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.