[Retros] Solidarity Chess (=SC)

[Nicolas Dupont]

> It is worth considering that your fairy condition might simply redefine the

> nature of check.

>

> This is done, for example, in the Extinction Chess, and Anti-Kings

> conditions.


And for plenty of other conditions: SAT (already mentionned) or e.g.  
Vogtlaender chess. In this latter, a checking move gives the  
opportunity to the opponent side to capture your own King. For  
example, with wKe1, bPc2e2, we have Kf1+ and Kd1#. After 1.Kf1+, the  
only legal black answers are 1... e1=S and 1... e1=B.