3. Hou Yifan resigns after 5 moves in the 2017 Gibraltar Masters

Hou Yifan resigns after 5 moves in the 2017 Gibraltar Masters

What ranking order did you give the players? Following FIDE dutch rules I do not get the same result so I assume it must be ranking order (which I thought was determined by rating starting the tournament).

e.g. Round 3.

First, no-one with a perfect score (2/2) could possibly have played each other yet. Second, no-one in the top group is a floater of any type - they have only played opponents with the same score. Third, no-one in the top group has a color preference; each has had a black and a white. This makes the edge cases irrelevant for switching pairing. Last, there are no byes in the group at 2.0.

The sort for the pairing is determined by the start of the tourney (I think?): http://www.chess-results.com/tnr257693.aspx?lan=1&art=5&turdet=YES&wi=984

The standings after round 2: http://www.chess-results.com/tnr257693.aspx?lan=1&art=1&rd=2&turdet=YES&wi=984

Note that these standings are not sorted by rating - which needs to happen before pairing.

After a sort we have: Nakamura Hikaru 2785 Adams Michael 2751 Yu Yangyi 2738 Vitiugov Nikita 2724 Naiditsch Arkadij 2702 Cheparinov Ivan 2689 Zvjaginsev Vadim 2679 Shankland Samuel L 2674 Howell David W L 2655 Iturrizaga Bonelli Eduardo 2652 Hou Yifan 2651 Piorun Kacper 2651 Anton Guijarro David 2650 Sethuraman S.P. 2637 Akobian Varuzhan 2633 Sutovsky Emil 2628 Lagarde Maxime 2594 Ju Wenjun 2583 Antipov Mikhail Al. 2580 Gopal G.N. 2579 Deac Bogdan-Daniel 2572 Grigoriants Sergey 2564 Donchenko Alexander 2559 Muzychuk Anna 2558 Huzman Alexander 2557 Mastrovasilis Athanasios 2551 Schroeder Jan-Christian 2550 Lagno Kateryna 2530 Stefanova Antoaneta 2512 Kollars Dmitrij 2500 Liang Awonder 2496 Bellahcene Bilel 2493 Cuenca Jimenez Jose Fernando 2492 Batsiashvili Nino 2492 Dragnev Valentin 2492 Kobo Ori 2482 Batchimeg Tuvshintugs 2390

Looking at just the top scoring section and sorting it by rank we find a few things. There are 37 players with a perfect score. In practice this means the lowest rated player will get matched with someone at 1.5. We find this is true, GM Batchimeg (37th rated with 2 pts) gets paired with Caruana (highest rated with 1.5 pts) as expected.

Since there are no collisions due to color or players previously playing, the expected pairings are easy. 1v19, 2v20, ... 18v36. In practice, some of the pairings were 1v20, 2v21, 3v19, 4v23, 5v27, 6v27, 7v28, 9v22, 10v30, 11v24. This resulted in #11 (Hou) playing #24 (Anna Muzychuk) instead of the rank #29 player.

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