13. Qd1
+---+---+---+---+---+---+---+---+
8 | | .|bK |bR.| |bB.| |bR.|
+---+---+---+---+---+---+---+---+
7 | b.| b | .|bQ | .| b | b.| b |
+---+---+---+---+---+---+---+---+
6 | | .| | .| | .|bB | .|
+---+---+---+---+---+---+---+---+
5 | .| | b.| b | .| |wN.| |
+---+---+---+---+---+---+---+---+
4 | | .| |bN.| w | .| | .|
+---+---+---+---+---+---+---+---+
3 | .| | .| w | .| | w.| |
+---+---+---+---+---+---+---+---|
2 | w | w.| | .| | w.|wB | w.|