Errors in move validation?

[ganthern]

I'm not sure if I simply misunderstood the rules, but this move:

seems to break the "contribute to one connected row or column" rule.

[mkeeter]

You discovered the secret, forbidden technique: the validation layer only checks that moves share a row/column and that the resulting board is valid; it does not check whether the placed pieces are actually all connected.

This is fixed in the commit above, and I'll deploy a server change shortly.