Gauthier Pieffer ha enfrentado a 88 oponentes a lo largo de su carrera.

Player Team(s) Games
Henry Ahven
U16 Estonia (Euro U16 B)
1
Alexander Andreev
U16 Germany (Euro U16 B)
1
Ilhan Arabadzhiev
U16 Bulgaria (Euro U16 B)
1
Viktar Ausepian
U16 Belarus (Euro U16 B)
1
Kristof Bajalinov
U16 Hungary (Euro U16 B)
1
Gaspar Bibikov
U16 Estonia (Euro U16 B)
1
Emil Binev
U16 Bulgaria (Euro U16 B)
1
Bence Biro
U16 Hungary (Euro U16 B)
1
Florian Borstler
U16 Germany (Euro U16 B)
1
Benedikt Breiling
U16 Germany (Euro U16 B)
1
Kilian Cato
U16 Finland (Euro U16 B)
1
Zoltan Csempesz
U16 Hungary (Euro U16 B)
1
Planimir Dafinov
U16 Bulgaria (Euro U16 B)
1
Sander De Roos
U16 Netherlands (Euro U16 B)
1
Harald Debelka
U16 Germany (Euro U16 B)
1
Martin Dorbek
U16 Estonia (Euro U16 B)
1
Martin Floris 1
Daniel Forrai
U16 Hungary (Euro U16 B)
1
Max Franken
U16 Netherlands (Euro U16 B)
1
Niels Giffey
U16 Germany (Euro U16 B)
1
Richard Grznar 1
Adam Hajer
U16 Hungary (Euro U16 B)
1
Niki Halonen
U16 Finland (Euro U16 B)
1
Siarhei Hancharonak
U16 Belarus (Euro U16 B)
1
Paavo Heinaharju
U16 Finland (Euro U16 B)
1
Juho Helenius
U16 Finland (Euro U16 B)
1
Plamen Hristov
U16 Bulgaria (Euro U16 B)
1
Aliaksandr Hrumiantsev
U16 Belarus (Euro U16 B)
1
Valiantsin Ihnatchyk
U16 Belarus (Euro U16 B)
1
Darin Ivanov
U16 Bulgaria (Euro U16 B)
1
Lennard Jordell
U16 Germany (Euro U16 B)
1
Aliaksei Kachan
U16 Belarus (Euro U16 B)
1
Peter Kalman 1
Vitali Kazlouski
U16 Belarus (Euro U16 B)
1
Mart Kihulane
U16 Estonia (Euro U16 B)
1
Sebastian Koch
U16 Germany (Euro U16 B)
1
Jakub Kozubik 1
Uladzimir Krysevich
U16 Belarus (Euro U16 B)
1
Yaroslav Kurapov
U16 Belarus (Euro U16 B)
1
Johannes Kuslap
U16 Estonia (Euro U16 B)
1
Antti Laukkanen
U16 Finland (Euro U16 B)
1
Daniel Leithner
U16 Germany (Euro U16 B)
1
Taavi-Peeter Liiv
U16 Estonia (Euro U16 B)
1
Raul Liivrand
U16 Estonia (Euro U16 B)
1
Hai Long Li
U16 Netherlands (Euro U16 B)
1
Boris Lopusniak 1
Aleksander Machowski
U16 Germany (Euro U16 B)
1
Ventsislav Manuilov
U16 Bulgaria (Euro U16 B)
1
Lukas Melotik 1
Lukas Mician 1
Markus Molenius
U16 Finland (Euro U16 B)
1
Aron Moravcsik
U16 Hungary (Euro U16 B)
1
Jaroslav Moravek 1
Tomas Mrvis 1
Stefan Mulder
U16 Netherlands (Euro U16 B)
1
Andrei Navoichyk
U16 Belarus (Euro U16 B)
1
Gergo Nedelcu
U16 Hungary (Euro U16 B)
1
Tomas Nemcok 1
Kai Niemisto
U16 Finland (Euro U16 B)
1
Antto Nikkarinen
U16 Finland (Euro U16 B)
1
Jukka Ohtonen
U16 Finland (Euro U16 B)
1
Joonas Ollisaar
U16 Estonia (Euro U16 B)
1
Matej Ondrejka 1
Joost Padberg
U16 Netherlands (Euro U16 B)
1
Ventsislav Petkov
U16 Bulgaria (Euro U16 B)
1
Jan Pisar 1
Lachezar Radev
U16 Bulgaria (Euro U16 B)
1
Kristjan Rinaldo
U16 Estonia (Euro U16 B)
1
Mikalai Salauyou
U16 Belarus (Euro U16 B)
1
Sasu Salin
U16 Finland (Euro U16 B)
1
Jur Schroder
U16 Netherlands (Euro U16 B)
1
Georgi Sirakov
U16 Bulgaria (Euro U16 B)
1
Gian Slagter
U16 Netherlands (Euro U16 B)
1
Janar Soo
U16 Estonia (Euro U16 B)
1
Daniel Stawowski
U16 Germany (Euro U16 B)
1
Norbert Timko
U16 Hungary (Euro U16 B)
1
Lauri Toivonen
U16 Finland (Euro U16 B)
1
Jeffrey Touw
U16 Netherlands (Euro U16 B)
1
Quincy Treffers
U16 Netherlands (Euro U16 B)
1
Andrei Tsyvinski
U16 Belarus (Euro U16 B)
1
Dimeo Van Der Horst
U16 Netherlands (Euro U16 B)
1
Kaz Van Der Waard
U16 Netherlands (Euro U16 B)
1
Jeroen Van Vugt
U16 Netherlands (Euro U16 B)
1
Samuli Vanttaja
U16 Finland (Euro U16 B)
1
Juliyan Vasilev
U16 Bulgaria (Euro U16 B)
1
Rain Veideman
U16 Estonia (Euro U16 B)
1
Dawit Villarzu
U16 Germany (Euro U16 B)
1
Vitali Yatsuk
U16 Belarus (Euro U16 B)
1