| Participant in the following personal tournaments: | Score | Medal |
| Balt Cup Vilnius Buitenland 2009 | 9 - 11 |  |
| Marinapark Volendam Invitatie Toernooi WDC 2008 | 7 - 8 |  |
| Doorwerth Invitation Tournament WDC 2007 | 7 - 7 | |
| Trainingsvierkamp Harm Wiersma Huizum 2005 | 6 - 10 |  |
| WC Blindfolddraughts Van Stigt Thans Schiedam 2005 , Blind | 16 - 9 | |
| Orap Open Dutch Championship KNDB 2001 | 9 - 19 | |
| Barrage Dutch Championship KNDB 2001 , Barrage | 24 - 25 | |
| Dutch Championship KNDB 2001 | 13 - 16 | |
| WC Blitz Tel Aviv Buitenland 2000 , Voorronde A | 19 - 24 | |
| European Championship KNDB 1999 | 15 - 23 | |
| WK Rapid KNDB 1999 | 22 - 24 | |
| Masters Leeuwarden Friesland 1998 , Algemeen | 4 - 4 | |
| Barrage 2 Nederlands Kampioenschap Algemeen KNDB 1998 | 2 - 3 | |
| Dutch Championship KNDB 1998 , Algemeen | 16 - 20 | |
| Breda City-Cup Noord-Brabant 1998 | 2 - 2 | |
| Masters Leeuwarden Friesland 1997 | 6 - 7 | |
| Willem Jurg Memorial Noord-Holland 1997 | 9 - 12 | |
| Worldchampionship Abidjan Buitenland 1996 , Groep E | 7 - 6 | |
| Match Wiersma - Valneris KNDB 1996 | 3 - 2 | |
| Barrages Qarterfinal Grandmasters Vlieland KNDB 1995 , Barrage 2 | 6 - 5 | |
| Quarterfinal Grandmasters Vlieland KNDB 1995 , Groep C | 6 - 6 | |
| Worldchampionship KNDB 1994 | 19 - 25 | |
| WC-match Chizhov - Wiersma KNDB 1994 | 20 - 18 | |
| Brunssum Limburg 1993 | 9 - 13 | |
| Dutch Championship KNDB 1993 | 12 - 15 | |
| Barrage Wch (place 2) Surhuisterveen KNDB 1993 | 6 - 7 | |
| Worldchampionship Toulon Buitenland 1992 | 23 - 31 | |
| Brunssum Limburg 1992 | 9 - 12 | |
| Dutch Championship KNDB 1992 | 13 - 18 | |
| Match Gantvarg - Wiersma Minsk Buitenland 1991 | 6 - 8 | |
| Match Valneris - Wiersma Riga Buitenland 1991 | 6 - 8 | |
| Kloksimultaan Harm Wiersma De Oldehove 1991 | 11 - 16 | |
| Clocksimultane Harm Wiersma - VAD Noord-Holland 1988 | 8 - 10 | |
| WC-match Wiersma-Virny Moskou/Netherlands Buitenland 1984 | 20 - 20 | |
| WC-match Wiersma - Van der Wal KNDB 1983 | 20 - 21 | |
| Volmac-trophy KNDB 1983 | 14 - 18 | |
| Worldchampionship Sao Paolo Buitenland 1982 | 13 - 18 | |
| WC-match Gantwarg - Wiersma KNDB 1981 | 20 - 22 | |
| Dutch Championship KNDB 1981 | 11 - 14 | |
| Worldchampionship Bamako Buitenland 1980 | 21 - 29 | |
| Match Wiersma - NDiaye KNDB 1980 | 10 - 14 | |
| Dutch Championship KNDB 1980 , Algemeen | 11 - 14 | |
| WC-match Wiersma - Gantwarg KNDB 1979 | 20 - 22 | |
| Match Wiersma - Kouperman Rijssen Overijssel 1979 | 5 - 5 | |
| Dutch Open Championship KNDB 1979 | 7 - 11 | |
| Alukon tournament Groningen 1979 | 5 - 7 | |
| Simultan Harm Wiersma Beauvais Frankrijk 1979 | 6 - 5 | |
| Dutch Championship KNDB 1979 | 13 - 18 | |
| Barrage WC Gantwarg - Wiersam Arco Buitenland 1979 | 6 - 5 | |
| Simultaneous Texel Oosterend 1979 | 52 - 100 | |
| Volmac quadrathlon Noord-Holland 1978 | 6 - 7 | |
| Worldchampionship Arco Buitenland 1978 , Finale | 11 - 15 | |
