As a chess defense:
1. e4  e5
2.Nf3 Nf6

(end of turn 2, white to play)

  abcdefgh 
 +--------+
8|rnbqkb.r|8 (black)
7|pppp.ppp|7
6|.....n..|6
5|....p...|5
4|....P...|4
3|.....N..|3
2|PPPP.PPP|2
1|RNBQKB.R|1 (WHITE)
 +--------+
  abcdefgh

Historicaly:
Petroff, Alexander (1794-1867)
Russia's first master, theoretician, chess writer and chess composer.

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