Black to play and mate in 4 (medium)
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Show moves
1...Qxb4+! 2.Bxb4 Rd2! 3.Qxd2 Nc2+ 4.Qxc2 axb4# 0-1
Games PGN
Created about 5 years ago. 
[Event "?"]
[Site "Finland"]
[Date "1968.??.??"]
[Round "?"]
[White "Koskinen"]
[Black "Kasanen"]
[Result "0-1"]
[FEN "kr1r4/7p/2bqp1p1/p7/1Pp1PP1P/K1B1nNPB/PP5R/RN2Q3 b - - 0 1"]
[SetUp "1"]

1...Qxb4+ $1 2.Bxb4 Rd2 $1 3.Qxd2 Nc2+ 4.Qxc2 axb4# 0-1