There is no reachable chess position with more than 218 moves.

Very interesting post, thank you!

A "layman's" question I have after reading is: If your code "swims" through solution space to find a maximum, how can you be sure that it isn't just a local maximum instead of the global one you're searching for?

Very interesting post, thank you! A "layman's" question I have after reading is: If your code "swims" through solution space to find a maximum, how can you be sure that it isn't just a local maximum instead of the global one you're searching for?

Tobs40

#42

@JimGon said in #39:

In the first position what was Blacks last move.

White Queen gives check, black pawn goes from b3 to b2 to block the check. Now it's White's turn and White has 218 moves to choose from.

@JimGon said in #39: > In the first position what was Blacks last move. White Queen gives check, black pawn goes from b3 to b2 to block the check. Now it's White's turn and White has 218 moves to choose from.

Tobs40

#43

@nocturn9x said in #40:

I can finally be at ease with this line of code in my engine: const MAX_MOVES* = 218

Thanks! :)

Haha, love that!

@nocturn9x said in #40: > I can finally be at ease with this line of code in my engine: const MAX_MOVES* = 218 > > Thanks! :) Haha, love that!

#44

FInLIp

#45

You seem to like programming and you seem to like mathematics more than chess. That is just like me. But the problem in my case is that I am good at none of the three. Maybe I am better at running.

sugarhibiscus

#46

beautiful blog love the hard work except BLUE is the color for math sorry

alphabert0625

#47

@sugarhibiscus said in #46:

beautiful blog love the hard work except BLUE is the color for math sorry
Same

@sugarhibiscus said in #46: > beautiful blog love the hard work except BLUE is the color for math sorry Same

great study

@RabbitsGrowOnTrees said in #30:

@krovsky The positions all seem reachable to me, why don't you think they are?

Wow, so a board position with 17 white queens and 2 white kings seems to you reachable somehow? And the next picture with 60 pieces on board as well?

@RabbitsGrowOnTrees said in #30: > @krovsky The positions all seem reachable to me, why don't you think they are? Wow, so a board position with 17 white queens and 2 white kings seems to you reachable somehow? And the next picture with 60 pieces on board as well?

CM RabbitsGrowOnTrees edited

#50

@kroksy said in #49:

Wow, so a board position with 17 white queens and 2 white kings seems to you reachable somehow? And the next picture with 60 pieces on board as well?

Your comment stated "with all those pictures" not just the first 2 and hence I thought you were referring to the final solutions:

https://lichess.org/study/PLtuv3v5

It's stated in the article that the first two positions shown are not the final reachable solutions and were failed attempts along the way.

@kroksy said in #49: > Wow, so a board position with 17 white queens and 2 white kings seems to you reachable somehow? And the next picture with 60 pieces on board as well? Your comment stated "with all those pictures" not just the first 2 and hence I thought you were referring to the final solutions: https://lichess.org/study/PLtuv3v5 It's stated in the article that the first two positions shown are not the final reachable solutions and were failed attempts along the way.