[rhm]

I think I have seen this hand in a book (Kelsey?) somewhere, certainly the theme.

Rainer Herrmann

[nige1]

Another old chestnut with a similar theme.
Against South's 4♠.
West leads ♣Q ruffed by East.
Plan the play.

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[rhm]

I now know where I have seen this theme before at least once:

Bridge Master, black series board 23:

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West leads the diamond king and East turns up with 4 diamonds to the queen and ten.
At trick 5 East will switch to the club jack to which West shows out

Rainer Herrmann

[Cyberyeti]

nige1, on 2018-January-21, 08:00, said:

Another old chestnut with a similar theme.
Against South's 4♠.
West leads ♣Q ruffed by East.
Plan the play.

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This is the one where you unblock the K and A of clubs at trick 1, draw trumps, cash A♦ exit on clubs, take a double discard on the clubs, then a ruff and discard then cross ruff/ruffing squeeze basically you can't be prevented from ruffing out whichever red suit gets unguarded.

[nige1]

Against South's 4♠, West leads ♣Q ruffed by East.
CyberYeti is right: Sacrifice ♣KA on 1st trick. Win East's return, cashing ♥K, ♦A, ♠AK, and exit in ♣s to West. On West's first ♣ continuation, play loser-on-loser: discard a ♦ from dummy and a ♥ from hand. On the next ♣, discard dummy's last ♦ and ruff in hand. East succumbs to a criss-cross trump squeeze.

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[Lovera]

Cyberyeti, on 2018-January-21, 05:05, said:

Nigel's line is cold against this.

Spoiler

To elaborate if you missed it, you play the heart K and overtake with the A. Then rumble 8 spades. if W keeps 3 diamonds and a heart, you keep 4 diamonds and table the 10, if he keeps 4 diamonds, you keep AQJ and a heart take the finesse, return to the 3 of hearts and take the finesse again.

As pointed out this fails to the 1750 version of the hand with a singleton 9 of diamonds in the opposite hand.

Looking for another ending instead i've lost this solution.