15-17 OR 18-19

[jerome keslin]

In KSU, in B25, when opener bids a diamond, which is overcalled at the 1 level, various bids are available to responder. However he might pass with as much as

xxx, Axx, KJx, xxxx or less.

If 4th seat now passes, how does opener differentiate between a hand with 15-17 or 18-19 with say KJx in overcallers suit?

[jerome keslin]

I forgot to state that responder's Ace was not in overcallers suit.

[Doug Deacon]

If opener has 15-16 with values in LHO's suit, facing a possible 0 count, no action is safe. He passes. 

If responder happens to hold the hand you described (4om333, 5-8), LHO is probably going down. That's a plus score and we're not missing game.

Strong notrumpers facing the zero count are going minus in 1NT or the opponents are making something, just like our opponents. Strong notrumpers facing the 5-8 count are going plus in 1N. Whether that's better or worse than our result depends on vulnerability, the opponents' hands and the play. At IMPs it's trivial. At matchpoints it's random and balances out in the long run.

If opener has 18-19 with values in LHO'S suit, he re-opens with 1NT, same as the strong notrumpers. Responder can invite with values.

If opener has 17 with values in LHO'S suit, pick one of the above.

Footnote: after 1m (1x) pass (2x), pass (pass)... responder with 4om333 (or 5om332) and 5-8 should typically reopen with a "surprise" double. This isn't in the notes but seems implied. 

Knowing responder's shape, An unbalanced opener will always have a safe spot in 3 of a m. Strong notrumpers will never find this -  responder can't safely double if opener might hold a WNT.

A balanced opener with defensive values may pass, bid 3 of either m, suggest 2S on a 4-3 (if x = H) or try 2N. Strong notrumpers may land elsewhere, but we have more info to chose where and how to play, so we rate to gain.

I once made this "surprise" double ATT with a strong KSU partner. We'd never discussed but he correctly deduced my shape and strength and acted accordingly.

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[Christopher Monsour]

Pass with 15-bad 17.   1N with good 17-19

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From: kaplan-s...@googlegroups.com <kaplan-s...@googlegroups.com> on behalf of jerome keslin <jet...@gmail.com>
Sent: Friday, February 21, 2025 5:59 AM
To: kaplan-s...@googlegroups.com <kaplan-s...@googlegroups.com>
Subject: 15-17 OR 18-19

 

In KSU, in B25, when opener bids a diamond, which is overcalled at the 1 level, various bids are available to responder. However he might pass with as much as

xxx, Axx, KJx, xxxx or less.

If 4th seat now passes, how does opener differentiate between a hand with 15-17 or 18-19 with say KJx in overcallers suit?

[Adam Wildavsky]

This double is in KSU under B-27 • MISCELLANEOUS COMPETITIVE:

Takeout. All competitive doubles of low contracts are for takeout after they (or we) have raised a suit. Typically, they say, as here: "For God's sake, let's not let them buy this hand so cheap."

Curiously, with some of my partners, regardless of NT range, most doubles of part-scores are for takeout, but this one is for penalties.

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[Christopher Monsour]

I would double with many balanced hands per B-27, but not with KJx in their suit. 

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From: kaplan-s...@googlegroups.com <kaplan-s...@googlegroups.com> on behalf of Adam Wildavsky <ad...@tameware.com>
Sent: Friday, February 21, 2025 9:43:21 AM
To: kaplan-s...@googlegroups.com <kaplan-s...@googlegroups.com>
Subject: Re: 15-17 OR 18-19

 

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[doug...@aol.com]

Indeed. When playing Neg Dbls, this is routine.

By opening 1m on 15-17 balanced, KS may let LHO into the auction with light 1M overcalls that wouldnt act over a SNT. 

Some cite this as a disadvantage for KS. 

However,  when opener reopens with a double and responder passes for penalty or bids to a better spot than 1NT, that disadvantage is not ours.

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