On 2 May, 10:30, Andr=E9 Steffens <andre.steff...@[EMAIL PROTECTED]
> wrote:
> J6
> KQT7
> AQ72
> A93
>
> 5
> J6532
> KT5
> KQ86
>
> MP-pairs all green, South deals
> 2H* (pass) 4H (4S)
>
> 2H: Muiderberg: 5 card major, undisclosed 4+ card in a minor, <11
> points
> 4H: to play, can be very variable in strength
>
> 4S is only down one, so bidding 5H is the winning action. However, who
> beteween North and South is the one that should bid it?
>
> -The singleton spade is essential, but in my view the preemptor does
> not mingle further in the auction unless partner asks him to.
>
> -Being North, I would have doubled because of my doubleton spades.
>
> I fed the hand to Jack 4.0 (former world champion computer bridge) and
> to my surprise Jack made the North hand bid 5 H!
>
> Who explains it?
A lot depends on your minimum for a Muiderberg 2, but I assume (at
these colours and positions) 5+. That means you have (from N's
perspective) two S losers, one H loser at most, and half/one loser in
each minor. Call it 5 tricks to lose in H, at worst (give partner xx/
AJxxx/xxxx/xx). If this is the case, opps are losing 0 spades, 1
(maybe 2) H, and one in each minor. There's a fair chance 4S is
making.
Now give partner a little more (e.g. x/Axxxx/Kxxx/xxx) and you're
losing 1 S and 2 C; opps are losing 1 C, 2 D, 1 H. Neither 4S nor 5H
is making.
Give partner a perfect fit (x/Axxxx/Kxxx/Kxx) and you're losing 1 S
and one C; they're losing 1 H, 2 D and 2 C. You're making; they're
going 2 off.
It seems to me that doubling is the percentage action; there are few
hands on which they can make 4S AND the sacrifice is cheap. If they
make, that's bridge; this is MPs so I double.
NB: At the table, holding the N hand, I almost certainly bid 5H as I
don't think fast enough, and on this particular board get a lucky good
score.
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