Большая швейцарка ФИДЕ 2021 — международный шахматный турнир, проходивший с 25 октября по 8 ноября 2021 года в Риге (столице Латвии) и являвшийся частью отборочного цикла к Матчу за звание чемпиона мира по шахматам 2023.
Турнир проходил по швейцарской системе в 11 туров. Контроль времени: 1 час 40 минут на 40 ходов, далее 50 минут на 20 ходов, потом 15 минут до конца партии с добавлением 30 секунд на каждый ход, начиная с первого хода. Призовой фонд турнира составил $ 425 000.
В турнире приняли участие 108 шахматистов. Победителем (с отрывом в пол-очка, набрав 8 очков из 11) стал французский шахматист иранского происхождения Алиреза Фирузджа. По результатам Большой швейцарки в турнир претендентов 2022 прошли Фирузджа и занявший второе место Фабиано Каруана; на тот момент в турнир претендентов уже прошли Ян Непомнящий, Теймур Раджабов, Ян-Кшиштоф Дуда и Сергей Карякин.
Параллельно с открытым турниром проходил женский турнир, в котором победила китайская шахматистка Лэй Тинцзе.
Турнирная таблица
{| class="wikitable" style="font-size:90 %;" |+ Большая швейцарка ФИДЕ 2021 (число в скобках означает номер противника) |- ! !! Имя !! Рей. !! 1 !! 2 !! 3 !! 4 !! 5 !! 6 !! 7 !! 8 !! 9 !! 10 !! 11 !! !! !! !! |- |align=center|1 |align=left| |align=center|2770 | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | |align=center|8 |align=center|68,0 |align=center|72,0 |align=center|50,25 |- |align=center|2 |align=left| |align=center|2800 | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | |align=center|7½ |align=center|67,0 |align=center|72,5 |align=center|49,75 |- |align=center|3 |align=left| |align=center|2654 | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | |align=center|7½ |align=center|63,5 |align=center|68,5 |align=center|45,75 |- |align=center|4 |align=left| |align=center|2704 | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | |align=center|7 |align=center|66,5 |align=center|72,0 |align=center|44,50 |- |align=center|5 |align=left| |align=center|2630 | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | |align=center|7 |align=center|65,5 |align=center|70,0 |align=center|43,25 |- |align=center|6 |align=left| |align=center|2763 | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | |align=center|7 |align=center|65,0 |align=center|70,0 |align=center|43,50 |- |align=center|7 |align=left| |align=center|2666 | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | |align=center|7 |align=center|64,5 |align=center|70,0 |align=center|42,25 |- |align=center|8 |align=left| |align=center|2659 | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:white; color:black" | | style="background:black; color:white" | |align=center|7 |align=center|64,5 |align=center|68,5 |align=center|41,50 |- |align=center|9 |align=left| |align=center|2658 | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | |align=center|7 |align=center|62,5 |align=center|66,5 |align=center|40,25 |- |align=center|10 |align=left| |align=center|2664 | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | |align=center|7 |align=center|61,5 |align=center|65,5 |align=center|40,50 |- |align=center|11 |align=left| |align=center|2658 | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | |align=center|7 |align=center|61,0 |align=center|65,0 |align=center|39,25 |- |align=center|12 |align=left| |align=center|2690 | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | |align=center|7 |align=center|60,5 |align=center|66,0 |align=center|41,50 |- |align=center|13 |align=left| |align=center|2654 | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | |align=center|7 |align=center|60,5 |align=center|64,5 |align=center|39,75 |- |align=center|14 |align=left| |align=center|2720 | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | |align=center|7 |align=center|60,0 |align=center|64,5 |align=center|40,00 |- |align=center|15 |align=left| |align=center|2643 | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:black; color:white" | | style="background:white; color:black" | |align=center|7 |align=center|60,0 |align=center|63,0 |align=center|39,25 |- |align=center|16 |align=left| |align=center|2699 | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | |align=center|7 |align=center|56,5 |align=center|61,5 |align=center|39,00 |- |align=center|17 |align=left| |align=center|2605 | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | |align=center|6½ |align=center|66,5 |align=center|70,5 |align=center|40,75 |- |align=center|18 |align=left| |align=center|2652 | style="background:white; color:black" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" | | style="background:white; color:black" | |align=center|6½ |align=center|64,0 |align=center|68,0 |align=center|38,75 |- |align=center|19 |align=left| |align=center|2714 | style="background:black; color:white" | | style="background:white; color:black" | | style="background:black; color:white" |