Boavista could often win on yellow cards whenever playing against Estoril. So I think this bet is quite reasonable; on average, Boavista may receive 2 yellow cards per match.
It seems Ajax have pulled themselves together and can now even overcome Twente, who previously played three consecutive matches to draws. If they try not to lose here as well, Ajax will most likely not allow it; I think Ajax will prove stronger.
If Nacional are losing in this match or the team fails to make the game even, I can assume that the team will start playing roughly, and previous matches have shown that getting 2-3 yellow cards in a match is no problem for them.
Al Wehda will not be able to contain themselves in this match; the head-to-head record clearly shows that they are quite capable of receiving three yellow cards against Al-Nassr in a match. Al-Nassr will press in this match.
Although Anorthosis had the advantage in their head-to-head matches, judging by their previous games this season, the team may find this match quite difficult. They can both score and concede, so BTTS is a realistic option here.
Apollon will be able to take the initiative in this match. Karmiotissa are poor defensively. Most likely, in this match they will only concede and will not be able to score either; they simply will not be allowed to do so here.
Al-Fateh have started committing a lot of fouls away from home; in this match, they could get at least a couple of yellow cards. Al-Taawoun have started playing better at home, and in their head-to-head matches they were able to put pressure on the visitors’ defense.