Competition Problem 177b
South to make seven spades. West leads the ♣J.
Successful solvers: To be announced in next update.
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