More on simulation

[thorvald]

After losing a Robot Challenge i looked at this board where I los t1 IMP

 

[hv=url=https://www.bridgebase.com/tools/handviewer.html?bbo=y&lin=pn%7CHuman%2CRobot%2CRobot%2CRobot%7Cst%7C%7Cmd%7C3SKQ52HQ5DA85CQ765%2CSJ643HT876DKJ4CK4%2CSAT9HKJ4D9762CAT3%2CS87HA932DQT3CJ982%7Csv%7CB%7Cah%7CBoard%2013%7Cmb%7C1D%7Can%7CMinor%20suit%20opening%20--%203%2B%20%21D%3B%2011-21%20HCP%3B%2012-22%20total%20points%7Cmb%7CP%7Cmb%7C1S%7Can%7COne%20over%20one%20--%204%2B%20%21S%3B%206%2B%20total%20points%7Cmb%7CP%7Cmb%7C1N%7Can%7C2-5%20%21C%3B%204-5%20%21D%3B%202-4%20%21H%3B%202-3%20%21S%3B%2012-14%20HCP%7Cmb%7CP%7Cmb%7C3N%7Can%7C4%2B%20%21S%3B%2017-%20HCP%3B%2013%2B%20total%20points%7Cmb%7CP%7Cmb%7CP%7Cmb%7CP%7Cpc%7CC2%7Cpc%7CC5%7Cpc%7CCK%7Cpc%7CCA%7Cpc%7CD2%7Cpc%7CDT%7Cpc%7CD5%7Cpc%7CDJ%7Cpc%7CH7%7Cpc%7CH4%7Cpc%7CHA%7Cpc%7CH5%7Cpc%7CH3%7Cpc%7CHQ%7Cpc%7CH6%7Cpc%7CHK%7Cpc%7CD6%7Cpc%7CD3%7Cpc%7CD8%7Cpc%7CDK%7Cpc%7CH8%7Cpc%7CHJ%7Cpc%7CH9%7Cpc%7CC6%7Cpc%7CD7%7Cpc%7CDQ%7Cpc%7CDA%7Cpc%7CD4%7Cpc%7CS2%7Cpc%7CSJ%7Cpc%7CSA%7Cpc%7CS8%7Cmc%7C10%7C]399|300[/hv]

 

The first 7 tricks looks very normal, but at trick 8 the West Robot play ♠J but by counting the hand the bot knows ♠A is in north as north has shown 12-14 HCP.

 

On the actual layout declarer can take the finesse so using double dummy it will not cost, but when simulating it is not possible to find a layout, where it gains