Competition Problem 177b
South to make seven spades. West leads the ♣J.
Successful solvers: Steve Bloom, Ian Budden, Abby Chiu, Ed Lawhon, Leigh Matheson, Steve McVea, Sebastian Nowacki, A.V. Ramana Rao, Rajeswar Tewari, Andries van der Vegt, Daniel de Lind van Wijngaarden, Dan Wolkowitz, Dick Yuen. Suggested DRs ranged from 2 to 4, averaging closer to 2 than 3.
Winning the opening lead, South cashes, in either order, the ♠A and ♦A before finessing North’s ♥Q. North then wins, in either order, the ♥A and ♠9 (which East should duck to prevent the cheap club ruff). South discards the ♦2 on the ♥A and ruffs a diamond. The lead of the ♠Q now produces what I tentatively called a seesaw double ruffing guard squeeze (where double refers here to the number of ruffing menaces—see below) against West in this position:
If West discards a club, the ♠Q wins and North ruffs a club to leave the South hand high with a ruffing entry. Otherwise, West discards a red suit king and North overtakes to take a ruffing finesse against East in that suit. North’s losers in the other red suit go on the top clubs and North ruffs a club to score the established winner.
This ending looks new to me. Has it ever been seen before? Franco Baseggio is bothered by my ambivalent use of double and proposes tandem to replace it, observing that this would allow triple to be included with its normal connotation: triple seesaw tandem ruffing-guard squeeze. (He's added a suitable hyphen too.)
See the solution to Competition Problem #4 for the recommended tabular format if you prefer not to write in English prose.
Hugh Darwen, 2019