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Did he include under-promotion captures resulting in zugzwang? If you’re not including zugzwang then you shouldn’t include checks and mates. The problem becomes
by CalChris 2y ago
Did he include under-promotion captures resulting in zugzwang? If you’re not including zugzwang then you shouldn’t include checks and mates. The problem becomes a lot simpler.
- yunwal 2y agoZugzwang has no notation. The author states in the first 2 minutes or so that the video is about the rarest edge cases in notation.
- CalChris 2y agoNf3 can be ambiguous but resolved by the position itself. That ambiguity has no notation either. FWIW, I wrote the XBoard PGN parser.
- yunwal 2y agoRight, the video talks about that and doesn’t consider the ambiguous but resolved by position one different from any other Nf3
- mathgradthrow 2y agoparent is referring to stalemate. Underpromotion to a bishop to achieve stalemate was my guess for rarest, since you can always stalemate with a queen just as well as a bishop, so theres no reason to underpromote if you goal is a draw on the turn in which the promotion occurs.
- yunwal 2y agoStalemate doesn’t have notation either, so the OP doesn’t consider it different than any old bishop underpromotion