I know that Bobby Fischer had a 4 game advantage over Boris Spassky when they both completed their 21 World Championship Chess game matches to decides who will become the Chess Champion of the World in 1972.
bobby fischer - borris spasky
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Here's a link to MOST if not all of Fischer's games:
=> http://www.chessgames.com/perl/chessplayer?pid=19233
ADK
does anybody know how many games bobby fischer won against borris spasky