Looking at this code without further knowledge of the strategy function, my first guess is simply that your strategy function may not be returning a result which satisfies the valid-move? and legal-move? predicates thus throwing you into an infinite loop. Possibly the printf is being suppressed within the swap! operation, but some testing would be required to see if this is the case generally. The other obvious potential for a hiccup would be if all-directions is somehow growing with each iteration of make-move, thus preventing idx from ever exceeding its length. Not knowing what is going on inside all these functions makes this a rather tricky bit of guess work at best. Anyway, I'd try running get-move from the repl to see how likely it is to get stuck in an infinite loop.
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