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I am having a hard time understanding the pairing logic for round 5. There are 3 players in the 3.5 score group, there are 3 players in the 3.0 score group.
So none of the 3.0 players should have to play a 2.5 player. But that is precisely what is happening. Why isn't Awonder Liang (3.0) playing Jason Cao (3.0)?
Maybe I should elaborate:
Here is color history of 3.5 and 3.0 score groups:
Colas WBWB
Pamatmat BWBW
williams WBWB
liang WWBB
cao BWBW
Qin WBWW
so why aren't the pairings:
Colas (3.5) xxx Pamatmat (3.5)
Williams (3.5) xxx Qin (3.0)
Liang (3.0) xxx Cao (3.0)
The basic principles of a Swiss System tournament are:
1. The number of rounds to be played is declared beforehand.
2. Two players may play each other only once.
3. Players are paired with others of the same score, or nearest score.
4. When possible, a player is given the white pieces as many times as he is given the black pieces.
5. When possible, a player is given the colour other than that he was given the previous round.
6. The final ranking order is determined by the aggregate of points won: 1 point for a win, 0.5 point for a draw and 0 point for a loss. A player whose opponent fails to appear for a scheduled game receives one point.
No exceptions appear present to necessitate pairing out of the score group. So why were they?
White Res. Black
FM Joshua Colas (3.5) - Jarod Pamatmat (3.5)
Justus Williams (3.5) - FM Jason Cao (3.0)
Razvan Preotu (2.5) - FM Ziyi [Joey] Qin (3.0)
FM Awonder Liang (3.0) - Sean Vibbert (2.5)
David Itkin (2.5) - Christopher Knox (2.5)
Nikita Kraiouchkine (2.5) - Thomas Ulrich (2.0)
Mike Ivanov (2.0) - FM Akshat Chandra (2.0)
Olivier Kenta Chiku-Ratte (2.0) - Michael Song (2.0)
Aquino Inigo (2.0) - Konstantin Semianiuk (2.0)
Tanraj Sohal (1.5) - Eric Ruiyang Zhang (2.0)
Guangyu Song (1.5) - Zhao Yang Luo (1.5)
Alexandru Florea (1.0) - Nathan Farrant-Diaz (1.0)
Sydney MacDonald (1.0) - Thomas George Schneider (1.0)
Pi Nasir (1.0) - Kyle Zheng (1.0)
Oscar Sprumont (0.5) 1-0 See T.D.
So why are these paired:
Razvan Preotu (2.5) - FM Ziyi [Joey] Qin (3.0)
FM Awonder Liang (3.0) - Sean Vibbert (2.5)
Not that I trust SwissSys, but if Qin was paired with Williams he would be the upfloat two rounds in a row, which FIDE frowns on.
Thank you, Stephen, I believe you are referencing:
0.10
A floater who has floated the round just before shall not be floated due to section 9.3.d provided:
this will not produce other floaters of the types a, b, c of section 10.9
this will not decrease the number of pairings of that score-group
Not necessarily - within the Dutch system, the criteria that "No player shall receive an identical float in two consecutive rounds" is relatively low, therefore the Swiss Manager pairings may well be better than those produced by SwissSys. I just cited it as a possible explanation for why SwissSys produced the pairings it did. (Personally I would take what Swiss Manager produces over SwissSys any day.)
It's good to know that SwissManager has a glitch. I'll send an email to the author and let him know.
I believe that SwissManager is a FIDE-accepted software so I doubt it has the glitch, Swiss Sys isn't FIDE listed and has had bad glitches in big tournaments over the years. I think it is best to pair using both and compare.
I believe that SwissManager is a FIDE-accepted software so I doubt it has the glitch, Swiss Sys isn't FIDE listed and has had bad glitches in big tournaments over the years. I think it is best to pair using both and compare.
I have to admit that I manually inputted the pairings in SwissManager after the 2nd round. SwissManager pairings for the 3rd round where slightly different (Olivier Kenta Chiku-Ratte got white twice rd.2 and 3 in SwisSYs and Kyle Zheng got a 1 point bye after he already had a 0 point bye in 1st round). SwissManager didn't allowed this so I had to force the 1 point bye. Maybe this created some malfunctions in SwissManager when it produced the round 5 pairings.
Games were live at the start this morning (2 still are), but a TD rummaging for a barf bag
under the control centre, disconnected the MonRoi system amongst other electronics !
We are still working on restoration - meanwhile games that are frozen will be updated
once the MonRoi devices return from the players (currently showing '?' as input).
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