I´d like to say that I am enjoying this thread a lot and by the way I am learning a lot of things about French politics, so thanks to the author. I am a little bit afraid about the Bleu Marine wave but otherwise I am expecting the predictions in the FN strongholds (Provence-Alpes Maritimes, Alsace-Lorraine, etc) and the possible triangulaires there. I will end loving Marineland (Hénin-Beaumont) and I am not too sure about a victory of Mélenchon over his Nemesis.
About the maps: pink-PS and red-front-the-gauche are fine to me, so I like big bad fab´s one (and the others too) but I think that a softer pink would work better in contrast (and DVG would need another colour).
Yes, 50+1 = first round victory.
And re triangulaires: I believe it's when more than two candidates get a minimum first-round share of registered (as opposed to voting) voters in a particular constituency (10%?), and one of them (more often than not an overachieving FN) refuses to step aside in the second round on behalf of the top/other two finishers...
If I am not wrong, the percentage of registered voters needed is 12.5% (1/8) to pass to the 2nd round.