There is a four-way tie at the top of the BMW International Open in Cologne. Rafa Cabrera-Bello / Getty Images. Rafa had to be content with a share of the lead at -12 under par at the halfway point of the BMW International Open at Golf Club Gut Lärchenhof, after incurring a double hit penalty. He had been in the lead for most of the mornings play when he attempted to escape from to chip out of the rough in front of the green at the par five 7th hole. On the follow through he stuck the ball again, and carded a six, and had to share top spot with Emiliano Grillo, Pablo Larrazábal and Danny Willett. Danny Willett / Getty Images Danny had forgotten to take the pain killers for his sore shoulder, which lead to shank from him; " The only thing you can do is laugh as it is not something that happens very often." "Twelve under was great score for two days and the shoulder was good early on. I completely forgot to take any pills after nine holes and I could feel it in the last few holes." Emiliano Grillo is recovering from some tough times personally; "It's been a rough couple of months personally and on the golf course so I'm happy with the week so far. My dad passed away in December so it has been a long six months dealing with everything you have to deal with back home." "I've learned a lot of things about life with that and I think I am growing up fast." There are a group of six players that are the closest challengers to the leaders, all on -10 under par; they are Alex Cejka, Branden Grace, Andreas Hartø, Miguel Angel Jimenez, Robert Karlsson and Craig Lee. It was a special day for Andreas Hartø, as he made his first European Tour cut, after thirteen tournaments. Not so good for Martin Kaymer on his homecoming, he missed the cut, recoding a score of par for his two rounds, finishing at T102. What a strange game golf can be, on top of the world one day, and missing the cut the next. Martin was suffering from putting problems. He actually reached 17 of 18 greens in regulation but needed 35 putts to complete his round today, and recorded 31 in the first round. Martin Kaymer / Getty Images The BMW International Open leaderboard is pretty compacted, and with likes of Stenson and Jimenez lurking just behind the leaders I expect one of them to make a move tomorrow.