[Event "It (open)"] [Site "masterchessopen.com Griesheim (Germany)"] [Round "4"] [White "Koch Hans Juergen (GER)"] [Black "Mertes Christoph"] [Result "1-0"] [WhiteElo "2189"] [ECO "B10"] [Opening "Caro-Kann: 2.Nc3 d5"] 1.e4 c6 2.Nc3 d5 3.d4 dxe4 4.Nxe4 Nf6 5.Nxf6+ exf6 6.Bd3 Bd6 7.Qe2+ Be7 8.c3 O-O 9.Be3 Re8 10.Nf3 Bg4 11.h3 Bh5 12.O-O-O Qa5 13.b4 Qc7 14.g4 Bg6 15.Bxg6 fxg6 16.Qd2 a5 17.a3 axb4 18.axb4 Nd7 19.Qb2 Ra4 20.Qb3+ {#r} 1-0