| Clock simultan Nice by Harm Wiersma Frankrijk 1978 | 6 - 11 | |
| Match Wiersma - Clerc Noord-Holland 1978 | 6 - 7 | |
| Sugartournament Noord-Holland 1977 | 11 - 15 | |
| Simultan Knokke by Harm Wiersma Belgie 1977 | 5 - 6 | |
| KSH-tournament Groningen 1977 , Finale | 11 - 16 | |
| Dutch Championship KNDB 1977 | 11 - 18 | |
| Sugartournament Noord-Holland 1976 , Groep A | 11 - 18 | |
| Clocksimultane Harm Wiersma KNDB 1976 | 15 - 22 | |
| Worldchampionship KNDB 1976 | 17 - 28 | |
| Dutch Championship KNDB 1976 | 11 - 17 | |
| Sugartournament Noord-Holland 1975 , Groep A | 11 - 17 | |
| KSH-tournament Groningen 1975 , Finale | 11 - 16 | |
| World Record Attempt Harm Wiersma KNDB 1975 | 10 - 12 | |
| IT Paramaribo NAKS Suriname 1975 | 4 - 8 | |
| Dutch Championship KNDB 1975 | 11 - 17 | |
| Sugartournament Noord-Holland 1974 , Finale | 11 - 18 | |
| Challenge Mondial Tblisi Buitenland 1974 | 10 - 17 | |
| Provincial Championship Friesland 1974 | 15 - 24 | |
| Heijtings tournament DV VBI Huissen 1974 , Hoofdklasse | 9 - 16 | |
| Lille Buitenland 1974 | 5 - 7 | |
| Dutch Championship KNDB 1974 | 11 - 17 | |
| Sugartournament Noord-Holland 1973 , Groep A | 11 - 14 | |
| Simultan Harm Wiersma Woluwe (Sint-Pierre) Belgie 1973 | 28 - 55 | |
| Provincial Championship Friesland 1973 | 13 - 24 | |
| KSH-tournament Groningen 1973 , Finale | 11 - 15 | |
| Dutch Championship KNDB 1973 | 13 - 21 | |
| Sugartournament Noord-Holland 1972 , Finale | 11 - 17 | |
| Worldchampionship KNDB 1972 | 16 - 25 | |
| Studentenkampioenschap van Nederland KNDB 1972 | 7 - 11 | |
| Dutch Championship KNDB 1972 | 11 - 19 | |
| Semi finals Dutch Championship KNDB 1972 , Groep A | 9 - 14 | |
| Provincial Championship Friesland 1971 | 13 - 23 | |
| KSH-tournament Groningen 1971 , Finale | 11 - 14 | |
| Dutch Championship KNDB 1971 | 11 - 11 | |
| Sugartournament Noord-Holland 1970 , Finale | 11 - 9 | |
| Provincial Championship Friesland 1970 , Finale | 10 - 15 | |
| Dutch Championship KNDB 1970 | 11 - 14 | |
| Sugartournament Noord-Holland 1969 , Finale | 9 - 13 | |
| Provincial Championship Friesland 1969 | 11 - 20 | |
| Brinta tournament Groningen 1969 , Finale | 11 - 15 | |
| Dutch Championship KNDB 1969 | 11 - 14 | |
| Provincial Championship Friesland 1968 | 11 - 18 | |
| Worldchampionship Bolzano Buitenland 1968 | 15 - 21 | |
| Trainingstournament Leeuwarden Friesland 1968 | 7 - 11 | |
| Provincial Championship Friesland 1967 | 11 - 17 | |
| Brinta-tournament Groningen 1967 , Finale | 11 - 10 | |
| Dutch Championship KNDB 1967 | 13 - 16 | |
| Turkstra-tournament Friesland 1966 | 9 - 8 | |
| Dutch Championship Juniors KNDB 1966 | 11 - 16 | |
| Provincial Youthchampionship Friesland 1966 | 2 - 3 | |
| Turkstra-tournament Friesland 1965 , Jeugdklasse A | 9 - 13 | |
| Brinta tournament Groningen 1965 , Jeugdklasse | 9 - 13 | |
| Hoogezand Youth Groningen 1964 | 5 - 5 | |
| Brinta-tournament Groningen 1964 , Jeugdklasse | 9 - 12 | |
