It’s a blend of how much distortion of the points vs how much distortion of the distribution. Here the system notes said the double would promise at least 4 spades. I think most of us would consider the double with only 3 spades with lots of points (17 maybe; certainly with 19). With only 2 spades? Maybe, but might require 20 HCP.
A bid showing 5-5, with 0 cards in higher suit? For all practical purposes, never.
+10 vs AA. Reissued
ETA: Very unusual results. procrastinator wins the regular challenge with +4.00. Low winning score, but even odder it is only 1.50 ahead of last place. That’s because the totals are only for people who competed all 16 deals, but include imps won or lost on hands played by anyone who did not complete all 16.
Lost to procrastinator by 34. Should I have known not to complete all 16 boards?
Reissued
+10 vs NN. Both of us aghast, I’m sure, at one push where partner butchered the defense against 3C, letting it make. We had overcalled 2H over the 1D opening. CHO had QJ of hearts and Jxx of diamonds, but chose to lead a diamond instead of a heart. That wasn’t fatal. He could have attacked hearts when he was next in, or even later, but he never led a heart so the contract made. Reissued
Declare only ended with only 3 completing. oirg won with a score of 8.33. Not a margin of 10.
Oops. It’s inevitable I’ll miss some of the group challenges since I can issue only one group challenge as SW1, so to have a regular and a Declare-only open at the same time one has to be issued as SW49, then I can’t see all my outstanding challenges at once.
I reissued that challenge as SW49 now, but screwed up and made it a Declare-only instead of a regular challenge. Maybe for overall balance both of the next two group challenges I issue will be Declare-only. Or maybe not. Shrug.
Lose to AA by 2. Reissued
ETA: Lose to procrastinator by 7. Reissued
EATA: This is from the current group challenge. Not giving much away. You do know that I did open 1D, and what happens next if you open 1D. You know that I considered calling 2NT next, but not whether I chose it. I’m just posting it due to the oddity that if I chose to bid 2NT over RHO’s 1H, the system notes describe it as a jump in notrump. The points shown doesn’t surprise me, but how the cheapest number of notrump is jump???
Oirg won the regular challenge with +20.25, a margin over 10. More than half of that margin was on the board shown, where he bid 3NT over 2H and played there, making. Everyone else bid 2NT over 2H and raised partner’s 3S bid to 4, down 1 most of the time (down 2 once). It isn’t clear which contract you would prefer to be in, since they aren’t likely to find the club ruff right away, but with spades 4-1 you aren’t going to make 4S whatever they lead. Reissued
ETA -9 to NN. Reissued
EATA: Lose to AA by 6. All on extra overtricks for us or extra undertricks collected against them. In each case with the same contract both tables. Reissued
One of the swings my way in the 2 way was a mistake I made that turned out well. I opened 1m, partner bid 1M, and RHO bid 1NT. Though I prefer double to be penalty, I thought double being support was standard, so I doubled. It turns out it is penalty. Despite holding a balanced 11 count, it went down, for a big swing.
Lose to procrastinator by 2. Lost 4 imps when he made 3D that I didn’t. Can’t be made against best defense, but I should have made it harder for them to find best defense. Reissued
ETA: oirg romps in the SW49 regular challenge with +32.66, a margin of much more than 10. Reissued as Declare-only, as it should have been.
AA wins the regular group challenge with +10.25, not a margin of 10. Reissued
Beat NN by 28 in a 57-29 slugfest. Reissued.
