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lorserker / ben

a game engine for bridge
GNU General Public License v3.0
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Extreme blunder in defence in B23 of match240310-_WBridge5_v_ben0308p5dd.pbn #120

Open ThePokerDude opened 6 months ago

ThePokerDude commented 6 months ago

Ben can win the trick with Qs but wins with As instead image

ThePokerDude commented 6 months ago

[Event ""] [Site ""] [Date ""] [Board "23"] [Dealer "W"] [Vulnerable "All"] [Deal "W:J83.KQJ8.9854.T4 K754.A94.KJ7.A95 AQ62.76.A3.KQ872 T9.T532.QT62.J63"] [Scoring ""] [BCFlags "1f"] [Generator "BridgeComposer Version 5.104.1"] {PAR of the deal: 3S = played by east: 140 points} {Feasability: 4 6 6 4 6 8 7 7 9 7 4 6 5 4 6 8 7 7 9 7 [South "WBridge5"] [West "ben0308p5dd"] [North "WBridge5"] [East "ben0308p5dd"] [Declarer "N"] [Contract "1NTX"] [Result "8"] {PAR of the deal: 3S = played by east: 140 points} {Feasability: 4 6 6 4 6 8 7 7 9 7 4 6 5 4 6 8 7 7 9 7} [Auction "W"] Pass 1NT X Pass Pass Pass [Play "E"] CK c3 C4 ca DA d2 D5 dk CQ c6 CT c5 C8 cj H8 c9 D3 d6 D9 dj S2 dt D8 d7 S6 dq D4 s5 SA st S8 s7 C7 h2 S3 h9 C2 ht SJ h4 SQ s9 HK sk H7 h3 HQ ha H6 h5 HJ s4

ThorvaldAagaard commented 6 months ago

The BEN reasoning here is image

Now we have only 20 visible samples, but it seems partner has SK most of the times.

We have 2 tricks, and 2 in clubs, so winning SQ, we will probably have to give declarer 2 Heart-tricks at the end. By using SA we might set up a squeeze against declarer.

So should we trust the neural network or go for the 7th trick?

ThorvaldAagaard commented 6 months ago

The key to this deal is to introduce signaling, so West at the third club can deny interest in spades.