Spoilers for Bank Holiday Monday 29 August 2022 (Series 86, Heat 51)

[Toby McDonald]

ADYTUM in R1

R3 Alt.: (75+4)*6+25 = 499
R6 Alt.: (9*8+7)*10+75 = 865
PRASKEEN as a R11 equaller, thanks to Paul Nixon on ZD.

Great game, Eliza was a very good player.

[L'oisleatch McGraw]

She had Octo potential.
Pity she came up against John.

[Howie Myers]

r5: UNDERTIES

[Philip A]

r5: UNDERTIES

Sorry, not a word.

[Howie Myers]

OTHER WORDS FROM TIE
re·tie, verb (used with object), re·tied, re·ty·ing.
un·der·tie, noun
un·der·tie, verb (used with object), un·der·tied, un·der·ty·ing.
well-tied, adjective

[Howie Myers]

r5: UNDERTIES

Sorry, not a word.

OTHER WORDS FROM TIE
re·tie, verb (used with object), re·tied, re·ty·ing.
un·der·tie, noun
un·der·tie, verb (used with object), un·der·tied, un·der·ty·ing.
well-tied, adjective

[Fiona T]

r5: UNDERTIES

Sorry, not a word.

OTHER WORDS FROM TIE
re·tie, verb (used with object), re·tied, re·ty·ing.
un·der·tie, noun
un·der·tie, verb (used with object), un·der·tied, un·der·ty·ing.
well-tied, adjective

Unfortunately with the demise of lexico, there's no easy way to check words without a subscription.

A workaround is here

https://developer.oxforddictionaries.com/

If you scroll down you can "test the api" which will give you a definition if the word is valid (undertie assumes you meant underlie)

[Gavin Chipper]

Sorry, not a word.

OTHER WORDS FROM TIE
re·tie, verb (used with object), re·tied, re·ty·ing.
un·der·tie, noun
un·der·tie, verb (used with object), un·der·tied, un·der·ty·ing.
well-tied, adjective

Unfortunately with the demise of lexico, there's no easy way to check words without a subscription.

A workaround is here

https://developer.oxforddictionaries.com/

If you scroll down you can "test the api" which will give you a definition if the word is valid (undertie assumes you meant underlie)

I was just doing the very same thing!

[Philip A]

r5: UNDERTIES

Sorry, not a word.

OTHER WORDS FROM TIE
re·tie, verb (used with object), re·tied, re·ty·ing.
un·der·tie, noun
un·der·tie, verb (used with object), un·der·tied, un·der·ty·ing.
well-tied, adjective

Not sure where you got this from, but I think you have the wrong dictionary. Countdown’s dictionary is Oxford Dictionaries Premium, which Apterous’s dictionary is an accurate facsimile of, and undertie is not in there.