The mainline Ruy Lopez usually avoids trade offs for quite awhile.
Just for curiosity...
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http://www.xs4all.nl/~timkr/records/records.htm
31 moves.
Nuber - Keckeisen
Mengen 1994
..for a decisive game.
Two others made it to move 70+ and were draws.
Apr 2, 2010
0
#6
oki it was that one , thanks, yep, no checks, no captures...
31 moves.
Nuber - Keckeisen
Mengen 1994
What has been the longest game between masters without any capture?
What openings allow you to keep mostly all the pieces over the board an search for complications?