Hopefully I’ve got the right puzzle this time. Let’s check… 1027. Yes. Good.
Many apologies for posting the wrong one earlier.
Shark’s ‘Checkmate’ has extra letters and highlighting galore, which I’d like. I’d also like it if ‘Checkmate’ was a reference to the Wu-Tang Clan (warning: link contains rap music), but I doubt it will be. (It’s not.)