It seems more like 1D chess. Going by his letter to Slater and Harvie, Yousaf thought that this would all be very business-like, that the Greens would understand that he was acting prior to their membership ending the Bute House Agreement anyway and that they could move back to relying on them helping an SNP minority government. Instead, the Greens have blown up, Lorna Slater accusing the SNP of a culture war and backing down to the most reactionary people in the country (SNP backbenchers?), Patrick Harvie retweeting statements saying that the SNP have sold out to big donor money (don't think the SNP have many big donors, maybe Harvie means Mr Soutar).
I posted earlier in this thread, in true Nostradamus style, that the Bute House Agreement was popular with SNP activists. The only polling I ever saw about it was positive but in the last couple of days the whole thing has crumbled, it all seems to have been built on sand. I doubt there will be any alliance between the SNP and the Greens again unless there's a big push back. What was the trigger for all of this? The climate targets?