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Topic: HELP with a Gilbreath set-up
Message: Posted by: Papa Legba (Oct 13, 2021 10:06AM)
Afetr the usual mixing, cutting the deck in half, turning one half then riffel shuffling, the cards end up mixed, some face-up some face down. Cards are picked off two at a time those that match (both face up or both face down are set aside. Those pairs comprising one face up and one face down are found to match in colour.

Can't figure out the initial set-uo, any help please?
Message: Posted by: JanForster (Oct 14, 2021 04:45AM)
If I understand you right, a mirror stack should do, here: from top down 13 red, 26 black and then 13 red cards e. g. ... Jan
Message: Posted by: Papa Legba (Oct 14, 2021 07:02AM)
Thx Jan, I will experiment with this.
Message: Posted by: Loz (Oct 15, 2021 04:34AM)
If you have a fully alternating red-black deck, turn one half over and shuffle face up into face down with a standard riffle shuffle. Cut one card from top to bottom and you're set: all face-up/face-down pairs will be the same colour. pairs of face-up or pairs of face-down will not.

Hope that helps.

Message: Posted by: Papa Legba (Oct 16, 2021 05:14PM)
Thank you Loz.