North American Youth Chess Championships

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • #31
    Re: Rd. 2 Bd. 1 Preotu Game?

    Originally posted by Rene Preotu View Post
    Greg,

    They use SwissSys so I hope this will answer your question.
    lol - that answers all questions.
    ...Mike Pence: the Lord of the fly.

    Comment


    • #32
      Re: North American Youth Chess Championships

      Originally posted by Greg Norman View Post
      In the U-18 section,

      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)

      ?

      Comment


      • #33
        Re: North American Youth Chess Championships

        Are you saying that Swiss Sys messes up? I find that hard to believe. According to: http://www.fide.com/fide/handbook.ht...4&view=article

        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?

        Comment


        • #34
          Re: North American Youth Chess Championships

          Originally posted by Greg Norman View Post
          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)

          ?
          Swiss Manager's pairings for round 5
          Sorry, I don't have the time to format them nicely.

          Bo. SNo. Name Pts Res. Pts Name SNo.
          1 4 Colas Joshua 3½ - 3½ Pamatmat Jarod M 9
          2 8 Williams Justus D 3½ - 3 Qin Zi Yi (joey) 2
          3 14 FM Liang Awonder 3 - 3 FM Cao Jason 13
          4 3 Vibbert Sean 2½ - 2½ Preotu Razvan 1
          5 12 Kraiouchkine Nikita 2½ - 2½ Knox Christopher 10
          6 19 Itkin David 2½ - 2 Song Michael 7
          7 6 Ulrich Tommy 2 - 2 FM Chandra Akshat 5
          8 17 Inigo Aquino 2 - 2 Semianiuk Konstantin 11
          9 16 Chiku-Ratte Olivier Kenta 2 - 2 Ivanov Mike 18
          10 15 Sohal Tanraj S. 1½ - 2 Zhang Ruiyang Eric 20
          11 27 Song Guang Yu 1½ - 1½ Luo Zhao Yang 22
          12 21 Florea Alexandru 1 - 1 Farrant-Diaz Nathan 26
          13 29 Macdonald Sydney 1 - 1 Schneider Thomas G 24
          14 25 Nasir Pi 1 - 1 Zheng Kyle 28
          23 Sprumont Oscar ½ - - Bye

          Comment


          • #35
            Re: North American Youth Chess Championships

            Thank you, Rene, you are reinforcing my question.

            Comment


            • #36
              Re: North American Youth Chess Championships

              these are actual pairings from website:
              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)

              ?

              Comment


              • #37
                Re: North American Youth Chess Championships

                Originally posted by Greg Norman View Post
                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)

                ?
                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.

                Comment


                • #38
                  Re: North American Youth Chess Championships

                  Originally posted by Stephen Wright View Post
                  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
                  That may be the answer.

                  Comment


                  • #39
                    Re: North American Youth Chess Championships

                    Originally posted by Greg Norman View Post
                    Thank you, Stephen, I believe you are referencing:


                    That may be the answer.
                    It's good to know that SwissManager has a glitch. I'll send an email to the author and let him know.

                    Comment


                    • #40
                      Re: North American Youth Chess Championships

                      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.)

                      See http://www.fide.com/fide/handbook.ht...3&view=article, Section B.

                      Comment


                      • #41
                        Re: North American Youth Chess Championships

                        Originally posted by Rene Preotu View Post
                        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.

                        Comment


                        • #42
                          Re: North American Youth Chess Championships

                          Originally posted by Erik Malmsten View Post
                          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.

                          Comment


                          • #43
                            Re: Rd. 2 Bd. 1 Preotu Game?

                            Hi Rene:

                            Thanks - watching the game, I had thought Razvan had some difficult problems to solve! Looks like he did after I left.

                            Thanks again for letting me volunteer to help out.

                            Bob A

                            Comment


                            • #44
                              Re: Rd. 2 Bd. 1 Preotu Game?

                              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).

                              :(
                              Francis

                              Comment


                              • #45
                                Re: Re : Re: North American Youth Chess Championships

                                Some more pix from day 4: rounds 6 and 7.

                                https://plus.google.com/photos/10539...40124340308145

                                Comment

                                Working...
                                X