A schoolboy howler by goalkeeper Oliver Kahn cost Bayern Munich [ Images ] an almost certain victory as they drew 1-1 with Real Madrid [ Images ] in the glamour tie of the Champions League's [ Images ] first knockout phase.

Holders AC Milan [ Images ] also had to settle for a draw in a goalless first leg at Sparta Prague, but Lokomotiv Moscow [ Images ] held on for a 2-1 home win over Monaco.

The night will be one to forget for Germany [ Images ] captain Kahn after he allowed a long-range free kick by Real's Brazil [ Images ] wingback Roberto Carlos [ Images ] to slip under his body when he seemed to have the ball well under control.

Voted FIFA's [ Images ] player of the tournament at the 2002 World Cup, Kahn made his blunder with just seven minutes to go at the Olympic [ Images ] Stadium after Dutch striker Roy Makaay had headed the hosts into a well-deserved lead in the 75th minute.

The away goal means Real will now fancy their chances of reaching the quarter-finals when they face the Germans at the Bernabeu [ Images ] in a fortnight's time.

Milan will rue a couple of missed chances by their Ukrainian striker Andriy Shevchenko in Prague and can now ill-afford any defensive slips at the San Siro.

The away goals rule will keep Monaco's hopes up after their consolation strike by Fernando Morientes in a snow-swept game in Moscow, but will give little encouragement to Celta Vigo.