tag:blogger.com,1999:blog-4459360717297142573.post5205442920229796759..comments2024-03-29T18:31:49.454+11:00Comments on chessexpress: Swiss Pairings TestShaun Presshttp://www.blogger.com/profile/00897215011002594039noreply@blogger.comBlogger12125tag:blogger.com,1999:blog-4459360717297142573.post-40555467803620476282008-12-31T22:35:00.000+11:002008-12-31T22:35:00.000+11:00KB said:In my view Ian's pairing of the first grou...KB said:<BR/><BR/>In my view Ian's pairing of the first group (5-1, 15-3, 4-7) is preferable to Garvin's (5-1, 7-3, 4-15) as in the first case 3,4 and 7 are all granted colour preference while in the second case 7 and 4 are but 3 are not.<BR/><BR/>Garvin's reply:<BR/><BR/>Since your post, I put this situation into Swiss Master 5.5 and it gives the pairings KB lists for 1 point score group.<BR/><BR/>P.S. Have just seen Shaun's reply. Shaun you can add Swiss Master as to agreeing with the 1 point score group that KB lists.Garvinhttps://www.blogger.com/profile/04252527246904556251noreply@blogger.comtag:blogger.com,1999:blog-4459360717297142573.post-1875859057318175392008-12-31T22:31:00.000+11:002008-12-31T22:31:00.000+11:00Actually you are right. So fixated on the bottom s...Actually you are right. So fixated on the bottom set of pairings I didn't check Garvin's top set.<BR/>The correct answer is actually<BR/>5v1 15v3 4v7 6v9 2v8 10v12 14v11<BR/>as given by Stewart Reuben (and agreed with by Swiss Perfect).Shaun Presshttps://www.blogger.com/profile/00897215011002594039noreply@blogger.comtag:blogger.com,1999:blog-4459360717297142573.post-45745203038928518262008-12-31T22:01:00.000+11:002008-12-31T22:01:00.000+11:00In my view Ian's pairing of the first group (5-1, ...In my view Ian's pairing of the first group (5-1, 15-3, 4-7) is preferable to Garvin's (5-1, 7-3, 4-15) as in the first case 3,4 and 7 are all granted colour preference while in the second case 7 and 4 are but 3 are not.<BR/><BR/>Relative Criteria heading + rule B4 makes it clear that transpositions and even exchanges may be applied to ensure as many players as possible receive their colour preference.Kevin Bonhamhttps://www.blogger.com/profile/06845545257440242894noreply@blogger.comtag:blogger.com,1999:blog-4459360717297142573.post-34504245808831609182008-12-31T21:28:00.000+11:002008-12-31T21:28:00.000+11:00We have a winner! Garvin has given the correct pai...We have a winner! Garvin has given the correct pairings (once he swapped 6v9).<BR/>Ian Rout gets some sympathy for pairing 2v9 in round 2, as Stewart Reuben told me that a very experienced International Arbiter did exactly the same thing when attempting to answer the question.<BR/>Where I (and everyone else) went wrong was in the pairing of the upfloat for player 2. Possibly as a result of learning the Lim system previously I went looking for an opponent for 2 that had a compatible colour preference. As a result I paired 2v11 followed by 8v12 and 10v14. <BR/>However the first step in working out pairings is to calculate the magic w,b,p and q numbers. In the case of the group (S1) containing player 2 (on 0.5) and the rest (S2) (all on 0), q=1 which means that you can have 1 pairing where both players do NOT get their colour preferences. Therefore 2 v 8 is both an acceptable, and indeed required pairing, leaving 10v12 and 14v11 as the pairings from the bottom group.Shaun Presshttps://www.blogger.com/profile/00897215011002594039noreply@blogger.comtag:blogger.com,1999:blog-4459360717297142573.post-45622129318260095202008-12-31T20:26:00.000+11:002008-12-31T20:26:00.000+11:00Er yes, 2 and 9 have played, I missed that.Er yes, 2 and 9 have played, I missed that.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4459360717297142573.post-41288576723643718612008-12-31T19:52:00.000+11:002008-12-31T19:52:00.000+11:00For my pairing answer, it should read 6 v 9, not 9...For my pairing answer, it should read 6 v 9, not 9 v 6.<BR/><BR/>6 had black in round one, 9 had white in round one, so when paired together, 6 is due white and 9 is due black.Garvinhttps://www.blogger.com/profile/04252527246904556251noreply@blogger.comtag:blogger.com,1999:blog-4459360717297142573.post-22013845927970625562008-12-31T18:19:00.000+11:002008-12-31T18:19:00.000+11:002 v 9 is incorrect for Part B as they have already...2 v 9 is incorrect for Part B as they have already played in round one, so can not be paired again.Garvinhttps://www.blogger.com/profile/04252527246904556251noreply@blogger.comtag:blogger.com,1999:blog-4459360717297142573.post-16051754979183480962008-12-31T18:18:00.000+11:002008-12-31T18:18:00.000+11:005 v 17 v 34 v 159 v 62 v 810 v 1214 v 115 v 1<BR/>7 v 3<BR/>4 v 15<BR/>9 v 6<BR/>2 v 8<BR/>10 v 12<BR/>14 v 11Garvinhttps://www.blogger.com/profile/04252527246904556251noreply@blogger.comtag:blogger.com,1999:blog-4459360717297142573.post-44445759720497535702008-12-30T20:13:00.000+11:002008-12-30T20:13:00.000+11:00Getting closer ( and closer than I did), but still...Getting closer ( and closer than I did), but still not entirely correct.Shaun Presshttps://www.blogger.com/profile/00897215011002594039noreply@blogger.comtag:blogger.com,1999:blog-4459360717297142573.post-84868447938598995742008-12-30T17:19:00.000+11:002008-12-30T17:19:00.000+11:00For Part B how about5-115-34-72-96-810-1214-11For Part B how about<BR/><BR/>5-1<BR/>15-3<BR/>4-7<BR/>2-9<BR/>6-8<BR/>10-12<BR/>14-11Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4459360717297142573.post-57237785848792044912008-12-30T16:18:00.000+11:002008-12-30T16:18:00.000+11:00Yes, we were allowed paper, so it would be a good ...Yes, we were allowed paper, so it would be a good idea to use it!<BR/>Your part A is correct, but not part B (and not in the same way I got part B wrong either).Shaun Presshttps://www.blogger.com/profile/00897215011002594039noreply@blogger.comtag:blogger.com,1999:blog-4459360717297142573.post-63643915852410657952008-12-30T13:29:00.000+11:002008-12-30T13:29:00.000+11:00Were you allowed paper? :POk I'll try.Part A: Roun...Were you allowed paper? :P<BR/>Ok I'll try.<BR/><BR/>Part A: Round 1 pairings would be:<BR/><BR/>1v8 1:0<BR/>9v2 0.5-0.5<BR/>3v10 1-0<BR/>11v4 0-1<BR/>5v12 1-0<BR/>13v6 0.5-0.5<BR/>7v14 1-0<BR/>with player 15 having a full-point bye for round 1.<BR/><BR/>Part B: Pairings for Round 2 (by my guess)<BR/><BR/>4v1<BR/>7v3<BR/>15v5<BR/>2v9<BR/>6v11<BR/>8v12<BR/>10v14Alana Chibnallhttps://www.blogger.com/profile/14177910849831389183noreply@blogger.com