I love your videos, Joseph! -Ø ons. 12. feb. 2025 kl. 22:35 skrev Joseph Heled <[email protected]>:
> I spent some time on this. The best racing formula is K-Star (short for > Keith*). There are several videos discussing the topic in general > > https://www.youtube.com/watch?v=9qeStT6VtVg > > -Joseph > > On Thu, 13 Feb 2025 at 09:20, Wayne Joseph <[email protected]> wrote: > >> Hi all, >> >> I saw some squiffy behaviour in the Race Formulas - Keith Count feature, >> which did not agree with XG's conclusion. >> >> Please see short video here: >> https://fy0o.short.gy/wj_cy_keith_count_bug_gnubg >> >> XGID=-ABBA-C------------e--aaa-:1:1:1:00:0:0:0:3:10 >> >> GNUbg >> >> FR8AANpyAAAAAA:UQlgAAAAAAAE >> >> Chris Yep kindly cross-verified my suspicion as a bug. >> >> An excerpt of Chris' verification is below. The full thread on Facebook >> can be found here: >> https://www.facebook.com/groups/backgammonstrategy/permalink/3817038441898133/ >> >> Not critical, but please can the bug be fixed? >> >> Thank you. >> >> -------- >> >> >> CY >> *Yes, this error (bug) has likely existed for many years.I just checked >> all the boundary cases now. XG's doubling advice matches that given in Tom >> Keith's paper if the difference ("leader's" Keith Count minus "trailer's" >> Keith Count) is 2, 3, or 4. GNU's doubling advice matches that given in the >> paper if the difference is 3 or 4; however, if the difference is 2, GNU >> gives incorrect doubling advice (as you observed in your bearoff >> position).In addition to this error, however, GNU also doesn't truncate the >> "1/7" adjustment. According to the paper, the player on roll is supposed to >> increase his count by one seventh of the previous count, rounding down. GNU >> doesn't do any rounding. For example, if GNU's count is 36, it will >> increase this count by 36/7 (5.14) for a final count of 41.14. XG, on the >> other hand, will round the final count down to 41, as specified by the >> paper. Because GNU doesn't truncate this adjustment, additional errors >> occur (example below).In the position below, XG evaluates the Keith Counts >> as 41 to 37, so it recommends double/take. GNU, on the other hand, >> evaluates the Keith Counts as 41.14 to 37 (a difference of 4.14, which is >> more than 4), so it recommends a no double. In this position, XG is correct >> and GNU is incorrect (according to the paper).* >> [image: May be an image of text that says "19 20 21 22 23 24 13 1314 14 >> 15 16 131415161718 1718 17 18 WNW 64 KG MAI Ganmon eXtreme ko extreme >> Ganmon 121110 121110987 8 12 11 10 9 654321 3 6 5 4"] >> <https://www.facebook.com/photo.php?fbid=10231708555754825&set=p.10231708555754825&type=3&__cft__[0]=AZWP4gT20yOUew61xt8Vj7zf0P-Cbjd9CCfNbyy7VFEWOE-6qQ5wPtr21YFqKUtQUOYGhET785qp1dmj4MxJLXbT1wyhqYHAehqHe9QgUvqBVlZ0PhQkgzhGksZNq6DPuE7PUBvP8SFxholSKkJ5-uTW8buKTe7C7mTzbG7I5Pa2a1WOf0hpX9jUZ3X8TnYSWm5E6VxM6y8a_vXXwoNNBJc-&__tn__=R]-R> >> >>
