Queen-Killer is a precise distillation of the PBTA system, with prompting and moves that hone its focus into a finely whetted point.

Truly clever design frameworks often leave little room for excess. Nothing intemperate; nothing gratuitous; every element of the system reinforces the game's core intent. Queen-Killer is that rare gem which not only promises elegance, but delivers on that promise in roughly an hour or less — a hard deal to beat.