I've brewed quite a few Pilsners, Helles, and Festbiers over the last 2 years and have used a variety of yeasts; 34/70-WLP830-WY2124, WLP838, a blend of WLP830 & WLP838, WY2206, WY2308, and WLP835.
I was reading through past threads in this forum to learn about other's preferences for Czech / Bo Pils yeasts and came across S. Cerevisiae's multiple posts about Saaz-type vs Frohberg-type lager yeast strains. From one of those posts:
Bavarian and Bohemian S. pastorianus yeast strains are very different genetically. Bavarian strains belong to the Frohberg family. Bohemian and Danish yeast strains belong to the Saaz family (Carlsberg Bottom Yeast No. 1 is a Saaz strain). The Frohberg strains are tetraploids (4n) with two sets of S. cerevisiae chromosomes and two sets of S. eubayanus chromosomes. Saaz strains are triploids (3n) with one set of S. cerevisiae chromosomes and two sets of S. eubayanus chromosomes. Saaz strains are more cold tolerant than Frohberg strains because cold tolerance is inherited from S. eubayanus, and Saaz strains are 2/3rds S. eubayanus genetically.
I would go with a Saaz-type (Bohemian) yeast strain such as 2000, 2001, or 2278. Wyeast 2124 is Weihenstephan W-34/70, which is a Frohberg-type (Bavarian) yeast strain.
So for my next Bo Pils batch I would love to use a Saaz-type yeast strain but they seem a bit tougher to acquire with 2000 and 2001 as Wyeast Private Collection yeasts and then finding mixed reviews on this forum of the more readily available WY2278. May be able to find some WLP800 (WY2001 equivalent?).
I did a bit of unsuccessful Googling to find out more about Saaz-type strains so I'm wondering if anyone knows if any of the following are Saaz-type strains?
WLP802, WY2002, and WY2782
It's an interesting topic regardless, would love to hear more if anyone has more information.