פורסם ביום 05.06.2012
אנו שמחים לפרסם את הכתבה השלישית מתוך שבע- בנושא " הערכת היד -בסלאמים " (המקור: mrbridge).
והפעם, השימוש בהכרזת 2NT
לכתבה לחץ כאן
HAND EVALUATION 48
Hand Evaluation in Slams
Part 3 of 7
by Bernard Magee
בחלוקה 3, המכרז לוקח זמן, אבל בסופו של דבר מגלה הכל.
West uses the 2NT rebid to show 15-19 points, retaining the space to explore greater things (a 3NT rebid might well have finished the auction). Since 2NT is forcing to game, East can continue describing his hand and, with worries about the spade suit as well as real interest in playing in a heart contract, East rebids 3. Now West rebids hearts to suggest a five-card suit and East is happy to have found the best contract so raises to 4.
East probably thinks that that will be the end of the auction, but far from it. Because East has described his hand accurately, West is able to go on. East has suggested shortage in spades by bidding the other three suits, so it looks as though the hands are fitting together really well. East has shown 10+ points by responding 2 and, since he is short in spades, these points will be spread amongst the other suits. With no losing spades (West's ace will take care of East's singleton), West can add up the points outside spades: he has 15 which, added to partner's 10, come to 25 points in three suits – with just 5 important points missing, West should certainly try for slam.
West uses KCB and, when East shows one key card (the king of hearts), West is able to bid the excellent slam.
Once again a good, long exchange of information allows you to piece the two hands together; it is easy to see why you need an extra round of bidding and hence the reason for the 2NT rebid.
Knowing about the shortage in partner's hand allows you to evaluate your combined hands to the maximum. If you change West's ace and eight of spades to the king-queen of the suit (giving him more points), you now know there is a loser in spades, so, with 5 points missing in the other three suits, there are likely to be two losers and therefore slam would not be on.
Because the knowledge of a singleton can be so useful with respect to slam bidding, experts like to show one as often as possible and this has led to the widespread use of splinter bids.