[thorvald]

I have noticed, that even though it is often stated that the bots don't signal, it looks to me, that some signalling occur.

Perhaps it is just the randomness of the discards, that makes me remember, when it match the actual holding, and just not notice, when it doesn't match

But let us look at an example from yesterdays Challenge - this is NOT the advanced bots

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You quickly bid to 6♠, and the West bot lead ♥J to the King (♥8 from East)

This is a fine slam, as all you need is to find where ♣A is located, and Mortons fork Coup is present (https://www.bridgebu...s_fork_coup.php)

Normally I would expect East to hold ♣A more than 50% of the time as West might have lead it, but I am not sure about the bots leading principles

Now all followed to two rounds of ♠, and you have arrived at the decision point.

Is the ♣A at east or West?

Well, just playing it like normal bridge, I cashed one more round of trump (ending in dummy), to see some discards, and West threw ♣3 and East♣9.

So did that change anything?

Now, we players might assume that a high card is encouraging, but as bots don't intentionally signal it is probably not the case, but still it signals something to us, as the bots often drops the highest card it can afford.

♠ is 2-2
♦ is probably 4-4 as no ♦-discards

So clubs seems to be 4-4 or 5-3, but assuming 4-4 based on the discards, it seems both opponents are 2344

Have you made up your mind?

Spoiler

I just played East for the Ace and made my contract, and noted it looked like East was encouraging.

What is interesting is a full simulation whit all 4-4 combinations, to see if the discards could be used to find the Ace, not because the bots signal intentionally, but because they have the rule of discarding highest possible card