Ignore the advice to “bid the number of spades in your hand,” a blunt instrument that won’t get you very far against real cash money spades players.
http://mirosovak.edoras.cz/viewtopic.php?f=3&t=490192
https://talkingpoints.org/subx/showthread.php?tid=88929
https://www.ww2.site/forum/viewtopic.php?t=75046
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https://boards.streamweaver.app/showthread.php?tid=24502
https://www.ww2.site/forum/viewtopic.php?t=372945
http://tv-online.simple-otr-mirror-alternative.de/phpBB3/viewtopic.php?f=37&t=9646
http://www.lada-xray.net/showthread.php?p=255459#post255459
https://wietmarkt.nl/viewtopic.php?t=600242
http://bbs.xixiku.cloudns.ph/bbs/forum.php?mod=viewthread&tid=33441&extra=
http://myweed.rocks/viewtopic.php?t=36689
http://1.s.2.free.fr/viewtopic.php?f=18&t=290662
http://forum.animogen.com/viewtopic.php?f=76&t=1587865