Unknown player
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a
b
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Example
-
[#]
Black played
1.
...
f6
attacking the Knight. And now White has thedefensive retreat with
2.
Nf3
...
or
2.
Nd3
also works. Black plays
Rxe1+
3.
Nxe1
2.
...
Rxe1+
3.
Nxe1
with an equal endgame.