During his professional
club career, Jamchi played with the Israeli clubs
Ironi Ramat Gan, from 1978 to 1985,
Maccabi Tel Aviv, where he first played from 1985 to 1996, and then later on, in 1999 to 2000 as well; and
Maccabi Rishon Le Zion, where he played from 1996 to 1999. In his pro club career, he won a total of 11
Israeli Premier League championships (1986, 1987, 1988, 1989, 1990, 1991, 1992, 1994, 1995, 1996, and 2000), and 7
Israeli State Cups (1986, 1987, 1989, 1990, 1991, 1994, and 2000). He was the
Israeli Premier League's top scorer a total of four times, in the years 1982, 1984, 1985, and 1999. He is the all-time career leading scorer in the history of all Israeli top-tier level basketball club competitions, the
Premier League, the
State Cup, and the
League Cup, with a total of 11,486 points scored. He is also the Israeli Premier League's
all-time leading scorer, having scored a total of 9,611 points, in 466 games played. He also holds the all-time career record for the most
3-point field goals made in the Israeli Premier League, with 815. He is all the all-time leading scorer in the club history of
Ironi Ramat Gan, with a total of 3,638 points scored, in 156 games played. While playing for Maccabi Tel Aviv, Jamchi played in a total of four
FIBA EuroLeague Final Fours, as he played at the
1988,
1989,
1991, and
2000 editions of the tournament. He was also a four-time
FIBA EuroLeague Finalist, in the
1987,
1988,
1989, and
2000 editions of the tournament. On an individual level, Jamchi was a four-time member of the
FIBA European Selection Team, in the years 1987, 1990, 1991, and 1995. Jamchi scored a total of 4,001 points in games played in European-wide competitions, as he competed in both the European 3rd-tier level
FIBA Korać Cup, and the European top-tier level
FIBA EuroLeague. In games played just in the top level EuroLeague, he scored a total of
3,087 points, in 175 games played. Jamchi scored a total of 15,487 points during his pro club career, across all competitions. ==National team career==