ETA: Beat AA by 17. Reissued
EATA: Beat procrastinator by 31. (In part because I gutlessly resisted overcalling a second-seat 3S with 3NT lacking a spade stopper. Partner didn’t have one either. I did play my 4D contract well to make it, scoring all 6 of my AKQ108x when LHO had J9xxx of trumps.) Reissued
I win the declare only with +12.75k, not by 10. Reissued
ETA: NN wins the regular challenge with +30.50, a margin over 10. Reissued
EATA: Lose to NN by 25. Reissued
EATA: Win vs AA by 12. Reissued
EATA: Lose to procrastinator by 6, including a push a 2DX (by them) making for -280. Should absolutely have been beaten at my table (as declarer played; not best). Not as clear what best defense is, and at procrastinator’s table it was going to make after his shift at trick 2 (which would have been right on other lies of the cards.) Reissued
NN wins the Declare-only with +3.25, obviously not by 10.
I thought I was incredibly lucky on this hand, to have misplayed it (after thinking of the successful line) but rejecting it because I had the bidding wrong in my mind. But each of the rest of you played it the same way. Why?
Looking at all four hands, we should be down 2, but LHO starts with the heart ace and shifts to the diamond ace. And we?
We would like to pitch our club loser on a good diamond, but if LHO plays a club next we won’t have an entry to do it. Unless we unblock the diamond K. Then we can win the club ace, pull trumps, hook the diamond J, pitch the club, and take 10 tricks. It seems like by far the best line, consistent with the bidding, but no one took it. But LHO didn’t find the diamond shift, so we all took 10 tricks.
Reissued.
Lose by 3 to NN. Lost 1 imp by ridiculous misdefense by bot against his 3NT. Same auction; tricks played in a different order (but no better or worse) by NN. 8 imps to me on a stupid misclick, but still would have been 8 (in a different contract) without the misclick. Reissued
ETA: win by 6 vs AA. Reissued
I win the regular challenge with +14.75, not by 10. I win against procrastinator by 4 when I gambled CHO would have a spade stopper for 3NT despite his bidding. Both reissued.
Lose to NN by 8. Pro tip: it doesn’t help to be down 3 in 1NT when your opponent is making with 2 overtricks at the other table. Contract can never be made against best defense as the cards lie. Reissued.
NN wins the Declare only with +15.25, by 1. Reissued.
Lose by 16 to AA. Hard to win if you lose 17 on one board by stopping in game when your counterpart bids and makes a grand. Reissued.
Expecting to lose to procrastinator even though many boards left to play. Still in the middle, but one very unfortunate misdecision that will be at best a push. Then very annoyed when partway through the hand I realized a 100% sure thing for my contract, then one trick later forgot my plan and went down. I would sure feel better if I had made that, but it’s unlikely that deal will be key.
ETA: No, pulled out a win by 7 against procrastinator. Sure enough, I had lost 10 on the first decision. On the second, we reached exactly the same position, after a different sequence of plays, needing two tricks to make our contract and had a high trump stiff in one hand and the other high trump (even higher) doubleton in the other hand, and overtook with the doubleton. Would have produced an overtrick in our part score had the opponents trumps been 2-1 (originally 3-3 or 4-2; overtake necessary for entry reasons), but down when trumps were 3-0 (originally 5-1). Reissued
NN wins the regular challenge with +13.75, by 4. (new policy for group challenges. Will specify margin over 2nd, but not who was second, even though all players can easily tell everyone’s score). Reissued.
ETA: Win by 9 vs NN.
This time the grand needed only trumps 2-2 or 3-1, and they were. But NN stopped in six, so I lost only 13 for stopping in game (and would have pulled this match out even had he bid the grand.) Reissued.
ETA: Lost by 16 to procrastinator. Reissued
I win the Declare-only with +14.50, a margin of 3.75. Reissued
I lose to AA by 5. Reissued
When reviewing a hand, I can see double dummy. But this only tells me what each play would accomplish in turn (e.g., =, -1, +1); but is there a way for me to see how double dummy would play it out to make it? In one I am reviewing now, I (apparently) made the wrong choice at trick 3, and can’t figure out how to see what I should have done. It’s an active challenge, so can’t ask you guys for help just yet.
Spoiler alert - I’ll probably lose a lot of points on the hand, and if I had played it right, I probably would have gained a lot of points. 
