 75 and 1.d4 25) with best move is e4 played even if d4 is first (By first mean like higher in the list of moves when opened with SCID vs PC)

Torom commented 1 year ago

What selection are you talking about?

The order of the moves in the book is only considered in the selection 'best_move' if several moves have the highest weight. Then the move that is higher up is played.

EmptikBest commented 1 year ago

Oh okay, thanks